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Home My WebLink About993077 CONDITIONAL LETTER OF MAP REVISION CLOMR SIEGRIST RIVER DANCE Weld County, Colorado December 1999 - yid County Planning Dept. JAN 18 2000 RECEIVED ltmttleApplegate,Inc. 5441 Boeing Dr., Suite 200 Loveland, CO 80538 _ EXHIBIT CaZ 4#5211 TABLE OF CONTENTS Introduction Site map Project Description FIRM Maps and Profiles Proposed floodplain revisions MT-2 Forms HECRAS Existing conditions Proposed conditions Disk Siegrist River Dance The project site is bounded to the south by the St. Vrain Creek, to the west by Interstate 25 frontage roads and to the north by Weld county Road 28. RiverDance is approximately 486 acres in size of which 227 acres will be dedicated as open space. The development provides a range of residential densities and a commercial area. The FEMA FIRM for Weld County, Colorado, Unincorporated Area(Community Panel 080266 0850 C, and 0855 C), dated September 1982, depicts an approximate Zone A floodplain along the St. Vrain in the vicinity of RiverDance. Through research, a 1977 Corps of Engineers "unpublished" study(only hydraulic modeling no report) was discovered. The Corps model represents a starting point; however, due to extensive mining in the area the model does not accurately portray St. Vrain Creek. Obtaining details about the model has proved difficult since it was never published and a report was not written. Therefore we have not used it as an existing condition model. Hydrologic Analysis The hydrology for this study was based on the discharges reported in the City of Longmont, Colorado FIS text dated September 18, 1987. As reported in the FIS the frequency discharge data for St. Vrain Creek was based on information published in the Corps of Engineers, Omaha District, Flood Plain Information, Lower St. Vrain, Volume III, Boulder County, Colorado, June 1972. The 100-year flood discharge is 16,520cfs. This is based on a log-Pearson type II analysis of peak runoff data recorded at gages on St. Vrain Creek near Lyons, and near Platteville, Colorado. The years of record vary from 79 years at the Lyons gage to 47 years at the Platteville gage. The related pages from the City of Longmont FIS text are included in Appendix A. Hydraulic Analysis The site is characterized by the fact that it is an old gravel-mining site. There are three pits and piles of product currently on the site. The pits have been reclaimed as lakes. As a result the hydraulic analysis of the area becomes extremely complicated because of lateral flow from the river to the lakes. To the north of St. Vrain Creek are two large lakes. A dirt road was built upon the berm separating the lakes and the river during the mining process. The road acts as a berm, however, we have modeled the river in a way that assumes the berm is not flood protection and could breach or overtop. There are low-lying areas where water flows from the river to the lakes and vice versa. This allows the lake areas and the river to have similar water surface elevations. Because the landscape has changed so drastically, it was desirable to reestablish the historic flow patterns observed in the overbanks. The Corps model was used as reference. The maximum flow in the left overbank in the area of the RiverDance site was selected. Once the maximum historic overbank flow was established, it was conservative to assume this flow would need to be conveyed through the overbank on the site. Encroachments were set so as to provide a somewhat constant conveyance on the left (north) overbank without raising the water surface elevation above what may have been observed historically. Because encroachments were set throughout the site, the sections provide extra carrying capacity should the overbank experience greater flood flows. IN this way the model represents a conservative, but accurate, water surface elevation throughout the site. Consequently, the flow in the main channel was representative of actual flow conditions. PROPOSED CONSTRUCTION The proposed construction for this site is on the left(north) bank of the lakes with the finished floors being above the base flood elevation. The left (north)bank of the lakes will be graded so it has a 4:1 slope up to the base flood elevation. The grading will be performed to complete the mining reclamation plan. The table below shows the effect of the proposed construction. Table 1: HECR4S results Cross Section Cross Section Pre-construction Post Construction Difference Letter Number WSEL (ft) WSEL (ft) (ft) 70609 4828.17 4828.17 0.00 G 69640 4823.90 4823.90 0.00 F 68595 4821.84 4821.84 0.00 E 67700 4819.45 4819.45 0.00 66525 4818.81 4818.81 0.00 C 65750 4818.25 4818.25 0.00 B 64715 4814.90 4814.90 0.00 A 63630 4814.00 4814.00 0.00 . Photo#3: Looking South East The photo shows the lakes in the foreground and the river in the background. Photo 2: Looking South The river can be seen in the background of the photo. The lake is the foreground This picture demonstrates the height of the road separating the river and the lake. «h, _2v twTp6 t: SRS r(y r Tr-tit Photo 1: Looking Upstream(West) The river is on the left side of the picture and the lakes are on the tight.. S`= i . f4,11 '. t , x'&" $fi Photo 2: Looking South The river can be seen in the background of the photo. The lake is in the foreground. 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M 09£9 Sheet bE No: 99T:I RI`�ER�A E ■YIN nApplegate,lnc. od. 11/le/to 3 D,..,,,: SIEORIST�: ,,,,wort..-ar.a Of: Clucked: D9c P O�CONDIIION� oes)152-44.1�IN.:(9w)..9-9299 5 FlN: 0NR-3 DATE BY CH D DESORPTION awl 1.19.1011.9.1 t?row+ +e9w $c W: I .TOO ' pEVIBIOM8 o IF ••• t L • _ .I A it I x e1 ii. / 1Il!Ai 2 � 26 � t li.111 1111 / , PROPERTY NAME OF PROPERTY OWNERS 1 Louwagie, Leroy J. ._ .<_ o x ; 2 Douthit, Glen S. .,., • EF �`r 2 3 JMII Investments, Inc. 4 ,� ,j 4 DeCino,Anthony A. £t Jury D. g � �� *� ` 4 g 5 Hamlin Gerald D. Et Kathryn J. 6,7 Vogl, Richard J &Margaret Trustees of e 8 Ridnour, Leland S. &Julee Jean ( ! ► � 9 Construction Leasing Investment Co. { - .�r�^ r, 36 1 10 Peters,James L. &Sharon t 11,13 Weld County(St.Vrain Land Co) k ' � ,,� 12 Roberts,John Et Joann r-- ,. ; 14 Colorado State of Div. Of Parks&Recreations d} ' , / w, '- 15 Anderson, Edwin £t Louise I ' `� = I o 17 First National Bank of Longmont Trustee-2/3 INT • `" I12 R 18 Martinez, Maclovio&Francisco&Fernando • 3 e H I 0'` , .,� 'e1 a � - 13 g f { /if it i 1_ 1 o �f •E _ K TI & 2 ice i fl � 3 r t . .04.0 . i il " /, t f tom; l� SCALE: 1" = 2000' a :, 1 a LL im Ns - I MEI INIIIIN It ID IN BM - MN N 2000 1500 1000 500 0 500 1000 2000 CONTOUR INTERVAL: 10 FEET S 5 I..,,f0., s p �q 11 ,lli . Y 1. 19I 1iii, r y. tl9lf Ilk•LllI, lffii * 1, %.6 ' , ,r:r, 4t IMF -,41I••; ..,,';:iil ;',Ff, •);., •••-• 1 Hr it t., op {A5 ' i j y' ,, 4' -,w<"-'tW Its,r#ii,*:,,w,, .1L"»w`vdt ,G`:'.�^.Fu4 -MR PW7 'i I ' .,„, i ..t,,, ii.,, 4.4 ' . ttwit gi. Cbl <nw. �.;: � L X11 � M ..V%...�... ,, aa i �Tt a.,., .....,,,,-...,,,,..) -, ,I\.,,,:, — am t \ ,.‘„, . I {. - A illi s 1 f ' , .... ..<„ ,. ..... ,, . if vvv, ,,,,,,i,x, _ \ I i . ,r lir,:,,,,,,,. „, .. ',.._ 'il ' 1 v • • \ d _ *— : :. <cz . 1,....\.. k ..,•,,,,,,. .. 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L 0 a ZONE C /—\ \.=11 it ._.._. APPROXIMATE SCALE 4y �_ :::' 1000 0 1000 FEET 5 3 ��. {` FEDERAL EMERGENCY MANAGEMENT AGENCY 0.M.8 No. 3067-0148 REVISION REQUESTER AND COMMUNITY OFFICIAL I Expires April 30, 2001 Public reporting burden for this form is estimated to average 2.13 hours per response. The burden estimate includes he time for reviewing instructions, searching existing data sources, gathering and maintaining the needed data, and completing and reviewing the form. Send comments regarding the accuracy of the burden estimate and any suggestions for reducing this burden to: Information Collections Management, Federal Emergency Management Agency, 500 C Street, S.W., Washington DC 20472; and to the Office of Management arid Budget, Paperwork Reduction Project (3067-0148), Washington, DC 20503. You are not required to respond to this collection of information unless a valid OMB Control Number is displayed in the upper right corner of this form. 1 . REQUESTED RESPONSE FROM FEMA This request is for a: ® CLOMR A letter from FEMA commenting on whether a proposed project., if built as proposed, would justify a map revision, or proposed hydrology changes (See 44 CFR Ch. 1, Parts 60,65 & 72). ❑ LOMR A letter from FEMA officially revising the current NFIP map to show the changes to floodplains, floodway or flood elevations. LOMRs typically decrease flood hazards. (See 44 CFR Ch. 1 Parts 60 & 65.) ❑ Other Describe: 2. OVERVIEW 1. The basis for this revision request is (are): (check all that apply) ❑ Physical Change ® Improved Methodology/Data 0 Floodway Revision Other Describe: Note: A photograph is not required, but is very helpful during review. 2. Flooding Source: St. Vrain Creek 3. Project Name/Identifier: Siegrist River Dance 4. FEMA zone designations affected: A (example: A, AH, AO, A1-A30, A99, AE, V, V1-V30, VE, B, C, D, X) 5. The NAP map panel(s) affected for all impacted communities is (are): Community No. Community Name State Map No. Panel No. Effective Date Ex: 480301 Katy, City TX 480301 0005D 02/08/83 480287 Harris County TX 48201 C 0220G 09/28/90 080266 Weld County CO 080266 0850C 09/28/82 080266 Weld County CO 080266 0855C 09/28/82 6. The area of revision encompasses the following types of flooding and structures. Check all that apply. - Types of Flooding Structures ® Riverine 0 Channelization ❑ Coastal 0 Levee/Floodwall ❑ Alluvial fan 0 Bridge/Culvert ❑ Shallow Flooding (e.g. Zones AO and AH) 0 Dam r] Lakes 0 Fill Other (describe) 0 Other describe) IPLEASE REFER TO THE INSTRUCTIONS FOR THE APPROPRIATE MAILING ADDRESS I FEMA Form 81-89 Revision Requester and Community Official Form MT-2 Form 1 Page 1 of 2 4. ENCROACHMENT INFORMATION I 1. Does the State have jurisdiction over the floodway or its adoption by communities participating in the NFIP? ❑ Yes 0 No If Yes, attach a copy of a letter notifying the appropriate State agency of the floodway revision and documentation of the approval of the revised floodway by the appropriate State agency. 2. Does the development in the floodway cause the 1% annual chance (base) elevation to increase at any location by more than 0.000 feet? ❑ Yes ❑ No ® N/A 3. Does the cumulative effect of all development that has occurred since the effective SFHA was originally identified cause the base flood elevation to increase at any location by more than one foot (or other increase limit if community or state has adopted more stringent criteria - even if a floodway has not been delineated by FEMA)? 0 Yes ® No If the answer to either items is Yes, please attach documentation that all requirements of Section 65.12 of the NAP regulations have been met, regarding evaluation of altematives, notice to individual legal property owners, concurrence of CEO, and certification that no insurable structures are impacted. 5. MAINTENANCE RESPONSIBILITY The community is willing to assume responsibility for ❑ performing ❑ overseeing compliance with the maintenance and operation plans of the (Name) flood control structure. If not performed promptly by an owner other than the community, the community will provide the necessary services without cost to the Federal government. Operation and maintenance plans are attached. ❑ Yes 0 No ® N/A 6. REVIEW FEE IThe review fee for the appropriate request category has been included. 121 Yes Fee amount: S3100 OR This request is based on a federally sponsored flood-control project where 50 percent or more of the project's cost is federally sponsored, or the request is based on detailed hydrologic and hydraulic studies conducted by Federal, State, or local agencies to replace approximate studies conducted by FEMA and shown on the effective FIRM; thus the project is fee exempt. 