The URL can be used to link to this page

Browse Search

Home My WebLink About20083060.tiff • SKETCH PLAN DRAINAGE REPORT FOR SERENITY VIEW ESTATES P.U.D. Lot B of Recorded Exemption 0705-05.3 RE 3684 South Half Section 5, Township 7 North, Range 67 West of the 6th Principal Meridian Prepared for: Mr. Robert L. Buderus 2932 East Vine Drive Fort Collins, Colorado 80524 (970)493-0130 • Project Number: 1009-0601 May 10, 2007 Prepared by: Mr. Jeff Couch, P.E. TEAM Engineering 3468 Shallow Pond Drive Fort Collins, Colorado 80528 (970) 231-9937 • 2008-3060 TEAM Engineering 3468 Shallow Pond Drive Fort Collins, CO 80528 (970) 231.9937 • May 10, 2007 Mr. Roger Caruso, Planner Weld County Department of Planning Services 918 10Th Street Greeley, CO 80631 RE: Sketch Plan Drainage Report for Serenity View Estates P.U.D. (PZ-1131) Dear Roger: We are pleased to submit this Sketch Plan drainage report for the proposed Serenity View Estates P.U.D. • We have maintained existing drainage and irrigation patterns within this project.. We have also added a detention pond and all runoff is directed towards this pond outlet located at the southwest corner of the site. This concept eliminates runoff which could impact downstream properties. Please review this information at your earliest convenience. We look forward to working with you on this project. Sincere /ill J ouch, K.E. Cc: Robert L. Buderus • • PROFESSIONAL ENGINEER'S CERTIFICATION I hereby certify that this Sketch Plan Drainage Report for Serenity View Estates P.U.D. was prepared by me in accordance with requirements outlined in Section 24-7-110 of the Weld County Code. 1 1 ` t J C • :L Jeffrey W. Couch Registered Professional Engineer State of Colorado Number 16584 • • TABLE OF CONTENTS Section 1 General Property Information A Legal Description B General Location C Description of Property D Adjacent Developments Section 2 General Description of Proposed Subdivision A Area B Ground Cover C General Topography D General Soil Conditions E Irrigation Ditches F Drainage Way Section 3 Drainage Basins and Sub-basins • A Major Basin Description B Sub-basin Description Section 4 Drainage Facility Design Section 5 Erosion Control A General Concept B Specific Improvements Section 6 Conclusion Section 7 Appendices • LIST OF FIGURES Figure 1 Vicinity Map Figure 2 Regional Drainage Patterns Figure 3 Proposed Subdivision • SECTION 1 GENERAL PROPERTY INFORMATION A. Legal Description The property is described legally as Lot B of Recorded Exemption Number 0705-05-3 RE 3684 Located in the South Half of Section 5, Township 7 North, Range 67 West of the Sixth Principal Meridian, Weld County, Colorado as recorded at Reception Number 3154844 on February 18, 2004. B. General Location • The property is located just north of Severance, Colorado along the north side of Weld County Road 84 and 1200 feet east of Weld County Road 15. The most direct access to the site is provided by taking Colorado State Highway to Weld County Road 15. Then traveling north one mile along Weld County Road 15, a paved road, to Weld County Road 84. Then proceeding east on Weld County Road 84, a gravel road, approximately one-quarter mile to the site. There are no other public transportation facilities located in this area. (See Vicinity Map.) C. Description of Property The property is a vacant parcel of property with a native grass cover. The property slopes from east to west and has not been cultivated in