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Home My WebLink About20020512.tiff / 6ia� ./-?L PLANNING DEPARTMENT USE ONLY: Case Number Z 56 Application Fee: t 7C'°`' Receipt Number J"7 Date: n 9 O5 •o Application Checked By: R Planner Assigned to Caw: 2 To Be Completed by the Applicant: (Print or type only except for required signatures). I(we),the undersigned,hereby request the Department of Planning Services to review this PUD Sketch Plan for the proposed subdivision of the following described unincorporated area of Weld County. Legal Description:_See Attached Exhibit A (If additional space is required,attach an additional sheet of this same size or a copy of the deed) PARCEL NUMBER: _10610600072 (12 digit number-found on TAX I.D.or obtained at the Assessor's Office) Are you applying for an acception to the Public Water requirement? Yes No_X_-_ NAME OF PROPOSED PUD SUBDIVISION Garcia PUD EXISTING ZONING A PROPOSED ZONING E-Estate NO.OF PROPOSED LOTS_5 TOTAL AREA(ACRES)_29.02_LOT SIZE: AVERAGE_5.80_MINIMUM_2.60__ TOTAL AREA(ACRES)OF OPEN SPACE WITHIN THE PUD 4.38 acres UTILTI"IES: WATER: NAME Little Thompson SEWER NAME Septic GAS: NAME Public Service PHONE: NAME Quest ELECTRIC: NAME Pouchy Valley REA DISTRICTS: SCHOOL: NAME Thompson R2J School District FIRE: NAME Berthoud Fire Protection District PROPERTY OWNERS OF PUD SKETCH PLAN PARCEL(S) NAME Fran Garcia PHONE 970-587-2924 ADDRESS _914 N.5th St Johnstown,CO.80534 NAME PHONE ADDRESS APPLICANT OR AUTHORIZED AGENT(if different than above*) NAME Design Development Consultants ADDRESS _2627Redwing Road, Suite 350 Fort Collins,Colorado 80526 HOME TELEPHONE BUSINESS TELEPHONE 970-266-0585 If agent is different from the property owner,please submit written documentation from the property owner authorizing said agent to represent the owner. Signature: Owner or Authorized Agent EXHIBIT 2002-0512 Fran Garcia, PUD Estate Subdivision Planned Unit Development Change of Zone Specific Development Guide Line Major Components of the Specific Development Guide 1. Environmental Impacts The intent of the USE of this site is consistent with the current Comprehensive Master Plan for a PUD. This PUD is intended to provide a pleasant and safe environment for homeowners and visitors through the proposed planning design as shown on the drawing enclosed. Consideration for specific environmental characteristics are listed below and addressed accordingly. a. Noise and Vibration: The site is designed for minimal impact to proposed surrounding development and existing agricultural uses. Proposed access to the site shall be buffered by landscaping berms as well as the proximity of the irrigation canal on the northeast portion of the development. The proposed development uses are consistent similar types of land uses surrounding this site. Vibration due to traffic will not impact the surrounding area or this development due to the proposed lot sizes that will constrain such activities and volumes of traffic. The development proposes to limit the lot sizes and therefore it lesson's the impact of noise and vibration. b. Smoke. Dust and Odors: The proposed development Uses shall be required to meet Weld County Criteria and guidelines as set forth in the Weld County Land Use Code and the Environmental Protection Agency Federal guidelines(EPA)for smoke, dust and odor control. c. Heat. Light and Glare: Landscape buffering around the site as required by the PUD guidelines shall screen adjacent roadways from any site lighting and glare. Heat impacts to surrounding development are not expected from this development. d. Visual/Aesthetic Impacts: All development shall meet the design, landscape guidelines and land use criteria as set forth in Section 2 of the Development Standards found in the Weld County, Planned Unit Development Plan development standards. e. Electrical Interference: All electrical services shall be buried within this development. Any additional electrical or transmission services that may impede the service of electricity or reception of TV airwaves must meet the guidelines of the Federal Communications Commission (FCC) and shall not impede the services of surrounding