0 Yes Please see Instructions for Fee Amounts 7. SIGNATURE Note:I understand that my signature indicates that all information Note:Signature indicates that the community understands, from the submitted in support of this request is correct revision requester, the impacts of the revision on flooding conditions in the community. Signature of Revision Requester Signature of Community Official Mike Siegrist, President Printed Name and Title of Revision Requester Printed Name and Title of Community Official Siegrist Companies Company Name Community Name Telephone No.: 303-427-8472 Date: 12/04/99 Telephone No.: Date: CERTIFICATION BY REGISTERED PROFESSIONAL ENGINEER Check which forms have been included with this request AND/OR LAND SURVEYOR This certification is in accordance with 44 CFR Ch. 1, Sect 65.2 Form Name and (Number) Required if ® Hydrologic 13) new or revised discharges ® Hydraulic (4) new or revised water-surface elevations Signature ® Mapping (5) floodplain/floocway changes ❑ Channelization (6) channel is modified 'laniel Giroux, Associate Partner ❑ Bridge/Culvert (7) - addition/revision of bridge/culvert rinted Name and Title of Revision Requester ❑ Levee/Floodwall (8) addition/revision of levee/floodwall ❑ Coastal (9) new or revised coastal elevations Registr No. Expires (Date) State ❑ Coastal Structures (10) addition/revision of coastal structure ❑ Dam (11) addition/revision of darn Type of License/Expertise: ❑ Alluvial Fan 112) structures proposed on alluvial fan FEMA Form 81-89 Revision Requester and Community Official Form MT-2 Form 1 Page 2 of 2 FEDERAL EMERGENCY MANAGEMENT AGENCY I O.M.B No. 3067-0148 RIVERINE HYDRAULIC ANALYSIS Expires April 30, 2001 PUBLIC BURDEN DISCLOSURE NOTICE Public reporting burden for this form is estimated to average 2.25 hours per response. The burden estimate includes the time for viewing instructions, searching existing data sources, gathering and maintaining the needed data, and completing and reviewing the form. Send comments regarding the accuracy of the burden estimate and any suggestions for reducing this burden to: Information Collections Management, Federal Emergency Management Agency, 500 C Street, S.W., Washington DC 20472; and to the Office of Management and Budget, Paperwork Reduction Project (3067-0148), Washington, DC 20503. You are not required to respond to this collection of information unless a valid OMB Control Number is displayed in the upper right corner of this form. Note: Fill out one form for each flooding source studied Community Name: Weld County Flooding Source: St. Vrain Creek Project Name/Identifier: Siegrist RiverDance 1. REACH TO BE REVISED Describe the limits of the revision OR submit a copy of the FIRM with the revision area clearly highlighted. Copy of FIRM(s) attached depicting area of the revision (highlighted, or circled)? 0 Yes Downstream Limit: Upstream Limit: 1-25 Bridge 2. MODELS SUBMITTED Requirements: for areas which have detailed flooding: for areas which do not have detailed Full input and output listings along with files on diskette for each of the models flooding: listed below (items 1-4) and a summary of the source of input parameters used Only the 100-year (Base) flood profile is in the models must be provided. The summary must include a description of any required. A hydraulic model is not required changes made from model to model (e.g., Duplicate Effective model to for areas which do not have detailed Corrected Effective model). At a minimum, the Duplicate Effective (item 1) and flooding; however, BFEs may not be added to e Revised or Post-Project Conditions (item 4) models must be submitted. See the revised FIRM. If a hydraulic model is instructions for directions on when other models may be required. developed for the area, items 3 and 4 described below must be submitted. If hydraulic models are not developed, hydraulic analyses (including all calculations) for existing or pre-project conditions and revised or post-project conditions must be submitted. 1. Duplicate Effective Model 0 Natural File Name 0 Floodway Ale Name _ Copies of the hydraulic analysis used in the effective FIS, referred to as the effective models (10-, 50-, 100-, and 500-year multi-profile runs and the floodway run) must be obtained and then reproduced on the requester's equipment to produce the Duplicate Effective model. This is required to assure that the effective models input data has been transferred correctly to the requester's equipment and to assure that the revised data will be integrated into the effective data to provide a continuous FIS model upstream and downstream of the revised reach. 2. Corrected Effective Model 0 Natural Ale Name 0 Floodway File Name The Corrected Effective model is the model that corrects any errors that occur in the Duplicate Effective model, adds any additional cross sections to the Duplicate Effective model, or incorporates more detailed topographic information than that used in the currently effective model. The Correctly Effective model must not reflect any man-made physical changes since the date of the effective model. An error could be a technical error in the modeling procedures, or any construction in the floodplain that occurred prior to the date of the effective model but was not incorporated into the effective model. 3. Existing or Pre-Project Conditions Model ® Natural File Name Preconstruction 0 Floodway File Name The Duplicate Effective model or Corrective Effective model is modified to produce the Existing or Pre-Project Conditions model to reflect any modifications that have occurred within the floodplain since the' date of the Effective model but prior to the construction of the project for which the revision is being requested. If no modification has occurred since the date of the effective model, then this model would be identical to the Corrected Effective model or Duplicate Effective model. 4. Revised or Post-Project Conditions Model ® Natural File Name Post construction 0 Floodway File Name The Existing or Pre-Project Conditions model (or Duplicate Effective model or Corrected Effective model, as appropriate) is 4vised to reflect revised or post-project conditions. This model must incorporate any physical changes to the floodplain since the effective model was produced as well as the effects of the project. When the request is for the proposed project this model must reflect proposed conditions. 5. Other — Please attach a sheet describing all other models submitted along with the file names. 0 Natural 0 Floodway FEMA Form 81-89C Riverine Hydraulic Analysis Form MT-2 Form 4 Page 1 of 2 3. STARTING WATER-SURFACE ELEVATIONS IExplain how they were determined. Explanation Attached? ® Yes D No NOTE: If the effective study is an approximate study, the slope/area method is recommended. For detailed analysis studies, using a known water-surface elevation is recommended. 4. RESULTS (from the model used to revise the 100-year water surface elevations) If the results indicate any of the following, attach an explanation - to this form, or to the hydraulic model printout- as to the reasonableness of the situation. ❑ Supercritical depth ® Critical Depth ❑ Drawdowns ❑ Negative Floodway Surcharges ❑ Floodway Surcharges Greater Than Maximum Allowed by Community/State O Water surface elevations higher than the end points of cross sections. ❑ Floodway discharge is different than the Natural 100-year (base) flood discharge. O Project causes 100-year floodplain or floodway elevations to increase (state if increases are located off the requester's property) Explanation attached with Form 0 Explanation provided on attached printout O If Hydraulic model used is HEC-2. has it been checked with FEMA'S CHECK-2 computer program? O Yes O No (see instructions for information on how to obtain CHECK-2) 5. REVISED FIRM/FBFM AND FLOOD PROFILES 1. Profile Transition a. 100-Year Water-Surface Elevations - indicate the difference in water surface elevations where the project 100-year elevations tie into the existing 100-year water surface elevations at each end of the project. Downstream End within (feet) Upstream End within (feet) Cross-Section # Cross-Section # b. Floodway Elevations - indicate the difference in water surface elevations where the project floodway elevations tie into the existing floodway water surface elevations at each end of the project. Downstream End within (feet) Upstream End within (feet) Cross-Section # Cross-Section # c. Floodway widths - indicate the difference in floodway widths where the project floodway widths tie into the existing floodway width at each end of the project. Downstream End within (feet) Upstream End within (feet) Cross-Section # Cross Section # 2. Profile Checklist (check box if information has been provided on profile) The following information (unless in parentheses) must be included at the same scale as the existing profiles for this project: O Stream Name 0 Community Name O Corporate Limits labeled 0 Study limits labeled O Confluences labeled ® Channel Stationing 0 Streambed profiled ® Cross Sections labeled ® Horizontal/Vertical Scales indicated ® 100-year elevs profiled* ❑ Road Crossings O Labeled O Low Chord Elevations O Top of Road Elevations *All recurrence intervals in the effective study must also be profiled. Floodway Data Table Attach a Floodway Data Table for each cross section listed in the published Floodway Data table in the AS report. Floodway Data Table Attached O Yes ® Not Required Critical depth The HECRAS analysis shows critical depth occurs in a couple of cross sections. After field observations it is felt that this is due to the geometry of the cross sections. Therefore the HECRAS analysis is thought to be accurate. FEMA Form 81-89C Riverine Hydraulic Analysis Form MT-2 Form 4 Page 2 of 2 FEDERAL EMERGENCY MANAGEMENT AGENCY O.M.B No. 3067-0148 RIVERINE / COASTAL MAPPING Expires April 30, 2001 PUBLIC BURDEN DISCLOSURE NOTICE 'ublic reporting burden for this form is estimated to average 1.5 hours per response. The burden estimate includes the time for reviewing instructions, searching existing data sources, gathering and maintaining the needed data, and completing and reviewing the form. Send comments regarding the accuracy of the burden estimate and any suggestions for reducing this burden to: Information Collections Management, Federal Emergency Management Agency, 500 C Street, S.W., Washington DC 20472; and to the Office of Management and Budget, Paperwork Reduction Project (3067-0148), Washington, DC 20503. You are not required to respond to this collection of information unless a valid OMB Control Number is displayed in the upper right corner of this form. Note: Fill out one form for each flooding source studied Community Name: Weld County Flooding Source: St. Vrain Creek Project Name/Identifier: Siegrist RiverDance This is a ® Manual ❑ Digital submission. Digital map submissions may be used to update digital FIRMs (DFIRMs).. For updating DFIRMs, these submissions must be coordinated with FEMA Headquarters as far in advance as possible. 1. MAPPING CHANGES 1. A topographic workmap must be submitted showing the following information (check N/A when not applicable): a. Revised approximate 100-year floodplain boundaries (Zone A) ❑ Yes 0 No ❑ N/A b. Revised detailed 100- and 500-year floodplain boundaries. ® Yes ❑ No ❑ N/A c. Revised floodway boundaries O Yes ® No ❑ N/A d. Location and alignment of all cross sections with stationing control indicated. O Yes ® No O N/A . Stream alignments, road alignments and dam alignments. O Yes O No ® N/A Current community boundaries. ❑ Yes O No 0 N/A g. Effective 100- year floodplain and floodway boundaries from FIRM/FBFM reduced or enlarged to the scale of the topographic workmap ® Yes ❑ No ❑ N/A h. Tie-ins between the effective and revised 100-, 500-year and floodway boundaries ❑ Yes ❑ No ® N/A i. The requester's property boundaries and community easements ® Yes ❑ No ❑ N/A j. The signed certification of a registered professional engineer ® Yes O No ❑ N/A k. Location and description of reference marks O Yes ® No ❑ N/A I. Vertical datum (example: NGVD, NAVD) ® Yes O No ❑ N/A m. Coastal zone designations tie into adjacent areas not being revised O Yes O No 0 N/A n. Location and alignment of all coastal transects used to revise the coastal analyze O Yes O No ® N/A o. V-zone has been delineated to extend landward to the heel of the primary frontal dune O Yes O No ® N/A If any items are marked No or N/A please attach an explanation. 2. What is the source and date of the updated topographic information (example: orthophoto maps, July 1985: filed survey, May 1979, beach profile, June 1987 etc.)? photogrammetric topography 1998 3. What is the scale and contour interval of the following workmaps? Effective FIS Scale NA Contour Interval Revision Request Scale 1:500 Contour Interval 5 NOTE: Revised topographic information must be of equal or greater detail than effective. 4. Attach an annotated FIRM/FBFM at the scale of the effective FIRM/FBFM showing the revised 100- and 500-year floodplain mnd the floodway boundaries and how they tie into those shown on the effective FIRM/FBFM downstream and upstream of the :visions or adjacent to the area of revision for coastal studies. FIRM/FBFM attached? 0 Yes❑ No PLEASE REFER TO THE INSTRUCTIONS FOR THE APPROPRIATE MAILING ADDRESS FEMA Form 81-89D Riverine /Coastal Mapping Form MT-2 Form 5 Page 1 of 2 2. EARTH FILL PLACEMENT 1. The fill is: ® Existing 0 Proposed 2. Has fill been/will be placed in the regulatory floodway? 0 Yes ® No If Yes, please attach completed Riverine Hydraulic Analysis Form (Form 4). 3. Has fill been/will be placed in floodway fringe (area between the floodway and 100-year floodplain boundaries)? 0 Yes ® No If Yes, then complete A, B, C, and 0 below. a. Are fill slopes for granular materials steeper than one vertical on one-and-one-half horizontal? 0 Yes ❑ No If Yes, justify steeper slopes b. Is adequate erosion protection provided for fill slopes exposed to moving flood waters? (Slopes exposed to flows with velocities of up to 5 feet per second(fps) during the 100-year flood must, at a minimum, be protected by a cover of grass, vines, weeds, or similar vegetation; slopes exposed to flows with velocities greater than 5 fps during the 100-year flood must, at a minimum, be protected by stone or rock riprap.) 0 Yes 0 No If No, describe erosion protection provided c. Has all fill placed in revised 100-year floodplain been compacted to 95 percent of the maximum density obtainable with the Standard Proctor Test Method or acceptable equivalent method? 