over ten years. The area is typically rural in character although several minor subdivisions are currently proposed in the area. The Cactus Hill Irrigation Ditch runs along the east property line. • D. Adjacent Developments • The project is currently adjacent to vacant parcels to the east and north although a nine lot minor subdivision has been approved along the north property line. This subdivision is proposed as the Sorrel Ridge P.U.D. Two large parcels with single residences are located to the east. Immediately to the south are several irrigated agricultural parcels. Prairie Ridge, an existing nine lot minor subdivision, is located to the southeast. SECTION 2 GENERAL DESCRIPTION OF PROPOSED SUBDIVISION A. Area The parcel contains 59.38 acres. B. Ground Cover • The parcel has not been cultivated in several years. A sparse ground cover of weeds and native grasses currently inhabit the site. There are no major trees or shrubs located on the property. No wetlands or ponding areas are located on the project. C. General Topography The parcel slopes uniformly from east to west at a slope of approximately 2%. D. General Soil Conditions The soil is classified as sandy, clay loam. These soils are stable and conducive to residential development and individual sewage disposal systems. No evidence of erosion or geological disturbances are located on the site. • E. Irrigation Ditches • The Cactus Hill Lateral runs along the east boundary of the parcel. Serenity View Estates P.U.D. was historically irrigated from this ditch. Property to the east is higher than the project site and could not historically be irrigated from this ditch. Two head gates, one in the middle of the site and one at County Road 84 divert water for irrigation purposes to this project and to property south of County Road 84. It is anticipated that the Cactus Hill Lateral Ditch will be replaced with a pressurized pipe system within the next three years. F. Drainage Way There are no major drainage improvements in this area. Runoff was typically sheet flow and traveled from east to west towards Weld County Road 18 and Weld County Road 84. Roadside ditches intercepted the flows and conveyed them to natural drainage ways west of the • project site. (See Regional Drainage Exhibit.) SECTION 3 DRAINAGE BASINS AND SUB-BASINS A. Major Basin Description The major drainage basin is located along a ridge line which runs southeasterly between Wellington and Severance, Colorado. Serenity View Estates P.U.D. is located on the west facing slope of this ridge and runoff is tributary to the Cache la Poudre River. This area remains primarily agricultural with sparse residential subdivisions. Historical runoff pattems are maintained in this area. • Because Serenity View Estates P.U.D. is located near the existing ridge line, there are no • flood ways or flood plains identified. The Cactus Hill Lateral runs approximately 1,000 feet below and parallel to the ridge line. Historically, flows from this upper area have been intercepted by the ditch. Future plans for the irrigation lateral are to replace it with a buried pipe which will allow runoff to run unimpeded from east to west. B. Sub-basin Description Historically, runoff sheet flowed from east to west in this area. Flows from the project site ran to the southwest corner of the site. Flows continued to the south, however, there is no culvert under Weld County Road 84 and no definite drainage route is