proposed development. f. Water Pollution: Each site shall be responsible for storm water detention on individual lots. g. Waste Water: Individual septic systems are to be located on each lot. h. Wetland Removal: There are no wetlands located on this site. Erosion and Sedimentation: During Construction, all measures for sedimentation and erosion control measures shall be implemented as prescribed by the Weld County Engineering Department. j. Excavating, Filling and Gradingi The site design utilizes most of the existing grade for road construction and on site drainage. As each lot is sold, each lot purchaser shall be responsible for meeting the requirements for site excavation, lot grading and compaction of fill as required by Weld County Planning and Engineering to obtain a building permit. k. Drilling, Ditching and Dredgingi No new drilling will be allowed on this site upon approval of the Preliminary PUD Change of Zone. Additionally, ditching or dredging are not applicable at this time. However, if the purchaser of a lot requires such amenities for there respective building, then these items will be addressed during individual site plan review. Furthermore, this application request waiver from the Ordinance 89 JJ of the Weld County Comprehensive Plan, that stipulates the requirement that all structures must be located no closer than 350 feet from an existing oil or gas well or any structure associated with the extraction of mineral resource. The applicant request that the PUD will deviate from this bulk requirement and ask to be allowed the building envelopes to be placed on the final plat and that the envelope be allowed similar to the previous standard for setback from oil and gas structures of 200' is met. 1. Air Pollution: There are no anticipated impacts due to this proposed development. m. Solid Waste: All solid waste from this development shall be the responsibility of the individual lot owners. n. Wildlife Removal: This site currently exists as agricultural land and has no visible wildlife habitants. The irrigation canal may serve as a wildlife corridor and is proposed to remain uninhibited by the proposed development. o. Natural Vegetation Removal: The only native vegetation that exists on this site is native grass adjacent to the canal. Every effort will be taken during construction to preserve the native grasses adjacent to the ditch to preserve and maintain the open space. p. Radiation/Radioactive Material: This site shall remain free of radioactive material unless specific application by the purchaser of a lot requests such special use. In the event that this occurs, the owner shall be required by Weld County Planning and Engineering during their Site Plan review to submit respective State and Federal permitting use of said materials. Each site shall be required to file a radon test in conjunction with the building review for each lot. 2. Service Provision Impacts a. Schools: This site is a proposed PUD estate lot development. The tax revenue generated from this site will help in assisting the respective school district Thompson R2J. This site consists of approximately 29.02 acres and is not sufficient in size to support a school site. However, it is understood that respective school assessments may be required. b. Law Enforcement: This site is located within Weld County and relies on the Weld County Sheriff's Department for law enforcement. c. Fire Protection: This site is located within the Berthoud Fire Protection District and relies on Berthoud Fire Protection District. d. Ambulance: This site is located within the Berthoud Fire District and relies on the Berhoud ambulance service. e. Transportation: The site is bounded on the north by Weld County Road No. 60, and by WCR #3 on the east where access will be taken for the development. A new road designated by this subdivision bound the west boundary of this property. This road is proposed to be a 2 lane Collector road as defined by the PUD and cross sections enclosed. Internal roads consist of one cul-de-sac and one internal north-south road. Upon approval of this Preliminary PUD a formal On-Site Development Agreement and Off-site Development Agreement shall be implemented to insure the development and financing of the new road systems and related improvements. f. Traffic Impact Analysis: A transportation impact report of the trip generation and model distribution has been incorporated with in this submittal. g. Utility Provisions: The providers for utilities are listed below. Enclosed with this submittal are the required commitment letters for services as required by Weld County and the PUD development standards. I. Domestic Water: Little Thompson Valley Water Dist. 2. Sanitation: Individual Septic Systems. 