0 Yes ❑ No d. Can structures conceivably be constructed on the fill at any time in the future? ❑ Yes 0 No If Yes, attach certification of fill compaction (item 3c. above) by the community's NFIP permit official, a registered professional engineer, or an accredited soils engineer in accordance with Subparagraph 65.5(a)(6) of the NFIP regulations. Fill certification attached 0 Yes 0 No 4. Has fill been/will be placed in a V zone? ❑ Yes ® No If Yes, is the fill protected from erosion by a flood control structure such as a revetment or seawall? ❑ Yes ❑ No If Yes, attach the Coastal Structures Form (Form 10). FEMA Form 81-89D Riverine/Coastal Mapping Form MT-2 Form 5 Page 2 of 2 Hydrology The hydrology was based on the City of Longmont, Colorado FIS text dated September 18, 1987. The 100-year discharge is reported as 16,520 cfs for the Saint Vrain Creek. A„ / I , d FLOOD - - -7-Nie ` ...,.,..„ INSURANCE- rfrk • air , - STUDY 4— - , sai p- ,Th 460. ;tali-a-twit , /7 i - )1/2"Teicatat - [ - /Iklitikh, ill j CITY OF LONGMONT, COLORADO BOULDER COUNTY SEPTEMBER 18, 1987 eft 1 Federal Emergency Management Agency COMMUNITY NUMBER •080027 Various structural improvements such as grass- or concrete-lined channels, detention ponds, and outfall culverts have been imple mented on Spring Gulch in the segment from 9th Avenue to 3rd Ave- c nue. These improvements are inadequate to contain even the 10- year flood discharge. No flood protection measures have been taken on Dry Creek, No. 1 or in Loomiller Basin, except for using Loomiller Pond as a flood- storage facility. Various properties along the streets in Loomillet Basin have low retaining walls along the street frontage to prevent yard flooding. In addition to the physical flood prevention measures mentioned, the City of Longmont initiated an ordinance in May of 1973 for flood plain regulation and has followed with flood plain manage- ment policies outlined in the St. Vrain Comprehensive Plan (Refer- 1 ence 5) . 3.0 ENGINEERING METHODS For the flooding sources studied in detail in the community, standard hydrologic and hydraulic study methods were used to determine the flood hazard data required for this study. Flood events of a magnitude which • are expected to be equaled or exceeded once on the average during any 10-, 50-, 100-, or 500-year period (recurrence interval) have been selec- ted as having special significance for flood plain management and for flood insurance rates. These events, commonly termed the 10-, 50-, 100-, and 500-year floods, have a 10, 2, 1, and 0.2 percent chance, re-spec- tively, of being equaled or exceeded during any year. Although the re- currence interval represents the long-term average period between floods of a specific magnitude, rare floods could occur at short intervals or even within the same year. The risk of experiencing a rare flood increa- ses when periods greater than 1 year are considered. For example, the risk of having a flood which equals or exceeds the 100-year flood (1 percent chance of annual exceedence) in any 50-year period is approxi- mately 40 percent (4 in 10) , and, for any 90-year period, the risk in- creases to approximately 60 percent (6 in 10) . The analyses reported herein reflect flooding potentials based on conditions existing in the community at the time of completion of this study. Maps and flood eleva- tions will be amended periodically to reflect future changes. 3.1 Hydrologic Analyses Hydrologic analyses were carried out to establish the peak dis- charge-frequency relationships for floods of the selected recurr- ence intervals for each stream studied in detail in the community. Frequency-discharge data for two of the streams studied in detail in the City of Longmont are based on information published in COE Flood Plain Information reports for Lefthand and St. Vrain Creeks 12 r (References 7 and 8, respectively) . The 100-year flood discharges on Lefthand Creek and St. Vrain Creek are 4,250 cfs and 10,200 cfs, respectively. The 500-year flood discharges for these two streams equal the discharges for the standard project floods as published in the Flood Plain Information reports (References 7 and 8) . These relationships are based on a log-Pearson Type III analysis of peak runoff data recorded at gages on St. Vrain Creek near Lyons and near Platteville, Colorado (Reference 13) . The years of record_vary from 79 years at the Lyons gage to 47 years r at the Platteville gage. Discharge-frequency relationships for Dry Creek No. 1 and Spring Gulch were computed using the COE HEC-1 Flood Hydrograph Package (Reference 14) . Synthetic flood hydrographs computed by this method reflect the effects of characteristics of the basin: pre- cipitation, ground cover, slope, drainage area, and other physical characteristics of the drainage basin. Where available, hydro- logic data were compared with other studies completed in the area (References 15 and 16) . The effects of detention storage near State Highway 66 and at Long Peak Dam on Spring Gulch were studied (Reference 15) and found to be insignificant for the magnitude of the floods considered in this study. That portion of the Spring Gulch Basin located north and east of Terry Lake is considered to be contained completely by Terry Lake. The major portion of the Dry Creek No. 1 Basin is located outside the limits of the study area. Runoff from this area contributing to peak discharges within the study reach is limited by the Colo- rado and Southern Railroad, which diverts most of the upstream runoff north to St. Vrain Creek. Rainfall data for the synthetic hydrologic analysis were taken from a rainfall/runoff information report (Reference 17) . The discharges computed using the HEC-1 program were verified using the Plains Region equations developed by the USGS (Reference 18) . Peak discharges were also verified by the U.S. Soil Conservation Service (SCS) runoff prediction method (Reference 19) . Discharges for the 500-year floods of all streams were checked by straight-line extrapolation of frequencies previously determined using the procedure of the USGS (References 9 and 10) , and com- pared to the COE Standard Project Flood data when available. The hydrologic analyses for this study were revised to include information presented in flood plain information reports for Left- hand Creek, Dry Creek No. 1, and St. Vrain Creek (References 1-4) . Peak discharge-drainage area relationships for Dry Creek No. 1, St. Vrain Creek, Lefthand Creek, and Spring Gulch are shown in Table 1. 13 Table 1. Summary of Discharges Drainage Area Peak Discharges (cfs) Flooding Source arid Location (Square Miles) 10-Year 50-Year 100-Year 500-Year Dry Creek No. 1 Above Confluence With Steele Lakes Tributary --1 271 674 987 1,872 Above Confluence With Clover Basin Tributary --1 568 1,268 1,726 3,112 Below State Highway 119 --1 260 330 350 415 Lefthand Creek At Mouth 72 520 2,480 4,610 10,320 St. Vrain Creek (Vicinity of Longmont) At Mouth 924 5,350 12,120 16,520 40,080 I-. ul Spring Gulch At Mouth --1 1,950 3,150 3,650 4, 200 1Data Not Available Hydraulic Model HECRAS Geometric File The geometric data for this model was obtained from an aerial photogrammetric topographic survey performed in 1998. In the area where updated topography was not available we used the information from the 1977 Corps of Engineers unpublished study of the St. Vrain River. This was primarily the south overbank area. The mannings a throughout the model is 0.07 in the overbanks and 0.04 in the channel. Colorado State Department of Transportation (CDOT)is rebuilding and enlarging the I- 25 and frontage road bridges over the St. Vrain River. The data related to these bridges and associated drop structure was not incorporated into our model due to a lack of available information regarding the details of the project. Additionally the CDOT project datum was unclear as well as the project being in metric units. After numerous attempts to include the partial CDOT data in our model it was determined that it was better to leave the CDOT project out. Significantly, CDOT reported no increases in the water surface elevation. This seems reasonable with the bridge enlargements proposed. Additionally, the CDOT improvements are in effect upstream of our subject site on a subcritical, or downstream control, river reach. These factors led us to the conclusions that the CDOT bridge and drop structure improvements did not pose adverse impacts to the BFE's and were therefore not significant to modeling of our subject site. The geometric files in this model are complicated by the fact that we are trying to model two-dimensional flow in a one-dimensional model. The river and the lakes are separated by an access road that was put in during the mining operation. This road acts as a berm however; it has not been certified as a flood-protecting levee. Therefore, we modeled the berm so it could be breached or overtopped. Low-lying areas between the river and the lakes allow flow to travel between the two. Flow Data The discharge was taken from the City of Longmont Flood Insurance Study which showed the 100-year discharge of the St. Vrain Creek 16,520 cfs. The peak flow is reduced downstream as per the Corps 1977 model, which is in conformance with the cited hydrologic reference. Boundary Conditions The starting water surface elevation was calculated using the slope area method with normal depth at the downstream end having a slope of 0.001. Existing Conditions HEC — 2 Model Siegrist Riveruance TA#99-122 Existing Condtions 11-09-99 By:KES Check: Siegrist prj.—Post Construction HEC-RAS September 1998 Version 2.2 U.S. Army Corp of Engineers Hydrologic Engineering Center 609 Second Street, Suite D Davis, California 95616-4687 (916) 756-1104 X X XXXXXX XXXX XXXX XX XXXX X x X X X x X X X X X X X X XXXXX XXXXXXX XXXX X XXX XXXX XXXXXX XXXX X X X X X X X X X X X X X X XXXX X X X XXXXXX XXXX X X X X XXXXX PROJECT DATA Project Title: Siegrist Project File : siegrist.prj Run Date and Time: 12/8/99 9:34:30 AM Project in English units Project Description: 1000 4861.17 1032.6 4858.76 1104.32 4853.16 1174.81 4846.11 1281.59 4838.84 1604.78 4832.09 1905.57 4828.84 2154.97 4818 2211.29 4818 2236.68 4818 226 0.32 4818 2321.43 4818 2344.25 4818 2383.81 4818 2465.36 4818 2481.95 4818 2625.15 4818 2637.94 4818 2641.93 4818 Page 1 of 17 Siegrist Riveraance TA#99-122 99-122 Existing Condtions 11-09-99 By:KES Check: Siegrist prj.-Post Construction 2689.49 4818 2706.5 4818 2721.63 48 18 2747.71 4818 2769.98 4818 2786.58 4818 2769.56 4818 2801.6 4818 2807.58 4825.84 2814.78 4825.83 2891.03 4826.1 2914.8 4826.84 2939.15 4826.52 2951 .59 4825.84 2960.23 4819.84 3028.41 4816.1 3038.49 4816.1 3058.29 4816.1 30 78.62 4816.1 3085.11 4816.1 3108.46 4816.1 3124.514816.1 3136.82 4816.1 31 47.56 4816.1 3157.57 4819.84 3160.01 4820.96 3171.08 4822.84 3200.86 4825.44 3219.53 4825.84 3316.36 4825.39 3362.59 4825.06 3380.89 4825 3412.9 4824.8 4 3453.68 4825.12 3466 4821.3 3594 4821.9 3610 4819.5 3646 46i9.S 3660 482 0.4 3697 4822.1 3842 4822.1 3882 4823.5 3896 4820.5 4063 4820.6 Page 2 of 17 Siegrist Rive,uance TA#99-122 99-122 Existing Condtions 11-09-99 ByKES Check: Siegrist prj.—Post Construction 4225 4820. 6 4392 4820.6 4570 4820.6 4606 4825.9 4659 4823.9 4755 4823.9 4943 4824.8 4955 4621.8 4963 4821.8 4971 4823 5188 4828.4 5335 4830 5405 4830.3 5563 4831.9 5742 4833.7 ST. VRAIN CREEK WELD COUNTY COLORADO ST. VRAIN CREEK 100 YEAR FLOOD THIS FILE MODIFIES ORIGINAL TO RUN WITH STANDARD HEC-2 OMAHA DISTRICT BRIDGE ROUTINE (BPR) CONVERTED TO SPECIAL BRIDGE OR NORMAL BRIDGE 97-058-SVC-352 T1 039 Page 3of17 Siegrist Riveivance TA#99-122 Existing Condtions 11-09-99 By:KES Check: Siegrist prj.—Post Construction ST. VRAIN CREEK T2 040 CHANNEL IMPROVEMENTS FINAL DESIGN CHANNEL AND DROP T3 041 PLAN DATA Plan Title: Post Construction Siegrist Plan File : a:\siegrist.p15 Geometry Title: post construction siegrist Geometry File : a:\siegrist.gll Flow Title : Normal Depth Flow File . a:\siegrist.f03 Plan Summary Information: Number of: Cross Sections = 8 Mulitple Openings - 0 Culverts = 0 Inline Weirs = 0 Bridges = 0 Computational Information Water surface calculation tolerance = 0.01 Critical depth calculaton tolerance = 0.01 Maximum number of interations = 20 Maximum difference tolerance = 0.3 Flow tolerance factor = 0.001 Computation Options Critical depth computed only where necessary Conveyance Calculation Method: At breaks in n values only Friction Slope Method: Average Conveyance Computational Flow Regime: Subcritical Flow Encroachment Data Equal Conveyance�a __ ____ LefL offset - G Right Offset = 0 River = st vrain Reach = siegrist RS Profile Method Valuel Value2 70609 PF 2 1 2210 69640 PF 2 1 2180 Page 4 of 17 Siegrist Riveroance TA#99-122 Existing Condtions 11-09-99 ByKES Check: Siegrist prj. —Post Construction 68595 PF 2 1 2290 67700 PF 2 1 2480 65750 PF 2 1 1900 63630 PF 2 1 1742.77 FLOW DATA Flow Title: Normal Depth Flow File : a:\siegrist.f03 Flow Data Icfs) River Reach RS PF 1 PF 2 st vrain siegrist 70609 16500 16500 st vrain siegrist 69640 16500 16500 st vrain siegrist 68595 16500 16500 st vrain siegrist 67700 16450 16450 at vrain siegrist 66525 16400 16400 st vrain siegrist 65750 16400 16400 st vrain siegrist 64715 16400 16400 st vrain siegrist 63630 16400 16400 st vrain siegrist 62755 16350 16350 Boundary Conditions River Reach Profile Upstream Downstream st vrain siegrist PF 1 Normal S = .001 Normal S = .001 st vrain siegrist PF 2 Normal S = .001 Normal S = .001 GEOMETRY DATA Geometry Title: post construction siegrist Geometry File : a:\siegrist.gll CROSS SECTION RIVER: st vrain REACH: siegrist RS: 70609 INPUT Description: DS Bridge ICON xsec 50 and corps xsec Station Elevation Data num= 87 Sta Elev Sta Elev Sta Elev Sta Elev Sta Elev 1000 4876.06 1048.01 4872.94 1082.22 4869.94 1112.1 4867.94 1137.9 4866.72 1207.35 4864.94 1244.59 4863.4 1306.3 4861.47 1339.33 4859.34 1357.53 4857.28 1366.82 4855.46 1383.16 4853.25 1405.45 4850.95 1430.13 4848.67 1458.16 4846.55 Page 5 of 17 Siegrist Riveluance TA#99-122 Existing Condtions 11-09-99 ByKES Check: Siegrist prj.