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Home My WebLink AboutLITTLE CAESARS PUD PRELIMINARY - 28 92 - SUBMITTAL DOCUMENTS - ROUND 1 - DRAINAGE REPORTi PRELIMINARY STORM DRAINAGE REPORT FOR LOT 1, STRACHAN CONTINENTAL SUBDIVISION, SECOND FILING Prepared for MR. TONY FONTE Prepared by STEWART & ASSOCIATES, INC. MAY 4, 1992 COMPUTATIONS James H. Stewart & Assoc. Fort Collins, Colorado By: P A. L Date Client: M rc. �! f / (. F., :� Sheet No. of Chkd By: Date Project:,',-ren A Co T,e'-„ rl, Job No. Subject STnP M L7� q/,VAC^ E CAc...c UL.AT/cx,, �7-Z G7--Age s A l,G iIG, c.=o9s ram. f0 / I bE" v /�: ZS (. JS) (7, /) i _.._...___......._-.-. TO. T:AL �UNOFF /io2.DE vECOP.ED O.7'4.L ..l2 v. c:oF � �... � /00.16AP- DEv...S%7'L � � 70, S-c = s, 0E-F= SITE .1�!,t? -A % fi- l/•3AC, C=O.Z Tc= 80 Ht/N, L=O.75 a y A D D/A)C, T P /?,E:: ¢.G Foo-- C- v c: //u G T'E o/V 7 C� ./ScA,v�1 CA,/ J, F: ,c. IDAp_.rLv�y �\/J D IV cp_S' E 7-,'70T/1 .k 0ACU L15 T,j -r LOt,J CU �. t`i CU A, C' .p ,k, C. C� :ON THE /SC-f'�/J� J '7-YE A:•1GU dJ7 C'F !'C UNp F� _. . IL'-EAr— IV 2,. .7 E--.. lr:•0-. Ft'�r 77 ... LNLE.T. AT . Tf/C ..: __. .. :.. G," J. /F �", /�'n".CKcuA/ A fJD 110.C3SETCC7H LVAS P_r-U vC.E 7> Ti�L AND i�P_,I//u /(P_E-f, i'r�oDvcF $.S G.F.S. wN/c/v cn lE cTr k_ .= v.�Er..- Lo // OS�EA�VA7or. f/(EIrn//TS _ ,q ctz"s A v a lrJCvcv Yt:_ C G E 0. 4 G.F.S, r r Tf ! TEE S IJLET--.. L CCL.D .ACcE -7-. TH/S TrlE Mo yEitifcL IcU/UG1--F 1-1.)1LL '-LOLU u A S T O T/i E /V G C T io c ,-'S 7" C_ G. /✓ 6 !� � F ? h% ?'F_ :' / <: � T� ? T WILL OvC"Fc 12k/.41G.- Lo7' Cc,i!- ES A 7 7hlE_.,..L'V.IL.D/vrc .TGoO�.._E vg7%O.LU . FP,,; _AScvE_:_ • !" C.O c(.r Ei L lS (/� %%,/.`^r'-f� /l/L7 Y (',C-✓i,i(-". Dq /.Ir (^� LU/l..L OCCU.0 . p: "U5 �%-� z� TTa�; t Q .) WINDA4,41 V) 9p 7's c E D 7 "pre, fv, hill 1.5 39/1 CoNtl 6,'dZ,9 Cl TROD ?IAN PAVY-UAY EAC.r No�sETOOTM /LOAD. y I I I I r [ o. � ..• \ \ e n° e...� � s ;try � \ �`? � A(/N AREA Al F ri ZI 1 I S 1 \ 1 J. .J ar n.r us v ll♦ D�a,NlA� IIii \ Olt—1 i 1 a 1 I ru. FL�na 5°u .DP-AW A,e 1 k y ,.4a�. Ea DRAY\) AeEAZ 1114 \ \ - !'1111\\\ � 1 . \ '�"{\ \ Fr v. FCooa.•3o23 l . � noio- 1 DP-AiN fl eEA LI \ 4a \ 7v No Text 0. STEWART&ASSOCIATES Consulting Engineers and Surveyors May 4, 1992 Storm Drainage Utility City of Fort Collins P.O. Box 580 Fort Collins, Colorado 80522 Gentlemen: This is the preliminary storm drainage report for a proposed Little Caesar's Restaurant and a small office building at the corner of East Horsetooth Road and Mitchell Drive. The site was originally to be Lot 1, Strachan Continental Subdivision, which was approved in August 1981. That subdivision had three lots, and the utility and drainage plans were completed for all three lots and approved by the City of Fort Collins on August 21, 1981. However, at the last minute, Lots 1 and 3 were deleted from the subdivision plat and only Lot 2 was included on the filed plat. Lot 2 has the two large office buildings at the corner of East Horsetooth Road and J.F.K. Parkway. The utility and drainage plans and the storm drainage report included Lot 1 which is proposed for development at this time. A copy of the Storm Drainage Report dated July 3, 1981, is included as a part of this report. Lot 1 contains 1.26 acres, and Mitchell Drive has 0.49 acres. The original Strachan Continental Subdivision contained a total area of 