3. Gas: Public Service 4. Electric: Poudre Valley, REA 5. School: Thompson R2J 6. Law Enforcement Weld County Sheriff's Department 7. Fire: Mountain View Fire Protection Dist. 8. Ambulance: Town of Berthoud 9. Highway &Roads: Weld County Roads. �,nu, rnuMnsw. h. Water Provisions: The development proposed to tie into an existing Water main that is located in WCR No. 3 The internal roads and culdesac's shall be serviced by new 6" water mains that will carry the necessary fire flows to meet the design criteria for the Berthoud Fire Protection District and related services per lot. Sewage Disposal Provisions: Shall be the responsibility of individual owners. 3. Landscaping Elements a. A landscaping plan has been implemented into this submittal package. b. A landscaping buffer adjacent to WCR #3 will protect and preserve existing traffic flow on WCR #3. The landscape buffer shall implement trees and berming to further screen the proposed development as required by the PUD landscaping design criteria. Additionally, as each lot is purchased and prior to obtaining a building permit a site plan review and landscape plan shall be submitted to Weld County Planning for approval to meet the design criteria for the subdivision landscaping requirements. Property to the east of this site shall be screened landscaping as required by the site plan review and approved by Weld County Planning Department. Furthermore, this application request waiver from the Ordinance 89 JJ of the Weld County Comprehensive Plan, that stipulates the requirement that all structures must be located no closer than 350 feet from an existing oil or gas well or any structure associated with the extraction of mineral resource. The applicant request that the PUD will deviate from this bulk requirement and ask to be allowed the building envelopes to be placed on the final plat and that the envelope be allowed similar to the previous standard for setback from oil and gas structures of 200' is met. c. This site proposes to establish a HomeOwners Association to maintain the landscape buffer, open space and road system. The Association (HOA) shall be responsible for maintenance and up-keep of the irrigation system, lawn care, plant and tree replacement, and road maintenance. d. A planting list is incorporated on the landscape plan that delineates the types and locations of trees and plantings that will be required as part of the PUD approval. e. The Home Owners Association shall be responsible for installation of a water meter, irrigation system and supply of said water service, maintenance and upkeep for irrigation of landscape buffers and open space. 4. Site Design a. The site slopes from the southwest to the northeast at a gradual grade of 2 to 3 percent slopes. The only unique feature to this site is an existing concrete lined irrigation ditch. The site layout utilizes existing grades and drainage features to accommodate the historical uses of the site and historical drainage features. b. This site is proposed Estate zoning, and is recognized and located in Comprehensive Master Plan. This PUD recognizes this parcels best use to be that of residential subdivision. This parcel meets Goalsi, 2, 3, 4, and 5 and PUD policies 1 through 4.5 of the Weld County Comprehensive Master Plan found in Section 3-11. c. This site and proposed zoning is consistent with the Comprehensive Master Plan. There are no forecasted conflicts at this time for the proposed PUD. d. None of the land located within this site falls in any hazardous areas or district overlays as adopted by Weld County. There is no geological, flood plan, or airport overlay districts in this area. 5. Common Open Space Usage 1. This site is a proposed Estate Subdivision consistent with the PUD guidelines. The site has a landscape buffer adjacent to the WCR #3 as well as open space adjacent to the existing irrigation ditch and surrounding sides of the subdivision that will assist in preserving any wildlife corridors and preserve native vegetation adjacent to the irrigation ditch. 