-Post Construction 1493.21 4843.94 1526.02 4841.49 1551.59 4840.05 1583.61 4837.94 1622.2 4835.49 1662.78 4833.72 1725.91 4832.3 1806.11 4830.58 1841.67 4828.94 1873.66 4827.26 1918.39 4825.3 2083.55 4818 2145.91 4818 2179.62 4818 2190.4 4818 2201.53 4818 2340.8 4818 2362.73 4818 2472.97 4818 2482.17 4818 2545.46 4818 2598.48 4818 2612.89 4618 2653.43 4818 2673.07 4818 2717.89 4818 2729.21 4826.42 2742.03 4626.62 2746.88 4826.94 2752.94 4827.24 2755.12 4827.47 2765.55 4829.83 2779.51 4832.29 2832.65 4832.76 2887.61 4831.72 2909.19 4831.94 2927.43 4629.17 2935.45 4828.62 2956.17 4828.21 2981.15 4824.21 2984.13 4821.52 3058.72 4820.87 3081 4820.87 3105.86 4820.87 3132.18 4822.21 3142.11 4823.8 3151.17 4828.21 3163.18 4826.94 3175.72 4827.55 3190.74 4827.8 3197.37 4827.77 3306 4825.5 3451 4825.5 3628 4825.6 3762 4825 3780 4825 3914 4824.7 3934 4821.8 3954 4821.8 3972 4825.2 4105 4827.1 4129 4827.1 4336 4627.2 4469 4827.5 4597 4826.8 4757 4827.8 4766 4823.5 4782 4823.5 4807 4828.1 4945 4828.9 5096 4830 5292 4831.5 Manning's n Values num= 3 Sta n Val Sta n Val Sta n Val 1000 .3 2956.17 .3 3151.17 .3 Bank Sta: Left Right Lengths: Left Channel Right Coeff Contr. Expan. 2956.17 3151.17 1315.26 1330.01 1321.48 .1 .3 Ineffective Flow num= 2 Sta L Ste R Elev Sta L Sta R Elev 1000 2965.17 4870 3142.17 5292 4870 CROSS SECTION OUTPUT Profile 8PF 2 E.G. Elev (ft) 4831.37 Element Left OB Channel Right OB Vel Head (ft) 3.20 Wt. n-Val. 0.300 W.S. Elev (ft) 4628.17 Reach Len. (ft) 1315.26 1330.01 1321.48 Crit W.S. (ft). 4828.17 Flow Area (sq ft) 1149.14 E.G. Slope (ft/ft) 0.701226 Area (sq ft) 5270.85 1174.64 3284.77 Q Total (cfs) 16500.00 Flow (cfs) 16500.00 Top Width (ft) 2410.47 Top Width (ft) 548.21 194.67 1667.59 Vel Total (ft/s) 14.36 Avg. Vel. (ft/s) 14.36 Max Chl Dpth (ft) 10.17 Hydr. Depth (ft) 6.49 Cony. Total (cfs) 19704.0 Conv. (cfs) 19704.0 Length Wtd. (ft) 1326.00 Wetted Per. (ft) 178.41 Min Ch El (ft) 4820.87 Shear (lb/sq ft) 281.98 Alpha 1.00 Stream Power (lb/ft s) 4048.75 Frctn Loss (ft) 3.59 Cum Volume (acre-ft) 497.85 233.18 441.14 C & E Loss (ft) 0.93 Cum SA (acres) 98.34 42.54 193.26 Warning: The energy equation could not be balanced within the specified number of iterations. The program used critical depth for the water surface and continued on with the calculations. Warning: Divided flow computed for this cross-section. Warning: The velocity head has changed by more than 0.5 ft (0.15 m) . This may indicate the need for additional cross sections. Warning: The conveyance ratio (upstream conveyance divided by downstream conveyance) is less than 0.7 or greater than 1 .4. This may indicate the need for additional cross sections. Page 6 of I7 Siegrist Riveraance TA L#99-122 99-122 Existing Condtions 11-09-99 By:KES Check: Siegrist prj.—Post Construction Warning: The energy loss was greater than 1.0 ft (0.3 m) . between the current and previous cross section. This may indicate the need for additional cross sections. Warning: During the standard step iterations, when the assumed water surface was set equal to critical depth, the calculated water surface came back below critical depth. This indicates that there is not a valid subcritical answer. The program defaulted to critical depth. CROSS SECTION RIVER: st vrain REACH: siegrist RS: 69640 INPUT Description: SV-38 Station Elevation Data num= 78 Ste Elev Ste Elev Sta Elev Sta Elev Ste Eiev 1000 4824 1032.6 4824 1104.32 4824 1174.81 4824 1281.59 4824 1604.78 4824 2130.97 4824 2154.97 4618 2211.29 4818 2236.68 4818 2260.32 4818 2321.43 4818 2344.25 4818 2383.81 4818 2465.36 4818 2481.95 4818 2625.15 4818 2637.94 4818 2641.93 4818 2689.49 4818 2706.5 4818 2721.63 4818 2747.71 4818 2769.98 4818 2786.58 4818 2789.56 4818 2801.6 4818 2807.58 4824.94 2814.78 4824.93 2891.03 4825.2 2914.8 4825.94 2939.15 4825.62 2951.59 4824.94 2960.23 4818.94 3028.41 4815.2 3038.49 4815.2 3058.29 4815.2 3078.62 4815.2 3085.11 4815.2 3108.46 4815.2 3124.51 4815.2 3136.82 4815.2 3147.56 4815.2 3157.57 4818.94 3160.01 4820.06 3171.08 4821.94 3200.86 4824.54 3219.53 4824.94 3316.36 4824.49 3362.59 4824.16 3380.89 4824.1 3412.9 4823.94 3453.68 4824.22 3466 4821.3 3594 4821.9 3610 4819.5 3646 4819.5 3660 4820.4 3697 4822.1 3842 4822.1 3882 4823.5 3896 4820.5 4063 4820.6 4225 4820.6 4392 4820.6 4570 4820.6 4606 4825.9 4659 4823.9 4755 4823.9 4943 4824.8 4955 4821.8 4963 4821.8 4971 4823 5188 4828.4 5335 4830 5405 4830.3 5563 4831.9 5742 4833.7 Manning's n Values num= 3 Ste n Val Ste n Val Sta n Val 1000 .07 2914.8 .04 3219.53 .07 Bank Sta: Left Right Lengths: Left Channel Right Coeff Contr. Expan. 2914.8 3219.53 950 1045 1215 .1 .3 CROSS SECTION OUTPUT Profile 1PF 2 E.G. Elev (ft) 4824.00 Element Left OB Channel Right OB Vel Head (ft) 0.10 Wt. n-Val. 0.070 0.040 0.070 W.S. Elev (ft) 4823.90 Reach Len. (ft) 950.00 1045.00 1215.00 Crit W.S. (ft) Flow Area (sq ft) 3682.68 1653.26 3327.11 E.G. Slope (ft/ft) 0.000722 Area (sq ft) 3682.68 1653.26 3327.11 O Total (cts) 16500.00 Flow (cfs) 6777.46 5920.05 3802.49 Top Width (ft) 2161.22 Top Width (ft) 626.68 240.45 1294.09 Vel Total (ft/s) 1.90 Avg. Vel. (ft/s) 1.84 3.58 1.14 Maw Chl Dpth (ft) 8.70 Hydr. Depth (ft) 5.88 6.88 2.57 Conv. Total (cfs) 614149.1 Conv. (cfs) 252264.8 220351.2 141533.1 Length Wtd. (ft) 1030.72 Wetted Per. (ft) 635.29 243.27 1295.58 Min Ch El (ft) 4815.20 Shear (lb/sq ft) 0.26 0.31 0.12 Alpha 1.73 Stream Power (1b/ft s) 0.48 1.10 0.13 Page 7 of 17 Siegrist Riveluance TA#99-122 Existing Condtions 11-09-99 By:KES Check: Siegrist pd.—Post Construction Frctn Loss (ft) 1.58 Cum Volume (acre-ft) 362.68 190.01 340.85 C & E Loss (ft) 0.04 Cum SA (acres) 80.60 35.90 148.34 Warning: Divided flow computed for this cross-section. Warning: The conveyance ratio (upstream conveyance divided by downstream conveyance) is less than 0.7 or greater than 1.4. This may indicate the need for additional cross sections. Warning: The energy loss was greater than 1.0 ft (0.3 m) . between the current and previous cross section. This may indicate the need for additional cross sections. CROSS SECTION RIVER: st vrain REACH: siegrist RS: 68595 INPUT Description: SV-37 Station Elevation Data num= 63 Sta Elev Sta Elev Sta Elev Sta Elev Sta Elev 1349.28 4821.84 1369.23 4821.84 1421.27 4821.84 1443.97 4821.84 1483.68 4821.84 1523.08 4821.84 1550.29 4821.84 1576.02 4821.84 1609.16 4821.84 1624.52 4818.2 1654.95 4817.94 2780.93 4817.94 2801.01 4817.94 2815.62 4817.94 2829.45 4818.94 2845.73 4822.39 2870.83 4824.94 2920.6 4823.94 2959.3 4821.94 2973.16 4818.44 2984.61 4817.6 3012.48 4813.4 3105.91 4817.94 3122.31 4820.94 3130.83 4824.27 3144.14 4822.94 3158.8 4822.98 3182.12 4823.08 3224.61 4822.67 3268.48 4821.91 3333.96 4821.7 3408.77 4821.78 3475.02 4821.77 3539.65 4821.88 3611.88 4821.43 3622.22 4821.4 3636.78 4821.94 3805 4821.2 4005 4820.6 4149 4820.3 4172 4818.7 4205 4820.5 4404 4822 4499 4819.8 4586 4820 4602 4821.1 4653 4821.2 4667 4820.3 4688 4822.4 4804 4821.7 4842 4821.8 4894 4825.4 4909 4823 4917 4821.8 4933 4821.8 4941 4825.5 5003 4827.6 5205 4829.3 5405 4830.7 5605 4831 5805 4831.2 6005 4831.6 6205 4833.6 Manning's n Values num= 3 Sta n Val Sta n Val Sta n Val 1349.28 .07 2870.83 .04 3130.83 .07 Bank Sta: Left Right Lengths: Left Channel Right Coeff Contr. Expan. 2870.83 3130.83 865 875 925 .1 .3 CROSS SECTION OUTPUT Profile #PF 2 E.O. Elev (ft) 4822.37 Element Left OB Channel Right OB Vel Head (ft) 0.53 Wt. n-Val. 0.070 0.040 0.070 W.S. Elev (ft) 4821.84 Reach Len. (ft) 865.00 875.00 925.00 Crit W.S. (ft) Flow Area (sq ft) 2117.81 860.49 1068.09 E.G. ope (ft/ft) 0.005 48 Area (sq t) 2111.81 660.49 1068.09 Q Total (cfs) 16500.00 Flow (cfs) 7929.85 6928.89 1641.26 Top Width (ft) 2107.84 Top Width (ft) 553.14 164.93 1389.77 Vel Total (it/s) 4.08 Avg. Vet. (ft/s) 3.74 8.05 1.54 Max Chl Dpth (ft) 8.44 Hydr. Depth (ft) 3.83 5.22 0.77 Conv. Total (cfs) 227766.7 Cony. (cfs) 109464.0 95646.6 22656.1 T.ength Wtd. (ft) 882.23 Wetted Per. (ft) 557.38 166.25 1390.07 Min Ch El (ft) 4813.40 Shear (1b/sq ft) 1 .24 1.70 0.25 Page 8of17 Siegrist Riverdance TA#99-122 Existing Condtions 11-09-99 By:KES Check: Siegrist prj.—Post Construction Alpha 2.06 Stream Power (1b/ft s) 4.66 13.65 0.39 Frctn Loss (ft) 2.66 Cum Volume (acre-ft) 299.43 159.86 279.55 C 5 E Loss (ft) 0.12 Cum SA (acres) 67.73 31.04 110.91 Warning: Divided flow computed for this cross-section. Warning: The conveyance ratio (upstream conveyance divided by downstream conveyance) is less than 0.7 or greater than 1.4. This may indicate the need for additional cross sections. Warning: The energy loss was greater than 1.0 ft (0.3 m) . between the current and previous cross section. This may indicate the need for additional cross sections. CROSS SECTION RIVER: st vrain REACH: siegrist RS: 67700 INPUT Description: SV-36 Station Elevation Data num= 64 Sta E1ev Ste Elev Sta Clay Sta Elev Ste Elev 1451.45 4819.46 1499.64 4819.46 1542.39 4819.46 1620.63 4619.46 1749.62 4819.46 1784.14 4819.46 1803.67 4819.46 1814 4819.46 1832.13 4819.46 1847.95 4819.46 1869.79 4812.94 1879.09 4812.94 2024.41 4812.94 2047.22 4814.88 2056.43 4812.94 2294.31 4812.94 2314.14 4812.94 2327.69 4813.73 2344.65 4813.26 2356.78 4812.94 2372.15 4812.94 2832.1 4812.94 2846.46 4812.94 2855.58 4816.37 2866.65 4819.42 2919.04 4822.94 2929.3 4819.94 2938.55 4817.25 3036.49 4811.7 3054.58 4821.94 3131.54 4820.94 3150.95 4820.3 3161.4 4819.94 3173.87 4818.08 3232.96 4814.13 3538.9 4814.94 3559.85 4816.94 3576.16 4818.22 3589.21 4818.98 3612.38 4819.94 3645.97 4819.92 3687.6 4818.94 3708.44 4817.2 3716.14 4814.94 3819.54 4814.13 3945 4820.2 4145 4816.7 4179 4819.2 4193 4818.2 4240 4820 4347 4822.2 4546 4821.3 4601 4824.2 4619 4825 4635 4820.6 4651 4820.6 4677 4825 4701 4824.5 4746 4826.1 4946 4827.4 5145 4828.3 5346 4629.1 5546 4829.7 5747 4830.2 Manning's n Values num= 3 Sta n Val Sta n Val Sta n Val 1451.45 .07 2919.04 .04 3054.58 .07 Bank Sta: Left Right Lengths: Left Channel Right Coeff Contr. Expan. 2919.04 3054.58 1160 1175 1075 .1 .3 CROSS SECTION OUTPUT Profile #PF 2 E.G. Elev (ft) 4819.60 Element Left OB Channel Right OB Vel Head (ft) 0.15 Wt. n-Val. 0.070 0.040 0.070 W.S. Elev (ft) 4819.45 Reach Len. (ft) 1160.00 1175.00 1075.00 DLit W.S. (ft) Flow Area (sq ft) 2446.14 548.46 2770.73 E.G. Slope (ft/ft) 0.001949 Area (sq ft) 2446.14 548.46 2770.73 0 Total (cfs) 16450.00 Flow (cfs) 7734.82 2453.93 6261.25 Top Width (ft) 1385.99 Top Width (ft) 387.08 119.19 879.72 Vel Total (ft/s) 2.85 Avg. Vel. (ft/s) 3.16 4.47 2.26 Max Chl Dpth (ft) 7.75 Hydr. Depth (ft) 6.32 4.60 3.15 Cony. Total (cis) 372641.1 Cony. (cfs) 175216.5 55588.7 141835.9 Length Wtd. (ft) 1128.45 wetted Per. (ft) 394.62 121.70 880.73 Page 9 of 17 Siegrist Rive,ounce TA#99-122 Existing Condtions 11-09-99 By:KES Check: Siegrist prj.—Post Construction Min Ch El (ft) 4811.70 Shear (lb/sq ft) 0.75 0.55 0.38 Alpha 1.18 Stream Power (lb/ft s) 2.38 2.45 0.86 Frctn Loss (ft) 0.73 Cum Volume (acre-ft) 254.11 145.70 238.79 C 6 E Loss (ft) 0.04 Cum SA (acres) 58.40 28.18 86.81 warning: Divided flow computed for this cross-section. Warning: The conveyance ratio (upstream conveyance divided by downstream conveyance) is less than 0.7 or greater than 1.4. This may indicate the need for additional cross sections. CROSS SECTION RIVER: st vrain REACH: siegrist RS: 66525 INPUT Description: SV-35 Station Elevation Data num= 64 Sta Elev Sta Elev Sta Elev Sta Elev Sta Elev 1423.15 4818.81 1441.22 4818.81 1461.64 4818.81 1472.36 4818.81 1489.77 4818.81 1492.77 4618.81 1512.01 4814.74 1520.68 4812.94 1539.6 4812.94 2447.33 4812.94 2457.1 4812.94 2468 4814.85 2482.24 4817.94 2499.72 4821.03 2513.58 4821.22 2536.1 4820.42 2540.86 4820.46 2590.19 4820.4 2608.76 4821.17 2618.15 4818.61 2627.57 4813.75 2643.82 4812.83 2653.84 4812.78 2696.24 4810.4 2757.89 4811.94 2802.4 4814.28 2861.97 4819.98 2915.62 4819.11 2991.65 4819.11 3061.25 4819.5 3131.77 4819.01 3151.72 4817.94 3162.23 4812.94 3165.3 4812.51 4023.26 4812.51 4031.67 4812.79 4033.84 4816.65 4139 4821.4 4163 4825.6 4183 4820.1 4196 4820.1 4213 4823.7 4389 4825.2 4578 4826.2 4586 4825.3 4593 4826.2 4786 4826.4 4987 4827.3 5142 4828.8 5168 4828.8 5176 4826.3 5187 4828.2 5193 4827.5 5200 4829.1 5210 4826.2 5388 4827 5502 4828.2 5511 4827.5 5519 4828.2 5590 4828.3 5788 4828.5 5990 4828.9 6191 4828.9 6326 4829.7 Manning's n Values num= 3 Sta n Val Sta n Val Sta n Val 1423.15 .07 2608.76 .04 2861.97 .07 Bank Sta: Left Right Lengths: Left Channel Right Coeff Contr. Expan. 