evident in this area. Approximately 24 acres of area above the irrigation ditch run towards this site. These flows were intercepted by the ditch and conveyed to Weld County Road 84 where flows spilled into • roadside ditches. It is proposed that these flows be routed through the subdivision. SECTION 4 DRAINAGE FACILITY DESIGN CONCEPT As a large lot residential subdivision, it is not anticipated that overlot grading be completed. It is also anticipated that all historical drainage and irrigation patterns be maintained in anticipation of a future pressurized irrigation system. These assumptions result in the following drainage requirements. 1. Upstream runoff collection ditch 2. Lot line swales 3. Road side ditches • 4. Detention pond • 5. Outlet structure 6. Modification to Weld County Road 84 to facilitate runoff to natural drainage swales It is important to note that property to the north, south and west of this site do not drain onto the site. Runoff from this project does not impact adjacent properties. The installation of these improvements will convey 100 year flows to a detention pond /control structure which will eliminate major off-site impacts. The control structure will release runoff at a five year historic rate which is substantially less than existing flows. All collection swales will be dirt swales with appropriate erosion protection. All pipes under roads and driveways will be corrugated metal pipe. The outlet works will involve a concrete outlet and water quality structure. Since overlot grading is not anticipated, roadway grading will conform to existing terrain slopes. • Maintenance of these facilities, including mowing, cleaning of pips and structures, repairing erosion problems and stopping encroachments into easements, will be provided through a Homeowners' Association established as part of the project. SECTION 5 EROSION CONTROL Temporary erosion control measures will be installed with this project as follows: A. Silt fence will be installed along downstream property lines. B. Wattles will be installed in all swales to control runoff velocity and sediments. C. Proposed detention ponds will be graded and utilized as temporary sediment holding facilities. • D. Gravel filters will provide detention pond outlet protection and protection of all • inlets. Permanent erosion control measures will include the following: A. Roof and pavement covered areas relating to the building construction. B. Grass and rock cover installed in open space areas. C. Detention pond will include water quality outlet boxes which will provide an extended detention design. SECTION 6 CONCLUSION Since this project is located close to the top of the ridge line, off-site impacts are minimal. The project will accommodate off-site flows from the east and on-site flows through a • system of roadside swales to a detention pond. This control structure will store increased runoff from rain events. An outlet structure with orifice plate will reduce runoff to a five year historic rate. • ' v cyr N ��. � / ��_ �-_ II \��... -....._ Li71ie ------/ p3a �I, 5/9,, S,,..? sz�s_ -� - -\ ��--Si:A �� _'� fl \ icl -°55---1,_,--2; 33 \2 a< �� \ ) I ,ham 5)6� � /-\ { 083 5129 �� C-2, .V �. *tx,N , i' Sorrel Ridge � � Serenity View, y \ I 0 84 Weld County Road }/ ra— '—� I ', 1 s,.N.� . Prairie Ridge \ ` \ \ -Th 5,39 ,..-.-59, I \' O<6 50,97 ‘99-99-9 \ , - / 8 K.