2. The open space designated within this proposed development shall become the responsibility of the HomeOwners Association, (HOA property owners.) Maintenance and upkeep of the landscaping and native vegetation shall become the responsibility of the association and maintained in perpetuity. The construction and installation of the landscaping and support infrastructure for the open space shall coincide with the development of the lots, streets and support utilities. 3. A development agreement that outlines the on-site improvements agreement that will provide for the installation, permanent care and maintenance of the open spaces shall be prepare for legal review upon approval of the preliminary PUD/Change of Zone application. 6. Signage. 1. Sign District Regulations: MI signage shall comply with the PUD and Zoning ordinances as required by Weld County. 2. Sign Construction: All signs and components shall be constructed according to the specifications in Section 6.3.6.4 of the PUD Ordinance. 3. Design Provisions and Requirements for/signs in the PUD Zone District Prior to final approval and incorporated within the HOA covenants the sign standards for all signs within the development shall be included as part of any site plan submittal. Specific details such as size, colors, materials, styles of lettering, appearances of logo's, illumination and location shall be defined in said covenants. Design Development Consultants DEVELOPMENT SERVICES FOR THE COLORADO COMMUNITY December 14, 2001 To: Robert Anderson, Planner Weld County Planning Services 1555 N. 17'h Avenue Greeley, Colorado 8063 RE: Response to comments from staff review and revised plan sets. Dear Robert Anderson, Enclosed you will find the responses to staff comments and concerns. Additionally, our meeting with Public Works department and resolutions for access and traffic issues have been address within. If you are in need of further information please feel free to contact our office at your earliest convenience. r Sincerely, estgn elopment Consultants Don sr._ End.: Response comments Design Criteria, traffic counts Storm Water Impact analysis. 2627 Redwing Road Suite 350 Fort Collins,Colorado 80525 (970)266-0585 Fax(970)282-7123 Design Development Consultants DEVELOPMENT SERVICES FOR THE COLORADO COMMUNITY TRAFFIC ANALYSIS Section 27-2-50 Attached to this evaluation, is a table of the most current traffic counts for WCR No. 3. The current Average Daily Trips, (AADT's), as of 7-30-97 are 122 trips per day. With the proposed 5 lot subdivision that takes access directly off of WCR#3, the increase in total daily trips will be an estimated 50 daily trips per day based upon AASHTO's standards of 10 vehicle trips per day per single family dwelling unit. This increase in trips will estimate the daily total vehicle daily trips at 177 Average Daily trips. The insignificant number of trips added to the AADT's does not warrant any improvement to WCR#3 nor any additional off-site improvements. After meeting with Public works and discussing the above issue at length it was determined that the revisions to the site and placement of the bus stop and mail box pedestal within the new cul-de-sac location that concerns with safety and visibility have been addressed. Additionally, it was understood by public works department that the surface for the all weather road shall be gravel in nature and capable of drive lanes of 12 feet in width for a total surface area width of 24 feet. Bus Stop location for pickup. The developer has included within the cul-de-sac, a defined location for school bus stop that safely picks up and drops off children at the designated point as shown on the site plan enclosed. Section 27-6-30.F Street Names shall