2608.76 2861.97 720 775 830 .1 .3 CROSS SECTION OUTPUT Profile #PF 2 E.G. Elev (ft) 4818.84 Element Left OB Channel Right OB Vel Head (ft) 0.03 Wt. n-Val. 0.070 0.040 0.070 W.S. Elev (ft) 4818.81 Reach Len. (ft) 720.00 775.00 830.00 Crit W.S. (ft) Flow Area (sq ft) 5665.36 1311.92 5575.20 E.G. Slope (ft/ft) 0.Annai6 Area q ft) 5665.36 1311.92 Q Total (cral 16400.00 Flow (cis) 6815.66 2735. /1 6848.63 Top Width (ft) 2172.64 Top Width (ft) 994.35 232.27 946.01 Vel Total (ft/s) 1.31 Avg. Vel. (ft/s) 1.20 2.09 1.23 Max Chl Dpth (ft) 8.41 Hydr. Depth (ft) 5.70 5.65 5.89 Conv. Total (cfs) 922374.2 Contr. (cfs) 383328.8 153862.5 385182.8 Length Wtd. (ft) 767.42 Wetted Per. (ft) 995.54 233.87 949.50 Min Ch El (ft) 4810.40 Shear (lb/sq ft) 0.11 0.11 0.12 Page 10 of 17 Siegrist Riveivance TA#99-122 Existing Condtions 11-09-99 ByKES Check: Siegrist prj.—Post Construction Alpha 1.15 Stream Power (1b/ft s) 0.14 0.23 0.14 Frctn Loss (ft) 0.43 Cum Volume (acre-ft) 146.11 120.61 135.81 C & E Loss (ft) 0.01 Cum SA (acres) 40.01 23.44 64.28 Warning: Divided flow computed for this cross-section. Warning: The conveyance ratio (upstream conveyance divided by downstream conveyance) is less than 0.7 or greater than 1.4. This may indicate the need for additional cross sections. CROSS SECTION RIVER: st vrain REACH: siegrist RS: 65750 INPUT Description: SV-34 Station Elevation Data num= 62 Sta Elev Sta Elev Ste Elev Sta Elev Sta Elev 1510.57 4818.26 1522.34 4818.26 1543.91 4818.26 1564.36 4818.26 1572.48 4818.26 1582.4 4818.26 1586.23 4818.26 1603.27 4812.94 1720.78 4812.94 1849.54 4812.94 1911.66 4812.94 1921.48 4812.94 2455.35 4812.94 2466.42 4812.94 2479.28 4812.94 2495.14 4814.58 2504.97 4816.94 2509.89 4817.94 2519.59 4819.01 2562.13 4816.94 2590.94 4813.42 2622.56 4813.19 2685.87 4812.21 2779.15 4809.8 2874.96 4814.47 2932.75 4814.68 3038.78 4817.77 3234.9 4817.02 3430.24 4816.42 3553.75 4816.29 3646 4815.9 3749.21 4815.94 3805.24 4815.77 3911.42 4816.93 4005.85 4818.32 4166.63 4821.94 4243 4821.8 4444 4821.9 4497 4823.5 4507 4817.9 4527 4817.9 4544 4823.2 4555 4821.7 4646 4821.7 4845 4821.9 4927 4822 4948 4821.2 4964 4824.3 5004 4823.7 5048 4824 5246 4825.5 5381 4825.8 5395 4827 5405 4824.3 5419 4826.3 5444 4826.3 5457 4824.3 5471 4825.3 5646 4826.2 5844 4826.4 6043 4827.4 6250 4827 Manning's n Values num= 3 Sta n Val Sta n Val Sta n Val 1510.57 .07 2590.94 .04 2874.96 .07 Bank Sta: Left Right Lengths; Left Channel Right Coeff Contr. Expan. 2590.94 2874.96 920 1035 980 .1 .3 CROSS SECTION OUTPUT Profile #PF 2 E.G. Elev (ft) 4818.40 Element Left OB Channel Right OB Vel Head (ft) 0.16 Wt. n-Val. 0.070 0.040 0.070 W.S. Elev (ft) 4818.24 Reach Len. (ft) 920.00 1035.00 980.00 Crit W.S. (ft) Flow Area (sq ft) 3275.35 1766.53 1957.62 E.G. Slope (ft/ft) 0.001143 Area (sq ft) 3275.35 1766.53 1957.62 Q Total (cfs) 16400.00 a Flow (cfs) 7499.98 2021.84 Top Width (ft) 2099.30 Top Width (ft) 668.13 284.02 1147.15 Vel Total (ft/s) 2.34 Avg. vel. (ft/s) 2.10 4.25 1.03 Max Chl Dpth (ft) 8.44 Hydr. Depth (ft) 4.90 6.22 1.71 Conv. Total (cfs) 485136.0 Conv. (cfs) 203466.6 221860.3 59809.1 Length Wtd. (ft) 981.22 Wetted Per. (ft) 674.16 284.17 1147.35 Min Ch El (ft) 4809.80 Shear (1b/sq it) 0.35 0.44 0.12 Alpha 1.86 Stream Power (16/ft s) 0.73 1.88 0.13 Page !) of 17 Siegrist Riveruance T/O499-122 Existing Condtions 11-09-99 By:KES Check: Siegrist prj.—Post Construction Frctn Loss (ft) 2.62 Cum Volume (acre-ft) 72.22 93.23 64.04 C 6 E Loss (ft) 0.06 Cum SA (acres) 26.27 18.85 44.34 Warning: Divided flow computed for this cross-section. Warning: The velocity head has changed by more than 0.5 ft (0.15 m) . This may indicate the need for additional cross sections. Warning: The conveyance ratio (upstream conveyance divided by downstream conveyance) is less than 0.7 or greater than 1.4. This may indicate the need for additional cross sections. Warning: The energy loss was greater than 1.0 ft (0.3 m) . between the current and previous cross section. This may indicate the need for additional cross sections. CROSS SECTION RIVER: st vrain REACH: siegrist RS: 64715 INPUT Description: SV-33 Station Elevation Data num= 57 Sta Elev Ste Elev Ste Elev Sta Elev Sta Elev 1177.09 4814.97 1191.87 4814.97 1231.4 4814.97 1245.08 4814.97 1264.11 4814.97 1269.51 4813.62 1290.27 4812.94 1322.41 4812.94 2092.5 4812.94 2104.59 4813.31 2119.12 4816.63 2134.39 4819.07 2166.67 4816.94 2177.25 4810.94 2238.77 4808.9 2267.08 4809.92 2301.1 4810.94 2337.13 4813.86 2360.98 4814.92 2368.78 4814.88 2430.17 4814.76 2521.38 4815.32 2607.02 4814.94 2613 4814.3 2630 4813.9 2831 4813.8 2994 4813.6 3017 4809.5 3036 4809.5 3065 4813.2 3231 4813.8 3430 4814.6 3629 4815.5 3832 4815.8 3998 4816.8 4005 4816 4010 4816.8 4030 4816.8 4067 4815.8 4082 4816.6 4230 4819.6 4291 4820.4 4302 4823 4316 4817 4324 4817 4348 4823 4394 4821.5 4432 4821.9 4575 4823.5 4629 4823.5 4829 4823.5 5029 4823.9 5229 4824.5 5302 4825.3 5319 4826.1 5326 4823.4 5337 4826.2 Manning's n Values num= 3 Sea n Val Sta n Val Ste n Val 1177.09 .07 2134.39 .04 2360.98 .07 Bank Sta: Left Right Lengths: Left Channel Right Coeff Contr. Expan. 2134.39 2360.98 1055 1085 1040 .1 .3 CROSS SECTION OUTPUT Profile SPF 2 E.G. Elev (ft) 4815.72 Element Left OB Channel Right OB Vel Head (ft) 0.79 Wt. n-Val. 0.070 0.040 0.070 W.S. Elev (ft) 4814.93 Reach Len. )ft) 1055.00 1085.00 1040.00 :Jill W.S. (ft) 4814.83 Flow Area (sq ft) 10`59.81 735.23 1120.10 E.G. Slope (ft/ft) 0.012075 Area (sq £t) 1659.81 735.23 1120.10 Q Total (cfs) 16400.00 Flow (cfs) 6059.29 7345.32 2995.39 Top Width (ft) 2030.01 Top Width (ft) 847.39 190.76 991.86 vel Total (ft/s) 4.67 Avg. Vel. (ft/s) 3.65 9.99 2.67 Max Chl Dpth (ft) 6.03 Hydr. Depth (ft) 1.96 3.85 1.13 Conv. Total (cfs) 149247.2 Conv. (cfs) 55142.2 66845.6 27259.3 Length Wed. (ft) 1073.44 Wetted Per. (ft) 847.75 192.02 992.50 Page 12 of 17 Siegrist Riveraance TA#99-122 99-122 Existing Condtions 11-09-99 BOLES Check: Siegrist prj.—Post Construction Min Ch El (ft) 4808.90 Shear (lb/sq ft( 1.48 2.89 0.85 Alpha 2.34 Stream Power (lb/ft s) 5.39 28.84 2.28 Frctn Loss (ft) 2.59 Cum Volume (acre-ft) 20.10 63.51 29.42 C & E Loss (ft) 0.19 Cum SA (acres) 10.26 13.21 20.28 Warning: Divided flow computed for this cross-section. Warning: The velocity head has changed by more than 0.5 ft (0.15 m) . This may indicate the need for additional cross sections. Warning: The conveyance ratio (upstream conveyance divided by downstream conveyance) is less than 0.7 or greater than 1.4. This may indicate the need for additional cross sections. Warning: The energy loss was greater than 1.0 ft (0.3 m) . between the current and previous cross section,. This may indicate the need for additional cross sections. CROSS SECTION RIVER: st vrain REACH: siegrist RS: 63630 INPUT Description: SV-32 Station Elevation Data num= 68 Sta Elev Sta Elev Sta Elev Sta Elev Sta Elev 1269.29 4825.94 1297 4823.7 1341.69 4821.72 1381.69 4819.27 1408.54 4816.94 1448.4 4815.53 1484.82 4816.26 1510.52 4813.02 1553.44 4809.94 1725.56 4809.94 1742.77 4813.73 1766.87 4812.21 1768.6 4811.56 1785.06 4807.94 1829.9 4807.57 1856.83 4807.57 1907.41 4807.57 1953.5 4807.57 2003.12 4807.57 2039.3 4807.57 2067.92 4807.57 2105.95 4807.57 2142.82 4807.57 2172.91 4807.57 2257.6 4807.57 2313.17 4807.57 2347.61 4807.57 2365.93 4807.57 2411.05 4807.57 2444.93 4807.57 2457.45 4807.57 2473.77 4807.57 2488 4807.57 2597.36 4807.57 2627.87 4811.97 2639.59 4810.61 2657.73 4807.57 2739.27 4807.57 2751.49 4810.3 2773.26 4810.95 2794.65 4811.45 2828.8 4811.94 2880.11 4611.72 2891 4811.2 2959 4811.7 3159 4811.2 3318 4811.3 3377 4816.5 3559 4816.2 3759 4816.5 3934 4816.9 3942 4819.4 3950 4817 3958 4818.2 3985 4818.2 3997 4817.4 4008 4818.4 4159 4819.4 4221 4819.2 4238 4820.5 4255 4815.8 4265 4815.8 4287 4820.3 4361 4819.8 4560 4820.2 4761 4820.6 4869 4820.8 4898 4823.4 Manning's n Values num= 3 Ste n Val Sta n Val Sta n Val 1269.29 .07 1742.77 .04 2627.87 .07 Bank Sta: Left Right Lengths: Left Channel Right Coeff Contr. Expan. 1742.77 2627.87 825 875 805 .1 .3 CROSS SECTION OUTPUT Profile #PF 2 E.G. Elev (ft) 4812.94 Element Left OB Channel Right OB Vel Head (ft) 0.17 Wt. n-Val . 0.040 0.070 W.S. Elev (ft) 4812.77 Reach Len. (ft) Crit W.S. (ft) 4809.78 Flow Area (sq ft) 4364.05 1344.55 E.G. Slope (ft/ft) 0.001000 Area (sq ft) 4364.05 1344.55 Q Total (cfsl 16400.00 Flow (cfs) 15015.19 1384.81 Top Width (ft) 1576.78 Top Width (ft) 869.93 706.85 Page 13 of 17 Siegrist Riveruance TA#99-122 Existing Condtions 11-09-99 By:KES Check: Siegrist prj.—Post Construction Vel Total (ft/s) 2.87 Avg. Vel . (ft/s) 3.44 1.03 Max Chl Dpth (ft) 5.20 Hydr. Depth (ft) 5.02 1.90 corn/. Total (c£s) 518551.9 Conv. (cfs) 474765.6 43786.3 Length Wtd. (ft) Wetted Per. (ft) 870.78 707.58 Min Ch El (ft) 4807.57 Shear (lb/sq ft) 0.31 0.12 Alpha 1.32 Stream Power (lb/ft s) 1.08 0.12 Frctn Loss (ft) Cum Volume (acre-ft) C & E Loss (ft) Cum SA (acres) SUMMARY OF MANNING'S N VALUES River:st vrain Reach River Sta. nl n2 n3 siegrist 70609 .3 .3 .3 siegrist 69640 .07 .04 .07 siegrist 68595 .07 .04 .07 siegrist 67700 .07 .04 .07 siegrist 66525 .07 .04 .07 siegrist 65750 .07 .04 .07 siegrist 64715 .07 .04 .07 siegrist 63630 .07 .04 .07 SUMMARY OF REACH LENGTHS River: st vrain Reach River Sta. Left Channel Right siegrist 70609 1315.26 1330.01 1321.48 siegrist 69640 950 1045 1215 siegrist 68595 865 875 925 siegrist 67700 1160 1175 1075 siegrist 66525 720 775 830 siegrist 65750 920 1035 980 siegrist 64715 1055 1085 1040 siegrist 63630 825 875 805 SUMMARY OF CONTRACTION AND EXPANSION COEFFICIENTS River: st vrain Page 14 of i7 Siegrist Rivewance TA#99-122 99-122 Existing Condtions 11-09-99 BY:KES Check: Siegrist prj.—Post Construction Reach River Sta. Contr. Expan. siegrist 70609 .1 .3 siegrist 69640 .1 .3 siegrist 68595 .1 .3 siegrist 67700 .1 .3 siegrist 66525 .1 .3 siegrist 65750 .1 .3 siegrist 64715 .1 .3 siegrist 63630 .1 .3 Profile Output Table - CHECKRAS Reach River Sta Froude # Chl Top Wdth Act Conv. Total Prof Delta WS Left Sta Eff Enc Sta L Center Station Enc Sta R Rght Sta Eff Min Ch El Left Stagn Right Stagn (ft) (cfs) (ft) (ft) (ft) (ft) (ft) (ft) (ft) (ft) (ft) siegrist 70609 0.99 177.00 19704.0 0.00 2965.17 2210.00 3053.67 3142.17 4820.87 siegrist 69640 0.24 2161.22 614149.1 0.65 2180.00 2180.00 3067.17 5007.18 4815.20 siegrist 68595 0.62 2107.84 227766.7 1.51 2290.00 2290.00 3000.83 4933.09 4813.40 siegrist 67700 0.37 1385.99 372641.1 0.37 2480.00 2480.00 2986.81 4225.60 4811.70 siegrist 66525 0.15 2172.64 922374.2 0.30 1492.79 2735.36 4081.58 4810.40 siegrist 65750 0.30 2099.30 485136.0 0.25 1900.00 1900.00 2732.95 4528.09 4809.80 siegrist 64715 0.90 2030.01 149247.2 0.10 1264.28 2247.69 3502.45 4808.90 siegrist 63630 0.27 1576.78 518551.9 0.11 1757.94 1742.77 2185.32 3334.72 4807.57 Profile Output Table - Standard Table 1 Reach River Sta Q Total Min Ch El W.S. E1ev Crit W.S. E.G. E1ev E.G. Slope Vel Chnl Flow Area Top Width Froude # Chl (cfs) (ft) (ft) (ft) (ft) (ft/ft) (ft/s) (sq ft) (ft) siegrist 70609 16500.00 4820.87 4828.17 4828.17 4831.37 0.701226 14.36 1149.14 2410.47 0.99 siegrist 69640 16500.00 4815.20 4823.90 4824.00 0.000722 3.58 8663.05 2161.22 0.24 8595 .a egr .. v 16500.00 u .i.iu 4821.84 4822.37 0.005248 4046.39 2107.84 0.62 r �s' � d OS siegrist 67700 16450.00 4811.7u 4819.45 4819.60 0.001949 4.47 5765.33 1385.99 0.37 siegrist 66525 16400.00 4810.40 4818.81 4818.84 0.000316 2.09 12552.48 2172.64 0.15 siegrist 65750 16400.00 4809.80 4818.24 4818.40 0.001143 4.25 6999.49 2099.30 0.30 siegrist 64715 16400.00 4808.90 4814.93 4814.83 4815.72 0.012075 9.99 3515.15 2030.01 0.90 siegrist 63630 16400.00 4807.57 4812.77 4809.78 4812.94 0.001000 3.44 5708.60 1576.78 0.27 Page 15 of 17 Siegrist Riveruance TA#99-122 Existing Condtions 11-09-99 By:KES Check: Siegrist pg.