�' ��' Saddler(Arena _ - I tri, i - :, I i -K.114 9 :' - 1''C' REGIONAL DRAINAGE EXHIBIT J SC)"r, / I. �j.c 3! I I f lino ` 1 WY al ON AMA • C 'Y'11'd 66316311,1111 M3IA AlIX3X34 p 9 Willi.t—V u0 ill 1. snnaans'Ima n `� e Pin aE ,E C € _ Ink U U _ ;, // d Mr' F>, W� � ,/ Ili; z v�, — � -- 1 Is .vI : ,. Ki= N. v� 5® , i9{ L� ill � l\ jr. i• yp A Rye .I 1` w_ 2 ® U FQ ee I g II III i�_ _-o d Yt@! ix}§@ 1 \ r�r r t as I I i i / 6 IIn .„,/, ,. / I III sI ,u i iri II I 4 .\ ' ! f f� I'I I e a �`! ® Ivit II g L P 'Eh .t VLJ zx��' F.,. J e 5j5 s t Eh • nJ I ! E I Il �E$ z.scz, MAO 4 { 54 a3= €alaiII "n • I5er�nt I/ 1116) Fs fa f,9s 9 1 4 80510 504 Mail Nom 1} (ron - 5166 � fJ/e9 = 57,38 f(/CS Un e✓M1�e9 - q'$S CHUM yap Of - 'o57 la /v/3 ° y y I 0 i v°/arr rcyl' ?,oi v sao °WI*, flaw 1ao' S-Aei%w rha,n/ fin, Po Deff/Iiton nod 55usr Fsfedhs{,1 fo Deir/moze flail kilo De/etfior fed Pd riri'-1 C lot(r V' J Vi if✓11 ay, i wet % = 2 /4t t`0.l TA ko 5' 7 p C $ori CS= 0. )70 , Cwd 0 51 Aeviiell. TO 1,3 SF b= Zalo (5. = [L Z7Z cod ©.S5 fir tvf 70% V= 2 4 I Sec 00 ov-e/14,( T = 12391 (LI- au ) ifsr _ B,2,/ = 307,3 ffr i*: 0? D3-) b,7I • final ew Crcw:?/ 7c = nc'9 1 _ 14 1 (1, ,Z (ba) Jv{a! T = 44 4 Kith • /� �K / �# as- � 7y ( 1/ : S 2) \\ l ) : ),2115 : ( J ` S % St ( Y ) : @? & Q O 4hz S - 0,5s) (i?) (57 ) a k J SI} U1 ESuediv § / U )1 » Y & / &J` • r 214 7z / / §/»c \ » firA \\ 7/ k /3 @s Row 4r 2z§ r • • got) 8 (off- am - ZIf 0 /1r(P,f Iln/J?t (1 c1/QZ &!/P1 L = ,o5-0 • that = lalz - laoo = I2 � 4e/Qag 5199€ = l N • 3s/Sl4 I} Bgjin II (aye1incJ flay /ah Uetenitoe fon) C ( ; 00.170 C)Q8 0 5/ (471eitirl = 0'.172 i 0-51 notirti ae7 114 rc 5 11Y w V = I 1 {I/Jet 105p = 1( 7 Ili/ • A S (a) I� Hisfmrira( Flow = (0%17) 60 ( 2,0 ) = 13.7 C(1 • µ/ DJenIi a iflud (Pall/44972 i30)14r, h f ai rQ/,e4 = 83,28 nr/eS C= 0272 C yi /} _ gin }; an = 22.62' 1471( bleat( )5Q.S II " 16.2 bR13r 8 1.3,9 = ?7, / zfs I?me (4) (it) (X6- L Q1 V 0 w I LLV i'iirr) lrEs) (aft: ch (6f;) (OR) s 300 ZZGS 9-al zo9. 6 6z, s69 2115 8,250 Sy]01'7 to 1o0 710 163.3 77,770 17, 0 8o,za'o I 900 2 6-° 13)-1 129,110 7h,03) 97, 560 to Ieoo 5,3`/ 16,I Iy5; 320 35,`IV lot 9Zo ZS 1590 1171 107.7 141, 550 1623o 117,300 30 /Boo y.70 9s3 171, Y6) D,loo 118,361 Jr z00 3,7q rig 17,6 v,75-o t 5 70 y e--- Y0 Z3oo 351 iffy 9s, 411 7r,':r'g:° 119,61/ YS O00 3,77 716 701, 966 71,4O RI:Bin. 9 zoo; 3of al tot szz FE,Soo 119,ozZ 5 3370 ZZ" 6Y-Y 212,557 `7,JO 115,,2 06 40 340o Z`6 40, 5 z,17, 18'1/ 106,zso I1p1r 70 7200 2-36 S3.1 22y,k0Y 173,90,0 /09, 70y s'o ifrea 2.12 JYf16o0 sr 5(0D 197 157,300 i b0c0 1.71 171000 • I 1 'II APPROXIMATE SCALE IN FEET 2000 0 \T 35 µ' II , RATIONAL FL000 INSURANCE N10RR1N1 S s \ I ,1 I�, II FIRM ',- ' / I) " II, �l' FLOOD INSURANCE RATE MAF Jd a E / ₹ �I I _ WELD COUNTY, x ',I '' -4I COLORADO N I Iq II I I ' (l1NINCORPORATE AREAS) \ �d= iI"^ sTl III I PANEL e 47e5OF '015 I A. II R , III ! COMMUNIT1-PANEL NUMBER i� C L 000255 0415 0 � � MAP REVISED: Ip\ CI ' SEPTEMBER 22,1999 3 T� Z Fi 7"/ ,------__/ __ I II Federal Emergency Rluupemem A9enry S l I R nm➢ce'copy al pow cn was no en.e npcµ r Op vaa.e eeID tee en mace eueeeceer„p teedote on es or eolith IL — Paean,aoo m cheer nee ro et yeerim temma Oita Nock Foe the el c�NAFaaM Mao ante • wllU EI7L Lillie c 12 �Feserroir NJ ZONE C I --.� Pouare Veit e Canal 2 33 I �h ip— r' ill iN ,—\ 7 ,I H I\ 9 y ll I G \, I J I \ I,I�AJ 11 ' Il A\ ----1, I' N WII; IA �_ _ / l \C � / \v6 i----..,,�� ` \ ;\ �� I' ZONE C e°� �� c� ,I �� \\ �';�v I D; KLWER i s�, err Hello