be selected as required by the post office in the region. Signage and street signs shall be installed in accordance with the Weld County Code. Section 22-3-50.B1 (P. Goal 2) The location of a hydrant will be placed on the south end of the cul-de-sac and each dwelling unit shall be located within 300' of the hydrant as measured via the street. Additionally, the minimum radius of 50' for the cul-desac turn around has been met. Road surfaces shall be designed to accommodate the imposed loads of fire apparatus and will be all weather in nature. Section 27-2-80 Each lot shall have the required 20' apportioned utility easement on the side and rear lot line of each lot. Additionally a 15' utility easement shall be placed on the front of each lot as defined in Chapter 24, Article IV and Sections 24-9-10 of the Weld County Code. Open Space/Landscaping 2627 Redwing Road Suite 350 Fort Collins,Colorado 80525 (970)266-0585 Fax(970)282-7123 Design Development Consultants DEVELOPMENT SERVICES FOR THE COLORADO COMMUNITY Section 22-2-190.D.2.b (PUD. Policy 4.2) The common open space of 4.7 acres (16.20%) that surrounds the residential lots of the Garcia PUD is intended for pedestrian and horseback riding uses. Additionally, the openspace is free of buildings, streets and driveways. The common open space is usable unimproved land for use and enjoyment by the community at large. Furthermore the additional buffering of the natural areas adjacent to the lots helps facilitate neighborhood unity and interaction. Section 22-190.D.2.c The HomeOwners Association will be responsible for the maintenance, taxes, insurance, liability and up-keep of the common open space. This will be addressed in the HomeOwners Association guidelines and included within the Development Agreement filed at final plat. Section 27-4-40.A.2 The landscaping plan has been revised to include botanical names, quantity and size of plantings. Additionally, all of the landscaping within the common area shall be the responsibility of the HomeOwners Association. Landscaping that die will be replaced at the expense of the HomeOwners Association. USES/BULK REQUIREMENTS/COMPATIBILITY OF USES Section 27-4-40 The intent of the developer is to meet the bulk requirements for the E-Estate lot requirements as defined in the Weld County Land Use Code. DESIGN STANDARDS/IMPROVEMENTS AGREEMENT/SUBDIVISION IMPROVEMENTS • Section 24-9-10 The required improvement agreement shall be prepared at the time of final plat submittal and entered into with Weld County at the time of Final Plat approval. The agreement will include the responsibilities of road construction, maintenance, open space landscaping and maintenance, utility extension, signage and any other applicable elements of the PUD. The applicant feels he has addressed all of the concerns and wishes to be place on the agenda for planning commission. r 2627 Redwing Road Suite 350 Fort Collins,Colorado 80525 (970) 266-0585 Fax(970)282-7123 Design Development Consultants DEVELOPMENT SERVICES FOR THE COLORADO COMMUNITY TRAFFIC ANALYSIS PROJECT DENSITY Proposed five (5) single family detached dwelling units Projected Average Daily Trips (ADT's) generated by this subdivision: 50 trips Projected Peak Hour Trips (PHV) generated by this subdivision: 8 trips Distribution of trips: 70 % north, 30% south. Total trips distributed to the intersection of WCR #3 and HWY 56: 35 trips Total trips distributed to peak hour volume at same intersection: 5 trips Distribution of traffic Flow at the intersection is as follows: 50%to the west, 50% to the east on HWY 56. Existing Traffic Counts (dated 1997)WCR& HWY 56: 122 Trips Proposed influence by new development: 50 Trips Total Trips with influence from new development: 172 trips Analysis: The total traffic volume from the influence of the new development is well within the design standards for Weld County and therefore no additional offsite impact or improvements are warranted by this new development. End.: Weld County Traffic counts. 