—Post Construction Profile Output Table - Standard Table 2 Reach River Sta E.G. Elev W.S. E1ev Vel Head Frctn Loss C & E Loss Q Left Q Channel Q Right Top Width (ft) (ft) (ft) (ft) (ft) (cfs) (cfs) (cfs) (ft) siegrist 70609 4831.37 4628.17 3.20 3.59 0.93 16500.00 2410.47 siegrist 69640 4824.00 4823.90 0.10 1.58 0.04 6777.46 5920.05 3802.49 2161.22 siegrist 68595 4822.37 4821.84 0.53 2.66 0.12 7929.85 6926.69 1641.26 2107.84 siegrist 67700 4819.60 4819.45 0.15 0.73 0.04 7734.82 2453.93 6261.25 1385.99 siegrist 66525 4818.84 4818.81 0.03 0.43 0.01 6615.66 2735.71 6848.63 2172.64 siegrist 65750 4818.40 4818.24 0.16 2.62 0.06 6878.18 7499.98 2021.84 2099.30 siegrist 64715 4815.72 4814.93 0.79 2.59 0.19 6059.29 7345.32 2995.39 2030.01 siegrist 63630 4812.94 4812.77 0.17 15015.19 1384.81 1576.76 ERRORS WARNINGS AND NOTES Errors Warnings and Notes for Plan : post constr River: at vrain Reach: siegrist RS: 70609 Profile: PF 2 Warning:The energy equation could not be balanced within the specified number of iterations. The program used critical depth for the water surface and continued on with the calculations. Warning:Divided flow computed for this cross-section. Warning:The velocity head has changed by more than 0.5 ft (0.15 m) . This may indicate the need for additional cross sections. Warning:The conveyance ratio (upstream conveyance divided by downstream conveyance) is less than 0.7 or greater than 1.4. This may indicate the need for additional cross sections. Warning:The energy loss was greater than 1.0 ft (0.3 m) . between the current and previous cross section. This may indicate the need for additional cross sections. Warning:During the standard step iterations, when the assumed water surface was set equal to critical depth, the calculated water surface came back below critical depth. This indicates that there is not a valid subcritical answer. The program defaulted to critical depth. River: st vrain Reach: siegrist RS: 69640 Profile: PF 2 Warning:Divided flow computed for this cross-section. Warning:The conveyance ratio (upstream conveyance divided by downstream conveyance) is less than 0.7 or greater than 1.4. This may indicate the need for additional cross sections. Warning:The energy loss was greater than 1.0 ft (0.3 m) . between the current and previous cross section. This may indicate the need for additional cross sections. River: st vrain Reach: siegrist RS: 68595 Profile: PF 2 Warning:Divided flow computed for this cross-section. warning:The conveyance ratio (upstream conveyance divided by downstream conveyance) is less than 0.7 or greater than 1.4. This may indicate the need for additional cross sections. Warning:The energy loss was greater than 1.0 ft (0.3 m) . between the current and previous cross section. This may indicate the need for additional cross sections. .Rivcr. st vrain srcgr 67700 Profile: PF 2 warning:Divided slow computed for this cross-section. Warning:The conveyance ratio (upstream conveyance divided by downstream conveyance) is less than 0.7 or greater than 1.4. This may indicate the need for additional cross sections. River: st vrain Reach: siegrist RS: 66525 Profile: PF 2 Warning:Divided flow computed for this cross-section. Warning:The conveyance ratio (upstream conveyance divided by downstream conveyance) is less than 0.7 or greater than 1.4. This may indicate the need for additional cross sections. Page 16 of 17 Siegrist Riveruance 17.0.11 99-122 Existing Condtions 11-09-99 ByKES Check: Siegrist prj.—Post Construction River: st vrain Reach: siegrist RS: 65750 Profile: PF 2 Warning:Divided flow computed for this cross-section. Warning:The velocity head has changed by more than 0.5 ft (0.15 m) . This may indicate the need for additional cross sections. Warning:The conveyance ratio (upstream conveyance divided by downstream conveyance) is less than 0.7 or greater than 1.4. This may indicate the need for additional cross sections. Warning:The energy loss was greater than 1.0 ft (0.3 m) . between the current and previous cross section. This may indicate the need for additional cross sections. River: at vrain Reach: siegrist RS: 64715 Profile: PF 2 Warning:Divided flow computed for this cross-section. Warning:The velocity head has changed by more than 0.5 ft (0.15 m) . This may indicate the need for additional cross sections. Warning:The conveyance ratio (upstream conveyance divided by downstream conveyance) is less than 0.7 or greater than 1.4. This may indicate the need for additional cross sections. Warning:The energy loss was greater than. 1.0 ft (0.3 m) . between the current and previous cross section. This may indicate the need for additional cross sections. • Page 17 of 17 Post Construction HEC — 2 Model Siegrist Rive7,...nce TA#99-122 Post Project 11-09-99 BY ICES Check; Siegrist prj. Post Construction HEC-RAS September 1998 Version 2.2 U.S. Army Corp of Engineers Hydrologic Engineering Center 609 Second Street, Suite D Davis, California 95616-4687 (916) 756-1104 X X XXXXXX XXXX XXXX XX XXXX X X X X X X X X X X X X X X X X X X X XXXXXxx XXXX X XXX XXXX XXXXXX. XXXX X X X X X X X X X X X X X x XXXX X X X XXXXXX XXXX X X X X XXXXX PROJECT DATA Project Title: Siegrist Project File : siegrist.prj Run Date and Time: 12/8/99 9:51:48 AM Project in English units Project Description: 1000 4861.17 1032.6 4858.76 1104.32 4853.16 1174.81 4846.11 1281.59 4838.84 1604.78 4832.09 1905.57 4828.84 2154.97 4818 2211.29 4818 2236.68 4818 226 0.32 4818 2321.43 4818 2344.25 4818 2383.81 4818 2465.364818 2481.95 4818 2625.15 4818 2637.94 4818 2641.93 4818 Page I of 17 Siegrist Rives.. sce TA#99-122 Post Project 11-09-99 By: ICES Check: Siegrist prj. Post Construction 2689.49 4818 2706.5 4818 2721.63 48 18 2747.71 4818 2769.98 4818 2786.58 4818 2789.56 4818 2801.6 4818 2807.58 4825.84 2814.78 4825.83 2891.03 4826.1 2914.8 4826.84 2939.15 4826.52 2951 .59 4825.84 2960.23 4819.84 3028.41 4816.1 3038.49 4816.1 3058.29 4816.1 30 78.62 4816.1 3085.11 4816.1 3108.46 4816.1 3124.51 4816.1 3136.82 4816.1 31 47.56 4816.1 3157.57 4819.84 3160.01 4820.96 3171.08 4822.84 3200.86 4825.44 3219.53 4825.84 3316.36 4825.39 3362.59 4825.06 3380.89 4825 3412.9 4824.8 4 3453.68 4625.12 3466 4821.3 3594 4821.9 3610 4819.5 4819.°. 3660 482 0.4 3697 4822.1 3842 4822.1 3882 4823.5 3896 4620.5 4063 4820.6 Page 2 of 17 Siegrist Riveruance TA#99-122 Post Project 11-09-99 BY: ICES Check: Siegrist prj. Post Construction 4225 4820. 6 4392 4820.6 4570 4820.6 4606 4825.9 4659 4823.9 4755 4823.9 4943 4824.8 4955 4821.8 4963 4821.8 4971 4823 5188 4828.4 5335 4830 5405 4830.3 5563 4831.9 5742 4833.7 ST. VRAIN CREEK WELD COUNTY COLORADO ST. VRAIN CREEK 100 YEAR FLOOD THIS FILE MODIFIES ORIGINAL TO RUN WITH STANDARD HEC-2 OMAHA DISTRICT BRIDGE ROUTINE (BPR) CONVERTED TO SPECIAL BRIDGE OR NORMAL BRIDGE m7B 97-058-SVC-352 T1 039 Page 3 of 17 Siegrist Riveroance TA#99-122 Post Project 11-09-99 BY ICES Check: Siegrist prj. Post Construction ST. VRAIN CREEK T2 040 CHANNEL IMPROVEMENTS FINAL DESIGN CHANNEL AND DROP T3 041 PLAN DATA Plan Title: Pre construction Plan File : a:\siegrist.p27 Geometry Title: Pre-construction. Geometry File : a:\siegrist.g12 Flow Title : Normal Depth Flow File : a:\siegrist.f03 Plan Summary Information: Number of: Cross Sections = 8 Mulitple Openings = 0 Culverts = 0 Inline Weirs = 0 Bridges = 0 Computational Information Water surface calculation tolerance = 0.01 Critical depth calculaton tolerance = 0.01 Maximum number of interations = 20 Maximum difference tolerance = 0.3 Flow tolerance factor = 0.001 Computation Options Critical depth computed only where necessary Conveyance Calculation Method: At breaks in n values only Friction Slope Method: Average Conveyance Computational Flow Regime: Subcritical Flow Encroachment Data Equal Conveyance = True Left Offset 0 Right Offset = 0 River = st vrain Reach = siegrist RS Profile Method Valuel Value2 70609 PF 2 1 2210 69640 PF 2 1 2180 Page 4 of 17 Siegrist Rivelcance TA#99-122 Post Project 11-09-99 By: KES Check: Siegrist prj. Post Construction 68595 PF 2 1 2290 67700 PF 2 1 2480 65750 PF 2 1 1900 63630 PF 2 1 1742.77 FLOW DATA Flow Title: Normal Depth Flow File : a:\siegrist.f03 Flow Data (cfs) River Reach RS PF 1 PF 2 st vrain siegrist 70609 16500 16500 st vrain siegrist 69640 16500 16500 st vrain siegrist 68595 16500 16500 st vrain siegrist 67700 16450 16450 st vrain siegrist 66525 16400 16400 st vrain siegrist 65750 16400 16400 st vrain siegrist 64715 16400 16400 st vrain siegrist 63630 16400 16400 st vrain siegrist 62755 16350 16350 Boundary Conditions River Reach Profile Upstream Downstream st vrain siegrist PF 1 Normal S = .001 Normal S = .001 st vrain siegrist PF 2 Normal S = .001 Normal S = .001 GEOMETRY DATA Geometry Title: Pre-construction Geometry File : a:\siegrist.g12 CROSS SECTION RIVER: st vrain REACH: siegrist RS: 70609 INPUT Description: DS Bridge ICON xsec 50 and corps xsec Station Elevation Data num= 87 Sta Elev Sta Elev Sta Elev Sta Elev Sta Elev 1000 4876.06 1048.01 4872.94 1082.22 4869.94 1112.1 4867.94 1137.9 4866.72 1207.35 4864.94 1244.59 4863.4 1306.3 4861.47 1339.33 4859.34 1357.53 4857.28 1366.82 4855.46 1383.76 4853.25 1405.45 4850.95 1430.13 4848.67 1458.16 4846.55 Page 5 of 17 Siegrist Riveruance TA#99-122 Post Project 11-09-99 By: KES Check: Siegrist prj. Post Construction 1493.21 4843.94 1526.02 4841.49 1551.59 4840.05 1583.61 4837.94 1622.2 4835.49 1682.78 4833.72 1725.91 4832.3 1806.11 4830.58 1841.67 4828.94 1873.66 4827.26 1918.39 4825.3 2083.55 4818 2145.91 4818 2179.62 4818 2190.4 4818 2201.53 4818 2340.8 4818 2362.73 4818 2472.97 4818 2482.17 4818 2545.46 4818 2598.48 4818 2612.89 4818 2653.43 4818 2673.07 4818 2717.89 4818 2729.21 4826.42 2742.03 4826.62 2748.88 4826.94 2752.94 4827.24 2755.12 4827.47 2765.55 4829.83 2779.51 4832.29 2832.65 4832.76 2887.61 4831.72 2909.19 4831.94 2927.43 4829.17 2935.45 4828.62 2956.17 4828.21 2981.15 4624.21 2984.13 4821.52 3058.72 4820.87 3081 4820.87 3105.86 4820.87 3132.18 4822.21 3142.11 4823.8 3151.17 4828.21 3163.18 4826.94 3175.72 4827.55 3190.74 4827.8 3197.37 4827.77 3306 4825.5 3451 4825.5 3628 4825.6 3762 4825 3780 4825 3914 4824.7 3934 4821.8 3954 4821.8 3972 4825.2 4105 4827.1 4129 4827.1 4336 4827.2 4469 4827.5 4597 4826.8 4757 4827.8 4766 4823.5 4782 4823.5 4807 4828.1 4945 4828.9 5096 4830 5292 4831.5 Manning's n Values num= 3 Ste n Val Sta n Val Sta n Val 1000 .3 2956.17 .3 3151.17 .3 Bank Sta: Left Right Lengths: Left Channel Right Coeff Contr. Expan. 2956.17 3151.17 1315.26 1330.01 1321.48 .1 .3 Ineffective Flow num= 2 Sta L Sta R Elev Sta L Sta R Elev 1000 2965.17 4870 3142.17 5292 4870 CROSS SECTION OUTPUT Profile #PF 2 E.G. Elev (ft) 4831.37 Element Left OB Channel Right OB Vel Head (ft) 3.20 Wt. n-val. 0.300 W.S. Elev (ft) 4828.17 Reach Len. (ft) 1315.26 1330.01 1321.48 Crit W.S. )ft) 4828.17 Flow Area (sq ft) 1149.14 E.G. Slope (ft/ft) 0.701226 Area (sq ft) 5270.85 1174.64 3284.77 Q Total (cfs) 16500.00 Flow (cfs) 16500.00 Top Width (ft) 2410.47 Top Width (ft) 548.21 194.67 1667.59 Vel Total (ft/s) 14.36 Avg. Vel. (ft/s) 14.36 Max Chi Dpth (ft) 10.17 Hydr. Depth (ft) 6.49 Cony. Total (cfs) 19704.0 Conv. (cfs) 19704.0 Length Wtd. (ft) 1326.00 Wetted Per. (ft) 178.41 Min Ch El (ft) 4820.87 Shear (lb/sq ft) 281.98 Alpha 1.00 Stream Power (lb/ft s) 4048.75 Frctn Loss (ft) 3.59 Cum Volume (acre-ft) 497.34 233.14 440.96 C & E Loss (ft) 0.93 Cum SA (acres) 98.30 42.54 193.30 Warning: Toe energy equation could not be balanced within the specified number of iterations. The program used critical depth for the water surface and continued on with the calculations. Warning: Divided flow computed for this cross-section. Warning: The velocity head has changed by more than 0.5 ft (0.15 m) . This may indicate the need for additional cross sections. Warning: The conveyance ratio (upstream conveyance divided by downstream conveyance) is less than 0.7 or greater than 1.4. This may indicate the need for additional cross sections. Page 6 of 17 Siegrist River.,oi,ce TA#99-122 Post Project 11-09-99 By:ICES Check: Siegrist prj. Post Construction Warning: The energy loss was greater than 1.0 ft (0.3 m) . between the current and previous cross section. This may indicate the need for additional cross sections. Warning; During the standard step iterations, when the assumed water surface was set equal to critical depth, the calculated water surface came back below critical depth. This indicates that there is not a valid subcritical answer. The program defaulted to critical depth. CROSS SECTION RIVER: st vrain REACH: siegrist RS; 69640 INPUT Description: SV-38 Station Elevation Data num= 78 Ste Elev Sta Elev Ste Elev Ste 6lev Ste Elev 1000 4860.27 1032.6 4857.86 1104.32 4852.26 1174.81 4845.21 1281.59 4837.94 1604.78 4831.19 1905.57 4827.94 2154.97 4818 2211.29 4818 2236.68 4818 2260.32 4818 2321.43 4818 2344.25 4818 2383.81 4818 2465.36 4818 2481.95 4818 2625.15 4818 2637.94 4818 2641.93 4818 2689.49 4818 2706.5 4818 2721.63 4818 2747.71 4818 2769.98 4818 2786.58 4818 2789.56 4818 2801.6 4818 2807.58 4824.94 2814.78 4824.93 2891.03 4825.2 2914.8 4825.94 2939.15 4825.62 2951.59 4824.94 2960.23 4818.94 3028.41 4815.2 3038.49 4815.2 3058.29 4815.2 3078.62 4815.2 3085.11 4815.2 3108.46 4815.2 3124.51 4815.2 3136.82 4815.2 3147.56 4815.2 3157.57 4818.94 3160.01 4820.06 3171.08 4821.94 3200.86 4824.54 3219.53 4824.94 3316.36 4824.49 3362.59 4824.16 3380.89 4824.1 3412.9 4823.94 3453.68 4824.22 3466 4821.3 3594 4821.9 3610 4819.5 3646 4819.5 3660 4820.4 3697 4822.1 3842 4822.1 3882 4823.5 - 3896 4820.5 4063 4820.6 4225 4820.6 4392 4820.6 4570 4820.6 4606 4825.9 4659 4823.9 4755 4823.9 4943 4824.8 4955 4821.8 4963 4821.8 4971 4823 5188 4828.4 5335 4830 5405 4830.3 5563 4831.9 5742 4833.7 Manning's n Values num= 3 Sta n Val Sta n Val Ste n Val 1000 .07 2914.8 .04 3219.53 .07 Bank Sta: Left Right Lengths: Left Channel Right Coeff Contr. Expan. 2914.8 3219.53 950 1045 1215 .1 .3 CROSS SECTION OUTPUT Profile #PF 2 E.G. Elev (ft) 4824.00 Element Left OB Channel Right OB Vel Head (ft) 0.10 Wt. n-Val. 0.070 0.040 0.070 W.S. Elev (ft) 4823.90 Reach Len. (ft) 950.00 1045.00 1215.00 Crit W.S. (ft) Flow Area (sq ft) 3682.68 1653.26 3327.11 E.G. Slope (ft/ft) 0.000722 Area (sq ft) 3682.68 1653.26 3327.11 Total (rfs) 16500.00 Flow (cfs) 6777.46 5920.05 3902.49 Top Width (ft) 2161.22 Top Width (ft) 626.68 240.45 1294.09 Vel Total (ft/s) 1.90 Avg. Vel. Ift/sl 1.84 3.58 1.14 Max Chl Dpth (ft) 8.70 Hydr. Depth (ft) 5.88 6.88 2.57 Conv. Total (cfs) 614149.1 Cony. (cfs) 252264.8 220351.2 141533.1 Length Wtd. (ft) 1030.72 Wetted Per. (ft) 635.29 243.27 1295.58 Min Ch El (ft) 4815.20 Shear (lb/sq ft) 0.26 0.31 0.12 Alpha 1. 