9.6 acres. The storm drainage system was designed for the runoff from the 9.6 acres and the historic runoff from 11.3 acres offsite. Mitchell and Co., the developer in 1981, negotiated with the Warren Lake Reservoir Company to provide detention in Warren Lake for the 9.6 acre subdivision. There is no onsite detention provided. The utility plans were approved by both the Warren Lake Reservoir Company and the Larimer County No. 2 Canal Company, The storm drainage system was designed for the ten-year frequency storm and consists of 24" and 30" concrete storm drains along J.F.K. Parkway and a 15" concrete storm drain running West, along Horsetooth Road to the existing small parking lot east of Lot 1. Three 30"x19" oval pipes carry the ten- year storm diagonally across the Horsetooth-J.F.K. intersection. The storm water then flows through the Marriott Hotel storm drain system which crosses the Horsetooth-Stanford intersection and then flows into Warren Lake. The runoff from Lot 1 will flow on the surface to the existing 5-foot curb inlet at the Northeast corner of the Northwest parking lot on Lot 2. The storm water runoff from Mitchell Drive will flow to the existing 4-foot curb inlet at the Southwest corner of Horsetooth Road and J.F.K. Parkway. James H. Stewart and Associates, Inc. 214 N. Howes Street P.O. Box 429 Ft. Collins, CO80522 303/482-9331 L Preliminary Drainage Report Lot 1, Strachan Continental Subdivision, Second Filing May 4, 1992 Page 2 The quantity of storm water from the site in a ten—year storm is 4.0 c.f.s., and the quantity of storm water from Mitchell Drive in a ten—year storm is 1.5 c.f.s. The storm water calculations are included as a part of this report. The preliminary grading and drainage plan is also included as a part of this report. It shows existing contours and spot elevations and proposed spot elevations. It also shows drainage arrows depicting direction of flow. A silt fence will be constructed along the East line of the site to intercept any silt from entering the existing driveway. Also, a rock filter will be constructed at the existing inlet in the existing parking area on Lot 2. If you have any questions regarding this report, please call. Sincerely, G . L Richard A. Rutherford, P. & L. S President jrr enclosures W, COMPUTATIONS Stewart & Associates, Inc. 214 N. Howes St. Ft. Collins, CO 00521 (303) 482-9331 By: RA L Date S ! Client: Il Ly Fo,vTC Sheet No. of Chkd By: Date Project: L o T LoA rIyaA)-Ije -SOB Subject S T62 M w ATEr. i' of r . i I ; IAIQIE'. • I j t i i Cl =i o is 3 b, o a �o __ __ I j • Ib�v-i T� c 7 / S. I �. = i i 1 ��illill �.¢�� I�I1 • 1 1I i t d.•7 �2'4-IX z� _— •_ 'ZG.IFs,I o y� _.' 0,7 —Y 4k. x /•L I3 9s� i i pEti. I �Qiioe ;ip . I= I �, z � xl 0,.�7,,� x �. z xl i, z- - - .so _4.r. I i I/�tITGW.EILi i pJ1IVIC— j 2..I ' 1 iil I i I � I f C;2W( jA,P-E •.I � �° o1Z i • iIL _� _. z 2 a l ! I ! i I mow; It I li �� I I I I I i� j OpGb Z ti I ! • I I I I IffS'i�i� _..• �I I! 1 I 7 rf : I ��I .2 Xi. 7 g i I 1 i bjE� • 1 Q Igo �,z d� c.� , �4•,� i s ems. Tc.-'S�, 1. ! �• i!Ij IY,. ZSX o Rio , , Till y 17, 49 I ! 