2627 Redwing Road Suite 350 Fort Collins,Colorado 80525 (970)266-0585 Fax(970)282-7123 12/3/2001 • STYPE RNAME from to SDATE SDAY AADT AC 29RD 76RD 78RD 08/11/99 WEDNESDA 347 ---+C 29RD 74RD 76RD 08/11/99 WEDNESDA 216 _C. 29RD 68RD 70RD 04/06/99 TUESDAY 184 AC 29RD 70RD 72RD 08/11/99 WEDNESDA 129 AC 29RD 72RD 74RD 12/27/99 MONDAY 97 AC 29RD 74RD 76RD 08/11/99 WEDNESDA 216 AC 29RD 76RD 78RD 08/11/99 WEDNESDA 347 AC 29RD 74RD 76RD 08/11/99 WEDNESDA 216 AC 29RD 94RD 96RD 05/06/97 TUESDAY 48 AC 29RD 64RD 68RD 08/18/97 MONDAY 175 AC 29RD 70RD 72RD 08/18/97 MONDAY 197 AC 29RD 72RD 74RD 08/18/97 MONDAY 146 AC 29RD 74RD 76RD 08/07/97 THURSDAY 151 AC 29RD 76RD 78RD 08/07/97 THURSDAY 461 AC 29RD 78RD HWY14 08/07/97 THURSDAY 362 AC 29RD 68RD 70RD 04/06/99 TUESDAY 184 AC 29RD 70RD 72RD 08/11/99 WEDNESDA 129 AC 29RD 72RD 74RD 12/27/99 MONDAY 97 AC 29RD 74RD 76RD 08/11/99 WEDNESDA 216 AC 29RD 76RD 78RD 08/11/99 WEDNESDA 347 AC 29RD 74RD 76RD 08/11/99 WEDNESDA 216 AC 29RD 68RD 70RD 04/06/99 TUESDAY 184 AC 29RD 70RD 72RD 08/11/99 WEDNESDA 129 -AC 29RD 72RD 74RD 12/27/99 MONDAY 97 29RD 74RD 76RD 08/11/99 WEDNESDA 216 AC 29RD 76RD 78RD 08/11/99 WEDNESDA 347 AC 29RD 74RD 76RD 08/11/99 WEDNESDA 216 AC 29RD 94RD 96RD 05/06/97 TUESDAY 48 AC 29RD 64RD 68RD 08/18/97 MONDAY 175 AC 29RD 70RD 72RD 08/18/97 MONDAY 197 AC 29RD 72RD 74RD 08/18/97 MONDAY 146 AC 29RD 74RD 76RD 08/07/97 THURSDAY 151 AC 29RD 761W 78RD 08/07/97 THURSDAY 461 AC 29RD 78RD HWY14 08/07/97 THURSDAY 362 AC 2RD 39RD 45RD 03/27/00 MONDAY 309 AC 2RD I-76 391W 03/27/00 MONDAY 543 AC 2RD 39RD 45RD 03/27/00 MONDAY 309 AC 2RD 1-76 39RD 03/27/00 MONDAY 543 AC 3 28 30 04/13/99 TUES 76 AC 3 28 30 04/13/99 TUES 76 AC 3 HWY60 HWY56 07/30/97 WEDNESDA 122 4- AC 3.25 14 16.5 06/01/99 TUESDAY 528 AC 3.25 14 16.5 06/01/99 TUESDAY 528 AC 3.25 14 16.5 06/01/99 TUESDAY 679 AC 3.25RD 14RD 16.5RD 06/01/99 TUESDAY 528 AC 3.25RD 14RD 16.5RD 06/01/99 TUESDAY 679 3.25RD 14RD 16.5RD 06/01/99 TUESDAY 528 AC 3.25RD 14RD 16.5RD 06/01/99 TUESDAY 679 CONCEPTUAL DRAINAGE STUDY FOR GARCIA P. U.D. PREPARED FOR: DESIGN DEVELOPMENT CONSULTANTS 2627 REDWING ROAD, SUITE 350 FORT COLLINS, CO 80525 DATE: DECEMBER 2001 CONSULTING ENGINEER LOONAN AND ASSOCIATES,INC. 1630 SOUTH COLLEGE AVE. P.O. BOX 270852 FORT COLLINS, CO 80527 Zeman & Awe, lac, 1630 S. ediege due. P.d. Vet 270752 `%1t ease, ea 70527 (970) 493-agog 74Z (970) 495-9735 December 16, 2001 County of Weld Public Works Division 1111 H Street Greeley, CO 80631 RE: GARCIA P.U.D. Dear Sirs: Loonan and Associates, Inc. is pleased to submit this Conceptual Drainage Report for the proposed Garcia P.U.D. located south of State Highway 60 and east of WRC 3. Please review this Conceptual Drainage Report at your earliest convenience. We look forward to your comments and ultimate approval of the Conceptual Drainage Report. Please feel free to contact me at (970) 493-2808, if you have additional questions. Sincerely, i allaw Clad,'6SaC ateS; trine'• ""t`sn'�"�,�br,�i�� ' Qauo Recsr'� !/7 04%1..0• CNAHD ... bo O o James R. Loonan r • •• G�.,,,,. .��% "Ii Iunuuun�0• General Location and Description A. Location The Garcia P.U.D. is located in the Northwest 1/4 of Section 6, T 4N, R 68W of the 6th Principal Meridian, Weld County, Colorado. More particularly, it is located southwest of the intersection of Weld County Road 3 and State Highway 60. The site is bounded on the north by State Highway 60, on the east by WCR 3, on the south by agricultural land and on the west by agricultural land. The Lake Ditch is adjacent to the northeast corner of the site and the Home Supply Ditch is adjacent to the southern boundary. B. Description of Property The Garcia P.U.D. site consists of approximately 29 acres of gently sloping ground. The existing vegetation consists of agricultural plants. The existing ground slopes northeast at approximately 1.6% slope. The existing runoff from this site either drains directly into the existing irrigation canal or into the existing borrow ditches for the State Highway and County Road 3. Both borrow ditches currently drain directly into the Lake Ditch. The Garcia P.U.D. project consists of 5 lots that are to be developed for single family-residential use. The development will include the construction of a turn-around to allow access to the lots. II. Drainage Basins and Sub-Basins A. Major Basins Description The site is within the Big Thompson River drainage basin. The entire site area will drain into the Lake Ditch. B. Sub-Basin Description For the purpose of this conceptual drainage report, we place the entire site into one basin— Subbasin A. We also place the entire offsite tributary area into one basin— Subbasin Offsite. The offsite tributary area consists of approximately 13.7 acres. We assumed that the Home Supply Ditch would not intercept any of the offsite runoff. .