73 stream Power (lb/ft s; 0.48 i.10 0.13 Page 7of17 Siegrist Rivezuance 17O 99-122 Post Project 11-09-99 fly:ICES Check: Siegrist prj. Post Construction Frctn Loss (ft) 1.58 Cum Volume (acre-ft) 362.17 189.96 340.67 C & E Loss (ft) 0.04 Cum SA (acres) 80.56 35.90 148.37 Warning: Divided flow computed for this cross-section. Warning: The conveyance ratio (upstream conveyance divided by downstream conveyance) is less than 0.7 or greater than 1.4. This may indicate the need for additional cross sections. Warning: The energy loss was greater than 1.0 ft (0.3 m) . between the current and previous cross section. This may indicate the need for additional cross sections. CROSS SECTION RIVER: st vrain REACH: siegrist RS: 68595 INPUT Description: SV-37 Station Elevation Data num= 63 Sta Elev Sta Elea/ Sta Elev Sta Elev Sta Elev 1349.28 4833.49 1369.23 4833.11 1421.27 4830.94 1443.97 4829.84 1483.68 4828.02 1523.08 4826.27 1550.29 4824.86 1576.02 4822.94 1602.62 4820.51 1624.52 4818.2 1654.95 4817.94 2780.93 4817.94 2801.01 4817.94 2815.62 4817.94 2829.45 4818.94 2845. /3 4822.39 2870.83 4824.94 2920.6 4823.94 2959.3 4821.94 2973.16 4818.44 2984.61 4817.6 3012.48 4813.4 3105.91 4817.94 3122.31 4820.94 3130.83 4824.27 3144.14 4822.94 3158.8 4822.98 3182.12 4823.08 3224.61 4822.67 3268.48 4821.91 3333.96 4821.7 3408.77 4821.78 3475.02 4821.77 3539.65 4821.88 3611.88 4821.43 3622.22 4821.4 3636.78 4821.94 3805 4821.2 4005 4820.6 4149 4820.3 4172 4818.7 4205 4820.5 4404 4822 4499 4819.8 4586 4820 4602 4821.1 4653 4821.2 4667 4820.3 4688 4822.4 4804 4821.7 4842 4821.8 4894 4825.4 4909 4823 4917 4821.8 4933 4821.8 4941 4825.5 5003 4827.6 5205 4829.3 5405 4830.7 5605 4831 5805 4831.2 6005 4831.6 6205 4833.6 Manning's n Values num= 3 Sta n Val Sta n Val Sta n Val 1349.28 .07 2870.63 .04 3130.83 .07 Bank Sta: Left Right Lengths: Left Channel Right Coeff Contr. Expan. 2870.83 3130.83 865 875 925 .1 .3 CROSS SECTION OUTPUT Profile YPF 2 E.G. Elev (ft) 4822.37 Element Left OB Channel Right OB vel Head (ft) 0.53 Wt. n-Val. 0.070 0.040 0.070 W.S. Elev (ft) 4821.84 Reach Len. (ft) 865.00 875.00 925.00 Crit W.S. (ft) Flow Area (sq ft) 2118.08 860.57 1068.77 Slope .t/ft) 0.....5246 eg 2118.08 860.... 1068.77 .� . nn_on r.,., i f _ , g Total (cis) 16500.00 Flow (cfs( 7929.68 6928.27 1642.04 Top Width (ft) 2108.67 Top Width (ft) 553.15 164.93 1390.59 Vel Total (ft/s) 4.08 Avg. Vel. (ft/s) 3.74 8.05 1.54 Max Chl Dpth (ft) 8.44 Hydr. Depth (ft) 3.83 5.22 0.77 Cony. Total (cfs) 227819.2 Cony. (cfs) 109486.9 95660.3 22672.1 Length Wtd. (ft) 882.22 Wetted Per. (ft) 557.39 166.25 1390.90 Min Ch El (ft) 4813.40 Shear (1b/sq ft) 1.24 1.70 0.25 Page 8 of 17 Siegrist Riveruance TA#99-122 Post Project 11-09-99 By: KES Check: Siegrist prj. Post Construction Alpha 2.06 Stream Power (1b/ft s) 4.66 13.65 0.39 Frctn Loss (ft) 2.67 Cum Volume (acre-ft) 298.91 159.81 279.37 C b E Loss (ft) 0.12 Cum SA (acres) 67.69 31.03 110.93 Warning: Divided flow computed for this cross-section. Warning: The conveyance ratio (upstream conveyance divided by downstream conveyance) is less than 0.7 or greater than 1.4. This may indicate the need for additional cross sections. Warning: The energy loss was greater than 1.0 ft (0.3 m) . between the current and previous cross section. This may indicate the need for additional cross sections. CROSS SECTION RIVER: st vrain REACH: siegrist RS: 67700 INPUT Description: SV-36 Station Elevation Data num= 64 Sta Elev Sta Elev Sta Elev Eta Elev Eta Elev 1451.45 4828.88 1499.64 4827.85 1542.39 4826.46 1620.63 4824.79 1749.62 4824.4 1784.14 4822.96 1803.67 4820.94 1814 4819.94 1832.13 4817.94 1844.51 4815.94 1869.79 4812.94 1879.09 4812.94 2024.41 4812.94 2047.22 4814.88 2056.43 4812.94 2294.31 4812.94 2314.14 4812.94 2327.69 4813.73 2344.65 4813.28 2358.78 4812.94 2372.15 4812.94 2832.1 4812.94 2846.46 4812.94 2855.58 4816.37 2866.65 4819.42 2919.04 4822.94 2929.3 4819.94 2938.55 4817.25 3036.49 4811.7 3054.58 4821.94 3131.54 4820.94 3150.95 4820.3 3161.4 4819.94 3173.87 4618.08 3232.96 4814.13 3538.9 4814.94 3559.85 4816.94 3576.16 4818.22 3589.21 4818.98 3612.38 4819.94 3645.97 4819.92 3687.6 4818.94 3708.44 4817.2 3716.14 4814.94 3819.54 4814.13 3945 4820.2 4145 4818.7 4179 4819.2 4193 4818.2 4240 4820 4347 4822.2 4546 4821.3 4601 4824.2 4619 4825 4635 4820.6 4651 4820.6 4677 4825 4701 4824.5 4746 4826.1 4946 4827.4 5145 4828.3 5346 4829.1 5546 4829.7 5747 4830.2 Manning's n Values num= 3 Sta n Val Sta n Val Sta n Val 1451.45 .07 2919.04 .04 3054.58 .07 Bank Ste: Left Right Lengths: Left Channel Right Coeff Contr. Expan. 2919.04 3054.58 1160 1175 1075 .1 .3 CROSS SECTION OUTPUT Profile %PF 2 E.G. Elev (ft) 4819.59 Element Left 06 Channel Right 08 Vel Head (ft) 0.15 Wt. n-Val. 0.070 0.040 0.070 W.S. Elev (ft) 4819.44 Reach Len. (ft) 1160.00 1175.00 1075.00 E.G` W.S. (ft) Flow Area (sq ft) 2444,43 547,94 2766 R6 P7 Slope (ft/ft) 0.001954 Area (sq ft) 2444.43 547.94 2766.86 q Total (cfs) 16450.00 Flow (cfs) 7737.03 2453.61 6259.36 Top Width (ft) 1384.79 Top Width (ft) 387.01 119.17 878.61 Vel Total (ft/s) 2.86 Avg. Vel. (ft/s) 3.17 4.48 2.26 Max Chl Dpth (ft) 7.74 Hydr. Depth (ft) 6.32 4.60 3.15 Conv. Total (cfs( 372146.9 Conv. (cfs) 175034.2 55507.7 141605.0 Length Wtd. (ft) 1128.92 Wetted Per. (ft) 394.55 121.68 879.62 Page 9 of 17 Siegrist Riveruance TA#99-122 Post Project 11-09-99 By ICES Check: Siegrist prj. Post Construction Min Ch El (ft) 4811.70 Shear (lb/sq ft) 0.76 0.55 0.38 Alpha 1.18 Stream Power (16/ft s) 2.39 2.46 0.87 Frctn Loss (ft) 0.73 Cum Volume (acre-ft) 253.61 145.67 238.64 C & E Loss (ft) 0.04 Cum SA (acres) 58.36 28.18 86.84 Warning: Divided flow computed for this cross-section. Warning: The conveyance ratio (upstream, conveyance divided by downstream, conveyance) is less than 0.7 or greater than 1.4. This may indicate the need for additional cross sections. CROSS SECTION RIVER: st vrain REACH: siegrist RS: 66525 INPUT Description: SV-35 Station Elevation Data num= 64 Ste Elev Ste Elev Sta Slav Sta Elev Ste Slav 1423.15 4827.22 1441.22 4824.79 1461.64 4823.3 1472.36 4821 1489.77 4819.18 1504.82 4817.94 1512.01 4814.74 1520.68 4812.94 1539.6 4812.94 2447.33 4812.94 2457.1 4812.94 2468 4814.85 2482.24 4817.94 2499.72 4821.03 2513.58 4821.22 2536.1 4820.42 2540.86 4820.46 2590.19 4820.4 2608.76 4821.17 2618.15 4818.61 2627.57 4813.75 2643.82 4812.83 2653.84 4812.78 2696.24 4810.4 2757.89 4811.94 2802.4 4814.28 2861.97 4819.98 2915.62 4819.11 2991.65 4819.11 3061.25 4819.5 3131.77 4819.01 3151.72 4817.94 3162.23 4812.94 3165.3 4812.51 4023.26 4812.51 4031.67 4812.79 4033.84 4816.65 4139 4821.4 4163 4825.6 4183 4820.1 4196 4820.1 4213 4823.7 4389 4825.2 4578 4826.2 4586 4825.3 4593 4826.2 4786 4826.4 4987 4827.3 5142 4828.8 5168 4828.8 5176 4826.3 5187 4828.2 5193 4827.5 5200 4829.1 5210 4826.2 5388 4827 5502 4828.2 5511 4827.5 5519 4828.2 5590 4828.3 5788 4828.5 5990 4828.9 6191 4828.9 6326 4829.7 Manning's n Values num= 3 Ste n Val Ste n Val Sta n Val 1423.15 .07 2608.76 .04 2861.97 .07 Bank Sta: Left Right Lengths: Left Channel Right Coeff Contr. Expan. 2608.76 2861.97 720 775 830 .1 .3 CROSS SECTION OUTPUT Profile #PF 2 E.G. Elev (ft) 4818.83 Element Left OB Channel Right OB Vel Head (ft) 0.03 Wt. n-Val. 0.070 0.040 0.070 W.S. Elev (ft) 4818.80 Reach Len. (ft) 720.00 775.00 830.00 Crit W.S. (ft) Flow Area (sq ft) 5639.35 1309.77 5566.43 Slope ft/ft, sq t) 5639.35 1309. . . 5566.43 Q Total (cfs) 16400.00 Flow (cfs) 6798.26 2740.67 6861.07 Top Width (ft) 2170.44 Top Width (ft) 992.67 232.14 945.63 Vel Total (ft/s) 1.31 Avg. Vel. (ft/s) 1.21 2.09 1.23 Max Chl Dpth (ft) 8.40 Hydr. Depth (ft) 5.68 5.64 5.89 Cony. Total (cfs) 918531.9 Cony. (cfs) 380757.1 153499.7 384275.2 Length Wtd. (ft) 766.95 Wetted Per. (ft) 994.14 233.74 949.12 Min Ch El (ft) 4810.40 Shear (lb/sq ft) 0.11 0.11 0.12 Page 10 of 17 Siegrist Riveruance TAO/99-122 Post Project 11-09-99 By: KES Check: Siegrist prj. Post Construction Alpha 1.15 Stream Power (lb/ft s) 0.14 0.23 0.14 Frctn Loss (ft) 0.42 Cum Volume (acre-ft) 145.98 120.61 135.81 C 5 E Loss (ft) 0.01 Cum SA (acres) 39.99 23.44 64.33 Warning: Divided flow computed for this cross-section. Warning: The conveyance ratio (upstream conveyance divided by downstream conveyance) is less than 0.7 or greater than 1.4. This may indicate the need for additional cross sections. CROSS SECTION RIVER: st vrain REACH: siegrist RS: 65750 INPUT Description: SV-34 Station Elevation Data num= 62 Sta Elev Sta Elev Sta Elev Sta Elev Sta Elev 1510.57 4825.66 1522.34 4825.43 1543.91 4825.26 1564.36 4823.94 1572.48 4821.48 1582.4 4817.94 1590.39 4815.31 1603.27 4812.94 1720.78 4812.94 1849.54 4812.94 1911.66 4812.94 1921.48 4812.94 2455.35 4812.94 2466.42 4812.94 2479.28 4812.94 2495.14 4814.58 2504.97 4816.94 2509.89 4817.94 2519.59 4819.01 2562.13 4816.94 2590.94 4813.42 2622.56 4813.19 2685.87 4812.21 2779.15 4809.8 2874.96 4814.47 2932.75 4814.68 3038.78 4817.77 3234.9 4817.02 3430.24 4816.42 3553.75 4816.29 3646 4815.9 3749.21 4815.94 3805.24 4815.77 3911.42 4816.93 4005.85 4818.32 4166.63 4821.94 4243 4821.8 4444 4821.9 4497 4823.5 4507 4817.9 4527 4817.9 4544 4823.2 4555 4821.7 4646 4821.7 4845 4821.9 4927 4822 4948 4821.2 4964 4824.3 5004 4823.7 5048 4824 5246 4825.5 5381 4825.8 5395 4827 5405 4824.3 5419 4826.3 5444 4826.3 5457 4824.3 5471 4625.3 5646 4826.2 5844 4826.4 6043 4827.4 6250 4827 Manning's n Values num= 3 Sta n Val Sta n Val Sta n Val 1510.57 .07 2590.94 .04 2874.96 .07 Bank Sta: Left Right Lengths: Left Channel Right Coeff Contr. Expan. 2590.94 2874.96 920 1035 980 .1 .3 CROSS SECTION OUTPUT Profile #PF 2 E.G. Elev (ft) 4818.40 Element Left OB Channel Right OB Vel Head (ft) 0.16 Wt. n-Val. 0.070 0.040 0.070 W.S. Elev (ft) 4818.24 Reach Len. (ft) 920.00 1035.00 980.00 Crit W.S. (ft) Flow Area (sq ft) 3274.05 1765.97 1955.37 E.G. Slope (ft/ft) 0.001144 Area (sq ft) 3274.05 1765.97 1955.37 Q Total (cfS) 16400.00 Flow / V 878.89 7501.47 2015.64 Top Width (ft) 2099.10 Top Width (ft) 668.07 284.02 1147.00 Ve) Total (ft/s) 2.34 Avg. Vel. (ft/s) 2.10 4.25 1.03 Max Chl Dpth (ft) 8.44 Hydr. Depth (ft) 4.90 6.22 1.70 Conv. Total (cfs) 484785.9 Cony. (cfs) 203340.8 221744.2 59700.9 Length Wtd. (ft) 981.20 Wetted Per. (ft) 674.10 284.17 1147.21 Min Ch El (ft) 4809.80 Shear (1b/sq ft) 0.35 0.44 0.12 Alpha 1.86 Stream Power (lb/ft s) 0.73 1 .89 0.13 Page 11 of 17 Siegrist Riverualce TA#99-122 Post Project 11-09-99 BY ICES Check: Siegrist prj. Post Construction Frctn Loss (ft) 2.61 Cum Volume (acre-ft) 72.31 93.25 64.15 C 5 E Loss (ft) 0.06 Cum SA (acres) 26.26 18.85 44.39 Warning: Divided flow computed for this cross-section. Warning: The velocity head has changed by more than 0.5 ft (0.15 m) . This may indicate the need for additional cross sections. Warning: The ^_on .c_ ratio (upstream conveyance divided by downstream conveyance) is less than 0.7♦conveyance ratio than 1.4. This may indicate the need for additional cross sections. Warning: The energy loss was greater than 1.0 ft (0.3 m) . between the current and previous cross section. This may indicate the need for additional cross sections. CROSS SECTION RIVER: st vrain REACH: siegrist RS: 64715 INPUT Description: SV-33 Station Elevation Data num= 57 Sta Elev Sta Elev Sta Elev Sta Elev Sta Elev 1177.09 4826.3 1191.87 4823.23 1231.4 4820.94 1245.08 4819.34 1258.38 4816.46 1269.51 4813.62 1290.27 4812.94 1322.41 4812.94 2092.5 4812.94 2104.59 4813.31 2119.12 4816.63 2134.39 4819.07 2166.67 4816.94 2177.25 4810.94 2238.77 4808.9 2267.08 4809.92 2301.1 4810.94 2337.13 4813.86 2360.98 4814.92 2368.78 4814.88 2430.17 4814.76 2521.38 4815.32 2607.02 4814.94 2613 4814.3 2630 4813.9 2831 4813.8 2994 4813.6 3017 4809.5 3036 4809.5 3065 4813.2 3231 4813.8 3430 4814.6 3629 4815.5 3832 4815.8 3998 4816.8 4005 4816 4010 4816.8 4030 4816.8 4067 4815.8 4082 4816.6 4230 4819.6 4291 4820.4 4302 4823 4316 4817 4324 4817 4348 4823 4394 4821.5 4432 4821.9 4575 4823.5 4629 4823.5 4829 4823.5 5029 4823.9 5229 4824.5 5302 4825.3 5319 4826.1 5326 4823.4 5337 4826.2 Manning's n Values num= 3 Sta n Val Sta n Val Sta n Val 1177.09 .07 2134.39 .04 2360.98 .07 Bank Sta: Left Right Lengths: Left Channel Right Coeff Contr. Expan. 