1? "3 /I !; cFs• I i STRACHAN CONTINENTAL SUBDIVISION STORM DRAINAGE REPORT July 3, 1981 Prepared by JAMES H. STEWART & ASSOCIATES, INC. Fort Collins, Colorado James H. Stewart and Associates, Inc. Consulting Engineers and Surveyors 214 North Howes Street P.O. Box 429 Fort Co!!ins, Colorado 80522 (303) 482-9331 July 3, 1981 Mr. Robert Smith Storm Drainage Division City of Fort Collins Post Office Box 580 Fort Collins, CO 80522 Dear Bob: Laboratory: 301 Lincoln Court P.O. Box 429 Fort Collins, Colorado 80522 (303)484-6309 The following is the storm drainage report for Strachan Continental_ Subdivision. The report denotes the storm water runoff quantities for onsite and offsite areas. Construction plans for storm drainage facilities are included in the Utility Plan for the subdivision. If you have any questions regarding this.report or the storm drain plans, please call. Sincerely, JAMES H. STEWART AND ASSOCIATES, INC. Richard A. Rutherford, P.E. & L.S. Secretary -Treasurer RAR/vr INDEX Narrative of Report Storm Drainage Calculations Area Site Map Drainage Area Map Swale Calculations Page No. 1 2& 3 4 S 6 STORM DRAINAGE REPORT Strachan Continental Subdiv Strachan Continental Subdivision, Fort Collins, Colorado, consists of three lots zoned Highway Business and encompasses 9.59 acres. The subdivision is a part of the Foothills Drainage Basin and lies Northeast- erly of and below the Larimer County No. 2 Canal. Approximately 11.3 acres of the Foothills Drainage Basin lie above this sudivision and run- off not intercepted by the Larimer County No. 2 Canal could be expected to flow through the subdivision. The historic flows are from the South- west to the Northeast corner of the subdivision and proceed to:.&:thabweg 400 feet North of Hosetooth Road and on Southeasterly to Warren Lake. Developed conditions could see historic two year quantities being piped under the Larimer County No. 2 Canal from the 11.3 acres from one or more detention basins. This quantity should not exceed two cubic feet per second at the two year historic rate of outflow. These flow's could be delivered to the surface of this subdivision by proposed siphons under the canal. Storm water detention for this subdivision has been negotiated for with the Warren Lake Company. Therefore, no on site detention will be provided. An underground storm drain system has been designed to carry the ten year storm runoff Northeasterly across Horsetooth Road to the Strachan Subdivision, Third Filing storm drain system. This storm drain on the "Are-na" property has been built and the surface leas been graded. The "Arena" System was designed to include runoff from the entire Foothills Basin. It will carry the Strachan Continental Subdivision runoff to Warren Lake. -1- .i. I I; _ -.COMPUTATIONS -James H. Stewart & Assoc. 1 Fort Collins, Colorado I By:. _ r2 !4 L _;._._: Date _.7/3 I> R ► Client:-_' ��. r � Tr N EGL F l Sheet No. Z of Chkd By: Date Project: r "I(- u,A. it inn 1�1-7-,., _ . e- c• :Job No. Subject S TO . A,1 D P� A / ri! ( G A L.GULA r/n,r/ c-, ; ._----........ _._........... -'— - __....._A........--- . : : A Q.E Q....._L_ D6v, 7J�) (.T•/ l/•8) ( `Si J. ��7CFS; : \ 1 - / 25 �s C. C/• iz, a. IFS I i : I _ .R.A/A� ___Azr—A..._!._._: _. /A........Z•_..S..Ac:. i ---..C:=_0..95� ..TL : 1 _ 10 D6V: \ ../.X'(.°/S) �4rS) (z.sJ � L0,7.G�S. i p /V ......'.. A i /.9 Ac. , C=o,75� Tc.=/0.-,/,v ' T= g,ss Q ro 9,5) (¢.,s:)C FS. _ 9 )Div. I : i A2,EA FT! =.1-.4-,Ac., _C=0r9,S 7c, i l0/41i.v 1. ¢,S c, - V.r, b cv.=./,z:S�Ci j a _ �s��7•I) (l.4). - f 9.9 c•�s.' 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