---.-74e,—;---i- ——•a.7,-. r - . _ _�.Y,,.r::.r.,wr,, 3_ -- ' r1�'•sv' -At i 1 AEI.; �f, k L y4• .. )..1 1\\\.. s.. a m' i 4..• t_ R'. .._ _ .y_•_'(iLa�.� —— `�— — ——,�•— — i _:e/��;sir,�. t' _.wee 4' /..,•,•-v. . if i'L'•* ) i • ' •.' it.: r r :riiiiivr ''..." :.? •• invEr-LN6:;`:...-....:."- = . -..._. -.-,-,..*:_;..1 - .-""t- • ,....-17. . •. :: . : .-.??.:i ,:- •',1'..; N 2', 1 , '� �. _>�s�, - .....a. iii,.t •K: -- - -` �- 1 1-t , R4. E )_� 1.t'.� V1•..,,,:4 ,•-.. . i "" . • ., . T......t, ' I ., I • 1 -.:i I I i i iN.iclialfw... • 1 • �. 1 1 601, r __ ...... •Y..• -- ...."1. ter. I r ' 7 - t.. (" 1 • r•1 t t•...• I .._... 0 .1 . . i l ii.1 ' • _ ' - _. , , - - • - Mil•1,...ime i.7 . 1 r. i .EI'I. 1 - r— . • - - • Mee .•. •— :n •fe. ?' ..: 13 M le .,,,, • f .1 C. • l{{ '; •1 •1 ...... 1.7.".••.....:9 . .... • : •• ...lc ,•'-•:':....^-:"."..1****:.: .4 41 "' \:-.. 'ilr,:vial;H. ';'''''---:. .-......... '.I . i. .. . t ". / I .. 10° E .: arm m i t ri ....„,•.. Cooxiaht(C)1997.Moolech_Inc. III. Drainage Design Criteria A. Regulations The City of Loveland—Public Works Division's Storm Drainage Criteria Manual was utilized in preparing this report along with the Weld County allowable historic release rate. Loveland's manual was chosen because the location of the project is close to the City of Loveland. B. Hydrological Criteria The two-year event was used for the minor storm event and the 100-year frequency rainfall was used for the major storm event. The Rational Method was used to calculate flows. IV Drainage Facility Design A. General Concept The proposed development should be designed to maintain the historic drainage patterns. B. Specific Details Each lot will be constructed such that runoff will be diverted around the building structures. The historical drainage patterns can be maintained with only minor diversions. The ultimate design point of the Lake Ditch will be maintained. V. Conclusions A. Compliance with Standards This development is made up of lots intended for residential use. From the calculations in the Appendix, it can be seen that the development will produce a small amount of additional runoff. We estimate the increase in the 100 year runoff to be less than 1.0 cfs (less than 2% increase). Therefore, we do not recommend requiring detention ponds. The detention ponds may cause more nuisance problems for only a minimal affect on the downstream facilities. VI. References City of Loveland Public Works Division Storm Drainage Criteria Manual 2 APPENDIX .1 r l ` on walx `f\� r / r ""/ l I r ITm f 3i �� ._.,� AKE a `i- ^al �.. �lcc Y r II i,': / I • "-------,.. 7 • S;, , ,,? 1 • \P -------1---__ O —. `' I__ „ ;; 4 II e •' SOH i II l 1. • \� u s�rPtr J � �- / 0 1 - ~ - �I '«r a_�_ 5 _R 8 4-5 :_/"-"r:c_/-1"---- ,------ I \/ o �„...—, i i H : r f"" •' _ -- �� — • 5,. 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JRAINAGE CRITERIA MANUAL TABLE 601 RUNOFF COEFFICIENTS AND PERCENT IMPERVIOUS LAND USE OR RUNOFF COEFFICIENTS SURFACE NDASETORISTICS PERCENT FREQUENCY Business : IMPERVIOUS 2 5 10 100 Commercial Areas I 95 Neighborhood Areas .87 .87 .88 .89 I 70 .60 .65 .70 .80 Residential : ---Sing- e- amity I Figure-603 .40 .45 .50 .60 Multi-Unit (detached) Multi-Unit (attached) 70 50 .45 0 .50 .60 .70 1/2 Acre Lot or Larger 30 .65 .70 .80 9 Figure-603 .30 .35 .40 .60 Apartments .70 .65 .70 .70 .80 Industrial : ig t real Heavy Areas 8O, 90 .71 .72 .76 .82 .80 .80 .85 .90 Parks, Cemetaries 7 .10 . 10 .35 .60 Pla_va_rounds 13 . 15 .25 .35 .65 ^ Schools 50 .45 .50 .60 .70 Railroad Yard Areas 40 .40 .45 .50 .60 Undeveloped Areas : Historic ow nalysis 2 Greenbelts, Agricultural (see "Lawns") Offsite Flow Analysis 45 (when land use not defined) 43 47 55 .65 Streets: Gravel 100 .87 .88 .90 .93 13 . 