2134.39 2360.98 1055 1085 1040 .1 .3 CROSS SECTION OUTPUT Profile DE 2 E.G. Elev (ft) 4815.72 Element Left O8 Channel Right OB Vel Head (ft) 0.76 Wt. n-Val. 0.070 0.040 0.070 W.S. Elev (ft) 4814.93 Reach Len. (ft) 1055.00 1085.00 1040.00 Grit .481.4.93 Floe; Area ft) 1664.71 736.36 1125,07 Grit W.S.r., e c� � Area i E.G. Slope (ft/ft) 0.011973 Area (sq ft)y 1664.71 736.35 1125.92 Q Total (cfs) 16400.00 Flow (cfs) 6063.70 7332.61 3003.68 Top Width (ft) 2032.27 Top Width (ft) 847.33 190.77 994.17 Vel Total (ft/s) 4.65 Avg. Vel. (ft/s) 3.64 9.96 2.67 Max Chl Dpth (ft) 6.03 Nydr. Depth (ft) 1.96 3.86 1.13 Cony. Total (cfs) 149878.7 Conv. (cis) 55415.9 67012.4 27450.5 Length Wtd. (ft) Wetted Per. (ft) 847.70 192.03 994.81 Page 12 of 17 Siegrist Riveruance TA#99-122 Post Project 11-09-99 By: KES Check: Siegrist prj. Post Construction Min Ch El (ft) 4808.90 Shear (lb/sq ft) 1.47 2.87 0.85 Alpha 2.34 Stream Power (lb/ft s) 5.35 28.54 2.26 Frctn Loss (ft) Cum Volume (acre-ft) 20.16 63.52 29.49 C & E Loss (ft) Cum SA (acres) 10.26 13.21 20.31 Warning: The energy equation could not be balanced within the specified number of iterations. The program used critical depth for the water surface and continued on with the calculations. Warning: Divided flow computed for this cross-section. Warning: The velocity head has changed by more than 0.5 ft (0.15 m) . This may indicate the need for additional cross sections. Warning: The conveyance ratio (upstream conveyance divided by downstream conveyance) is less than O.7 or greater than 1.4. This may indicate the need for Add+tional cross sections. Warning: The energy loss was greater than 1.0 ft (0.3 m) . between the current and previous cross section. This may indicate the need for additional cross sections. CROSS SECTION RIVER: st vrai.n REACH: siegrist RS: 63630 INPUT Description: SV-32 Station Elevation Data num= 68 Sta Slew Sta Elev Sta Slew Sta Slew Sta Elev 1269.29 4825.94 1297 4623.7 1341.69 4821.72 1381.69 4819.27 1408.54 4816.94 1448.4 4815.53 1484.82 4816.26 1510.52 4813.02 1553.44 4809.94 1725.56 4809.94 1742.77 4813.73 1766.87 4812.21 1768.6 4811.56 1785.06 4807.94 1829.9 4807.57 1856.83 4807.57 1907.41 4807.57 1953.5 4807.57 2003.12 4807.57 2039.3 4807.57 2067.92 4807.57 2105.95 4807.57 2142.82 4807.57 2172.91 4807.57 2257.6 4807.57 2313.17 4807.57 2347.61 4807.57 2365.93 4807.57 2411.05 4807.57 2444.93 4807.57 2457.45 4807.57 2473.77 4807.57 2488 4807.57 2597.36 4807.57 2627.87 4811.97 2639.59 4810.61 2657.73 4807.57 2739.27 4807.57 2751.49 4810.3 2773.26 4810.95 2794.65 4811.45 2828.8 4811.94 2880.11 4811.72 2891 4811.2 2959 4811.7 3159 4811.2 3318 4811.3 3377 4816.5 3559 4816.2 3759 4816.5 3934 4816.9 3942 4819.4 3950 4817 3958 4818.2 3985 4818.2 3997 4817.4 4008 4818.4 4159 4819.4 4221 4819.2 4238 4820.5 4255 4815.8 4265 4815.8 4287 4820.3 4361 4819.8 4560 4820.2 4761 4820.6 4869 4820.8 4698 4823.4 Manning's n Values num- 3 Sta n Val Sta n Val Sta n Val 1269.29 .07 1742.77 .04 2627.87 .07 Bank Sta: Left Right Lengths: Left Channel Right Coeff Contr. Expan. 1742.77 2627.87 825 875 805 .1 .3 CROSS SECTION uUTPUT Profile #PF 2 E.G. Elev (ft) 4812.94 Element Left OB Channel Right OB Vel Head (ft) 0.17 Wt. n-Val. 0.040 0.070 W.S. Elev (ft) 4812.77 Reach Len. (ft) ern_ W.S. (ft) 4809.78 Flow Area (sq ft) 4364.05 1344.55 E.G. Slope (ft/ft) 0.001000 Area (sq ft) 4364.05 1344.55 Page 13 of 17 Siegrist Riveruance TA#99-122 Post Project 11-09-99 By:KES Check: Siegrist prj. Post Construction 0 Total (cfs) 16400.00 Flow (cfs) 15015.19 1384.81 Top Width (ft) 1576.78 Top Width (ft) 869.93 706.85 Vel Total (ft/s) 2.87 Avg. Vel. (ft/s) 3.44 1.03 Max Chl Dpth (ft) 5.20 Hydr. Depth (ft) 5.02 1.90 Conv. Total (cfs) 518551.9 Cony. (cfs) 474765.6 43786.3 Length Wtd. (ft) Wetted Per. (ft) 870.78 707.58 Min Ch El (ft) 4807.57 Shear (lb/sq ft) 0.31 0.12 Alpha 1.32 Stream Power (lb/ft s) 1.08 0.12 Frctn Loss (ft) Cum Volume (acre-ft) C & E Loss (ft) Cum SA (acres) SUMMARY OF MANNING'S N VALUES River:st vrain Reach River Sta. nl n2 n3 siegrist 70609 .3 .3 .3 siegrist 69640 .07 .04 .07 siegrist 68595 .07 .04 .07 siegrist 67700 .07 .04 .07 siegrist 66525 .07 .04 .07 siegrist 65750 .07 .04 .07 siegrist 64715 .07 .04 .07 siegrist 63630 .07 .04 .07 SUMMARY OF REACH LENGTHS River: Et vrain Reach River Sta. Left Channel Right siegrist 70609 1315.26 1330.01 1321.48 siegrist 69640 950 1045 1215 siegrist 68595 865 875 925 siegrist 67700 1160 1175 1075 siegrist 66525 720 775 830 siegrisc 65750 920 1035 980 s-egc st 64715 1055 1040 siegrist 63630 825 875 805 SUMMARY OF CONTRACTION AND EXPANSION COEFFICIENTS River: at vrain Page 14 o117 Siegrist Riveruance TA#99-122 Post Project 11-09-99 By: KES Check: Siegrist prj. Post Construction Reach River Sta. Contr. Expan. siegrist 70609 .1 .3 siegrist 69640 .1 .3 siegrist 68595 .1 .3 siegrist 67700 .1 .3 siegrist 66525 .1 .3 siegrist 65750 .1 .3 siegrist 64715 .1 .3 siegrist 63630 .1 .3 Profile Output Table - CHECKRAS Reach River Sta Froude # Chl Top Wdth Act Cony. Total Prof Delta WS Left Sta Eff Enc Sta L Center Station Enc Ste R Rght Sta Eff Min Ch El Left Stagn Right Stagn (ft) (cfs) (ft) (ft) (ft) (ft) (ft) (ft) (ft) (ft) (ft) siegrist 70609 0.99 177.00 19704.0 0.00 2965.17 2210.00 3053.67 3142.17 4820.87 siegrist 69640 0.24 2161.22 614149.1 0.67 2180.00 2180.00 3067.17 5007.18 4815.20 siegrist 68595 0.62 2108.67 227819.2 1.53 2290.00 2290.00 3000.63 4933.09 4813.40 siegrist 67700 0.37 1384.79 372146.9 0.39 2480.00 2480.00 2986.81 4225.49 4811.70 siegrist 66525 0.16 2170.44 918531.9 0.33 1494.42 2735.36 4081.37 4810.40 siegrist 65750 0.30 2099.10 484785.9 0.29 1900.00 1900.00 2732.95 4528.08 4809.80 siegrist 64715 0.89 2032.27 149678.7 0.00 1264.36 2247.69 3503.75 4808.90 siegrist 63630 0.27 1576.78 518551.9 0.11 1757.94 1742.77 2185.32 3334.72 4807.57 Profile Output Table - Standard Table 1 Reach River Sta Q Total Min Ch El W.S. Elev Grit W.S. E.G. Elev E.G. Slope Vel Chnl Flow Area Top Width Froude # Chl (cfs) (ft) (ft) (ft) (ft) (ft/ft) (ft/s) (sq ft) (ft) 70609 iecnn nn g82n 07 1070 17 8020 0871 37 7m nn9 14 36 49 ' siegrist .� .n 2410.47 0.99 siegrist 69640 16500.00 4815.20 4823.90 4824.00 0.000722 3.56 8663.05 2161.22 0.29 siegrist 68595 16500.00 4813.40 4821.84 4822.37 0.005246 8.05 4047.42 2108.67 0.62 siegrist 67700 16450.00 4811..70 4819.44 4819.59 0.001954 4.48 5759.24 1384.79 0.37 siegrist 66525 16400.00 4810.40 4818.80 4818.83 0.000319 2.09 12515.55 2170.44 0.16 siegrist 65750 16400.00 4809.80 4818.24 4818.40 0.001144 4.25 6995.39 2099.10 0.30 siegrist 64715 16400.00 4808.90 4814.93 4814.93 4815.72 0.011973 9.96 3526.98 2032.27 0.89 siegrist 63630 16400.00 4807.57 4812.77 4809.78 4812.94 0.001000 3.44 5708.60 1576.78 0.27 Page 15 of 17 Siegrist Riveruance TA#99-122 Post Project 11-09-99 BY ICES Check: Siegrist prj. Post Construction Profile Output Table - Standard Table 2 Reach River Ste E.G. Elev W.S. Elev Vel Head Frctn Loss C 6 E Loss Q Left Q Channel Q Right Top Width (ft) (ft) (ft) (ft) (ft) (cfs) (cfs) (cfs) (ft) siegrist 70609 4831.37 4828.17 3.20 3.59 0.93 16500.00 2410.47 siegrist 69640 4824.00 4823.90 0.10 1.58 0.04 6777.46 5920.05 3802.49 2161.22 siegrist 68595 4822.37 4821.84 0.53 2.67 0.12 7929.68 6928.27 1642.04 2108.67 siegrist 67700 4819.59 4819.44 0.15 0.73 0.04 7737.03 2453.61 6259.36 1384.79 siegrist 66525 4818.83 4818.80 0.03 0.42 0.01 6798.26 2740.67 6861.07 2170.44 siegrist 65750 4818.40 4818.24 0.16 2.61 0.06 6878.89 7501.47 2019.64 2099.10 siegrist 64715 4815.72 4814.93 0.78 6063.70 7332.61 3003.68 2032.27 siegrist 63630 4812.94 4812.77 0.17 15015.19 1384.81 1576.78 ERRORS WARNINGS AND NOTES Errors Warnings and Notes for Plan : pre constr River: st vrain Reach: siegrist RS: 70609 Profile: PF 2 Warning:The energy equation could not be balanced within the specified number of iterations. The program used critical depth for the water surface and continued on with the calculations. Warning:Divided flow computed for this cross-section. Warning:The velocity head has changed by more than 0.5 ft (0.15 m) . This may indicate the need for additional cross sections. Warning:The conveyance ratio (upstream conveyance divided by downstream conveyance) is less than 0.7 or greater than 1.4. This may indicate the need for additional cross sections. Warning:The energy loss was greater than 1.0 ft (0.3 m) . between the current and previous cross section. This may indicate the need for additional cross sections. Warning:During the standard step iterations, when the assumed water surface was set equal to critical depth, the calculated water surface came back below critical depth. This indicates that there is not a valid subcritical answer. The program defaulted to critical depth. River: st vrain Reach: siegrist RS: 69640 Profile: PF 2 Warning:Divided flow computed for this cross-section. Warning:The conveyance ratio (upstream conveyance divided by downstream conveyance) is less than 0.7 or greater than 1.4. This may indicate the need for additional cross sections. Warning:The energy loss was greater than 1.0 ft (0.3 m) . between the current and previous cross section. This may indicate the need for additional cross sections. River: st vrain Reach: siegrist RS: 68595 Profile: PF 2 Warning:Divided flow computed for this cross-section. Warning:The conveyance ratio (upstream conveyance divided by downstream conveyance) is less than 0.7 or greater than 1.4. This may indicate the need for additional cross sections. Warning:The energy loss was greater than 1.0 ft (0.3 m) . between the current and previous cross section. This may indicate the need for additional cross sections. River; st vrain Reach: siegrist RS: 67700 Profile: PF 2 Warning:Divided flow computed for this cross-section. Warning:The conveyance ratio (upstream conveyance divided by downstream conveyance) is less than 0.7 or greater than 1.4. This may indicate the need for additional cross sections. River: st vrain Reach: siegrist RS: 66525 Profile: PF 2 Warning:Divided flow computed for this cross-section. Page 16 of 17 Siegrist Riveruance TA#99-122 Post Project 11-09-99 By: ICES Check: Siegrist prj. Post Construction Warning:The conveyance ratio (upstream conveyance divided by downstream conveyance) is less than 0.7 or greater than 1.4. This may indicate the need for additional cross sections. River: st vrain Reach: siegrist RS: 65750 Profile: PF 2 warning:Divided flow computed for this cross-section. Warning:The velocity head has changed by more than 0.5 ft (0.15 m) . This may indicate the need for additional cross sections. Warning:The conveyance ratio (upstream conveyance divided by downstream conveyance) is less than 0.7 or greater than 1.4. This may indicate the need for additional cross sections. warning:The energy loss was greater than 1.0 ft (0.3 m) . between the current and previous cross section. This may indicate the need for additional cross sections. River: st vrain Reach: siegrist RS: 64715 Profile: PF 2 Warning:The energy equation could not be balanced within the specified number of iterations. The program used critical depth for the water surface and continued on with the calculations. warning:Divided flow computed for this cross-section. Warning:The velocity head has changed by more than 0.5 ft (0.15 m) . This may indicate the need for additional cross sections. Warning:The conveyance ratio (upstream conveyance divided by downstream conveyance) is less than 0.7 or greater than 1.4. This may indicate the need for additional cross sections. Warning:The energy loss was greater than 1.0 ft (0.3 m) . between the current and previous cross section. This may indicate the need for additional cross sections. Page 17 of 17 RF['CEL I-PH 1U ARE ISSUED FOR C0NVIR =I F uwLr C0NSULF FUL 51/F DRAWN0S IN CASE OF Col LICIS la 70 c J 2. 0 o n § ) r \ L.,i, ; S' n V `` ' \ y - � � ' F St Cr1 No eIt 1`` I !`` `. p 4 nv u V. � t ill -A \pJ \�� \ % ? ci _ R \ � Prime .' • i', p `� h -44 ju:.,�\`w��' W � s • ail t k r. -t-i... s Lat / C` r5 hi v I •• a - �- T - Tut•Applegate,Inc. y 1 _. �MOIIIFT COIYN,�MFF,fNC. CHANGE of ZONE ... _ 1 MIVFef}ANCF P.U!: 1 / • s 4 �1l A ir- J u / p0 1 III - IIC-- + -- — — .ems .e®. _.icl• _ --N- _ fj / � �// te/ CC..)Z \ , t V \ Z6 1/ j� �. C CautertIc. ,- / /7 iI_ f• . 1} '� � Y� --`-� : WCR 28 f �'t- ' 1 1 rgza 4.1 Q � k- /CC I-‘-'%.--------.-:S7 .! � / I r . ( ./, ��_ �i ,e 46/Q ', yz/j y�tA- < • , ,� 7 z , 11 - 'yY�'l� i' y �✓f-"��c,� � *For \ . k o y //•- i Y. 'V// g s _ .r,/,,v e J L WEST SECTION •' -le- L, .. Flo �r�Jjl f / OF SUBDIVISION L ^� 9 1:` % i- S CHANGE I - ._. 4.r . I j �.,,.�•+1y+ 1'p L ._4832 `ii i u.4. 1 '..� ,� ...,:•:„...,..,,------:-•;,V�Oq. ote r r 7. � V TAN . 1 ,� . '44.3(1 1 .B°Well 14. e SH 119 i ;•.+ c t- i� 4 . ,I. 4850., t -.. "t FlGURej) Oct.: S/24/99 Job No: 99-122 SIEGRIST COMPANIES, INC. _ TuttlsApplegate,lnc. Drawn: ECG :- Tut �0.r116os MWY k . Da: ECG RIVERDANOE P.U.D. �= u9»m.rr-34.93 Checked: D1 � Da,Co 992v file WON DWG ""NNRY MAP (303)02401 ,a:(l0M931A sl!malsiloirl FlP.1 Scale: 1--2000' — ai b \� � `;:T_ r I \ Th0Ynos Lake; a' \ y Lake; 4 Mulligan r1) titicil.. t` t '` 0 \4 Res . ' r \ i 19 20 ..Yf �%a --� N. j u 24 18 r n- W.C.R. 90/` -r, 30 R3 �� RL go�ntlbor P e 1i / 6 • ,� 3) _, '41;r#,41--1•/,,.'',!''yls'i s% \e — ji: W.C.R. fa '�1"R' 33 I _ r . f',' ',O„7-.4..,-1,,,,v, -�"� 1 , � i I. 3ti v�xt �'' ails s LOke� YB 4r 31 \ a ,s � "t_ri �(1Rion Res.) i A r .m....../ ,l \\per °: , � y i W c.R {Ye /� W.C.R. 24.9 +11)::,I C \ s I ‘ ” w .r _ ''• /SE I • ,I , 1.t se. eras ��\� y;.10? /fay , , �-4 i' , . N f`: � s 1 r. r l sty, "t �fo P�-' , /z ` 7 ti 2/ / .•• . - P @ - B:C.A 922 f{f I , , / ,, f s P r 'Q f • L I '-�- 1� f . I f8 , fB Z -t P , 13; W.C.R. 920.6 lPsi I - 11 ) 1 \ ._ . err ` ` ,r -- �e..e_ ••s. r .Tr I 1 7.C.R 920 /, •t 1a6 !l . . 1 ) Z. ( t ,�y 16 U `s pNRCB lc! f—Ll--1 1.3 It ki ♦' hi 0 1500 3000 Feet Legend a a I-2S MUD Area Boundary 1 Limiting Site Factors - Lowest Intensity \\\\\\ Town/City Annexations N EmPlornent Center - High Intensity Regional Park — — County Boundary Regional Commercial - Medkrm Intensity 6CP\ -—_ Existing Road _ t Community Pork - Proposed Rood •• W E i♦\ Neighborhood Center - Lower Intensity i'� Regional Troll System .`in Tw sew.Mho \P Neighborhood Park I �.. Other Community Trail r' �. 1 Residentlal Agricultural - Mixed intensity t1) Transit Center __ Section Line * Historic/Community Center 8 25 Mixed Use Development Area Structural Plan Map 2.1 Structural Land Use Map H EXHIBIT 2`,33752 B-1592 P-251 02/18/1997 01 :37P PG 19 OF 112 /CF. &z #5.aa • 28 �II - ...— _ ou iLJ 26 26 _ — A • FOSTER /----- Sanborn RESER VOIR ____,-- Reservoir ZONE 13 Dam t ® I . m ii ` I�71 WCR28 1 , I 1 - �� it �s 1` d I 35 33 34 i O 35 \ D ,i ST. VRAIN CREE , ii ,� r -y 7N:::: r o.,. 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