15 .25 .35 .65 Drives and Walks 96 .87 .87 .88 .89 Roofs 90 .80 .85 .90 .90 Lawns , Sand Soil 0 .00 .01 .05 .20 Lawns, Cla a Soil 0 .05 .10 .20 .40 NOTE: The Rational Formula coefficients do not apply for larger basins where the time-of-concentration exceeds 60 minutes. WRC ENG REFERENCE: US0CM DRC0G Rev. May 1, 1984 -629- LOVELAND STORM L.4AINAGE CRITERIA MANUAL 1 FIGURE 601 OVERLAND TIME OF FLOW ■Ucw.■ = m ■ u .uv. - , P%SOmOImill■■■// 'MOOR -I . lal m i .im i ■//■ b0 ' 400 ■u■■■/■■\/m■uw■ M. Mu a. 'MIMEO�. .'- ■ C .wa..uw..w.wmM■.tl■■..■■..\wwwwr.r.■a\..ympa .■\■Ii • .■m■mrwl... ■%i W J/./.lmal.■lrlm ra\. a.I.ra■lrll . n660. W ■I)■■a.■I■■.n�.■■.a U. r - • 00 ■■r I■■1�■�O.o A■■6I - I/■■r1 1� hrara . Ia.a\l a :u W m..u■.\m\Y■U■.w■...../•Ira..._ ....N•r .ns�a.C•' Annum- 4.1 RR Z ' . - amt mlrrtlmr ■ Q =� v mIIN/I. 0 H r.ra.■mAramm■ram■■nra■ara■ C.s•� /. ■ W Mira 100 ■■■.U■mill %%.■Aa/rA/■.lI/pa■/■.�y/\t./■\■R.m■ .(n • n..un/a ■....■.a....■w.%%NNa..aw...I.■I...Va..w.■m■Wmw. G--..■■w■■.au.■■r■..u■ 3° 2 i ar ■/■►1■//■:.//u• a■/.f.!a1i Amlr%i■r■u .mar./alU■/mm..m■m I.Ia■a JUM■. aim ■. I.-- „.4* a ■ ■m■!. ■■..� - - !SOU aramml.l■SM/... 0 !� m 1 Ii./au■.Cr _c.IMPARRIRMSSIMOSURA•...am: .m■■U.■....■m.. wr.aGUll a■a■■■■wrnirr.!a..a.rwawa..a..- 5_n.', a:■.air•■m!.auauataMm . as Gi.P%■.a....rmMMMMM!. �i■■NaU■ C7-.9° ■r..■■U ■%'�Iaga!a■:a.aalmmaiam mmill.!- _ %:riram5 s sMm.m■m MOM 6660, ESIMISEMIMEn'aaniVire=.151.="..." ID aa:AtalrS -aa■Y \ , a:ar:Laa ' r -- P M ■ 0 THE ABOVE CURVES ARE A SOLUTION OF THE FOLLOWING EQUATION: ti _ 1.8 (LI - Ca) -/r_ � ? where: ti= initial flow time (min.) S = slope of basin (%) Ca = runoff coeficient for 5 year frequency (Table 601) L = length'of basin (ft) Notes: I. The curves are for use with the Rational Method; see Text Section 602. 2. The curves shall not be used for distances in excess of 500. . WRC ENG. REFERENCE: "Urban Storm Drainage Criteria Manual" DRCOG, Denver, Colorado 1969 -640- • I - LOVELAND " STORM DRAINAGE CRITERIA MANUAL FIGURE 602 TRAVEL TIME VELOCITY FOR RATIONAL METHOD SO 30 I 1 b. 20 c Z o W r o f 0 I I r 714:1 e a 10cC tu I ' �� a _ \4'er l�� 0 v O �� O a. - " n / 3, ef S e° I�� .c �� v 41 e 3 ` W a.U' „ ? 4 y� COe 4,O a CO 3 '° � , y h + ri 4v .r? 4 / Ve lit it 4. e 4.r O 4r O oe ' L. _ =4 U 2 3 3 oe y W y ir0 41• A4.r W ..•••••••• 3 40e 4r r 1 4 4 40 aQ .5 .1 .2 .3 .5 1' 2 3 5 I10 20 VELOCITY IN FEET PER SECOND I i WRC ENS, REFERENCE: I -Urban Hydrology For Small Watarshads" T echnical i Reins. No. 55, USDA, SCS Jan. 1975. _ALI_ LOVELAND STORM DRAINAGE CRITERIA MANUAL l TABLE 502 DESIGN TOTAL RAINFALL AREA II - LOVELAND 2hr-5mIn Storms NOTE: All Rainfall Values are in Inches TIME 2-YR 5-YR 10-YR 25-YR 50-YR 100-YR 5 0.29 0.41 0.49 0.59 0.68 10 0.45 0.64 0.76 .20 15 0.57 0.81 0.92 1 1.34 1 1.52 20 0.66 0.94 1. 2 1 11 .316 1.54 1.58 1.12 1.36 1.54 1.78 25 0.73 1.04 1.24 1.50 1.71 1.98 30 0.79 1.12 1.33 1.61 1.86 2.10 35 0.83 1. 19 1.41 1.70 2.00 2.30 40 0.87 1.25 1 .48 1.78 2.10 45 0.91 2.39 1.30 50 0.94 1.54 1.85 2.18 2.47 1.34 1.60 1.91 2.25 2.54 55 0.97 1.38 1.65 1.97 2.31 60 1.00 1 2.60 65 1.03 1.44 .69 2.03 2.36 2.66 70 1.06 1.73 2.08 2.40 2.71 75 1.08 1.50 1.79 1.76 2.16 2.44 2.752.16 2.16 2.48 2.79 80 1.10 1.52 1.81 2.18 2.52 2.82 85 1.11 90 1.12 1.54 1.83 2.22 2.55 2.85 1.55 1.85 2.25 2.58 2.88 95 1.13 1.56 1.87 2.27 2.60 2.91 100 1.14 1.57 1.89 2.29 2.61 2.93 105 1.15 1.58 1.91 2.30 2.62 2.95 110 1.16 1.59 1.92 2.31 2.63 115 1.17 1.60 1.93 2.32 2.97 2.64 2.99 120 1.18 1.61 1.94 2.33 2.65 3.01 WRC ENG. REFERENCE: Larimer County Storm Water Management Manual, FEBRUARY 1979 -s064 - • LOVELAND STORM DRAINAGE CRITERIA MANUAL I FIGURE 502 • • • RAINFALL INTENSITY - DURATION CURVE O co c D V Q 2 el W o o Z IX a. li O Q VI2W0 0 • W 0 F J - I- < Z DQ y�U In Z wt -I upIse PI p C J O- =w 2 I- (...) N � UO a Ia.H o Z — E— z = • 0 41 V) cc QNQ> 2 Z p 4 N FN Q. I- LL QJQF N Q }Q � --J — �", 2 Q U F 0 2 in ^ J Q 0<�W o i J Er W HQW� M , a miccz C • M Z .� _ Op Q ail z LL Z O O m F Q Cr J 0 • Et H N P AV PP o pP e IC P ' Nh 'P I so M N ( loop aad sol oul ) AlISN3INI 11VJNIVN I • WRC ENG. I REFERENCE: -509- Hello