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Home My WebLink AboutDrainage Reports - 04/29/1994STEWART&ASSOCIATES Consulting Engineers and Surveyors-. ERTY OF WOKIr CALLANS UTUJTM April 12, 1994 i Mr. .Glen Schlueter Storm Water Utility City of Fort Collins P.O. Box 580 Fort Collins, Colorado 80522 Dear Glen: Re: Proposed Parking Lot at 345 East Parker Street for Columbine Care Center East This site consists of 7395 square feet, which was originally a residential 'lot located on the south side of Parker Street immediately west of the Columbine Care Center. The site is located in the Spring Creek Basin, and all runoff from the site flows overland in a southeasterly direction to Spring Creek. The existing residence, outbuilding, and gravel driveway have been removed in preparation for the construction of a paved parking lot and landscaping. The existing site had a runoff coefficient of 0.4537, and the proposed site will have a runoff coefficient of 0.5337. The existing 2—year runoff was 0.19 c.f.s., which is being used as the release rate. The required detention volume is 505 cubic feet, and the capacity of the proposed pond is 783 cubic feet. There is an existing storm drain manhole located in Parker Street in front of the site. We propose to drain the detention pond into this storm drain manhole by using a.15—inch PVC outfall pipe. The line will be the maintenance responsibility of the property owner and not of City crews. This site is in a.moderate wind and rainfall erodibility zone. Rainfall erosion will be controlled by installing the paved .parking lot immediately after grading. The unpaved areas will be landscaped and planted soon after the curb and pavement construction is completed. A gravel filter sediment shall be installed over the detention pond outlet. Wind erosion will be controlled by the installation of the curbs and pavement and by the existing trees and buildings adjoining the site. James H. Stewart and Associates, Inc. 103 S. Meldrum Street P.O. Box 429 Ft. Collins, CO 80522 303/482-9331 Fax 303/482-9382 Columbine Care Center East April 12, 1994 _ Page 2 A utility plan sheet is included with this drainage report. This sheet shows the proposed parking lot and storm drainage facilities. Also included are calculation sheets for detention volumes and, release facilities. The calculation and design of this facility complies with the City of / Fort Collins Storm Drainage Design Criteria. Sincerely, a aq � �sr . �d• F Phillip I. Robinson, P.E. & L.S. o Vice President.�g • jrrf • enclosures °'••,;;�Of��C01�d�;•`' L > SALPMI 0 INOIy ME ,.�•.� , . WEST a s " IwDI\w f1'rvv /) PA �' gpRl/vc PARK OA. 57• VRA/N s J RE- a SYS l 4'• LU At r TRACT/ = rIra ': yyiG yl 0.tMy � 1 fN•`� i P• ct 2 j •11 Lf 1 P col.urt0 v • O ` - i N 1e r U I { • : ° r, eenTO" .� SCNOOL I I u '3 CIO W. 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J. s 1 t r � I- arsvr�zccG=1 IOU O.9f! ----- ( -� _,—s�¢.�—'- 5,!��e►1 odri'v�_ I c-) o._SA P 10 3�_ _0s hill d, _.Exfs_i�inS_�hls�or►c�_ .Z . >J r;�no� _ . I _ __ . I ( � I I � I__ 3 i M,„ �i - —�- Q '- GI .� =1- (G. i S �)i Z q�CO• +7� =_ Oi.l 1,7 ITS - 1ZF_LSE? SATE �fl ! I i _ O'N_D__._t ECFAS_ _ F_$.'C(ZIC-71a _PLATE.._. -- ---- ! -. GloriC.�b.e_P� I j , e?. wf; �ror�o�a I - _.. ! 1 J rd- .105 S. UM STE V VART&NSSOCIATES PH. 482-93311RFAX, FORT 482-9380LLINS, CO 80521 Consulting Engineers and Surveyors By: P I TZ Date: z f- Client: Sheet No. z of Project: Subject: o. 4- _.U.21 - - --10 — -- - legse_ottYi�Fs. _ IIDeje.,�io.h s 42 I 50 Atz t ---_21.I2_.i_—_J.- 1 I I h-�-1 o h i - I _ I t i i I 40...1 STEWAR &ASSOCIATES 103 S. ME 3DiRFAXFORT gOLLINS, CO80521 Consulting Engineers and Surveyors By: p%%Z Date: Z // Client: (fa&,mhine )Ve4k Sheet No. 3 of Project: �IVI"bioP Care Eek.4 ( JK Porker) Subject: llf-�A/ Sa rk i n c L al-- -Lio', _Dr _ AJTton�__ fJSI F__�� EI�T jL�. _l•IU � �T' I--� �3 OP l I I , I 3 ' ---------=---------- RAINFALL PERFORMANCE STANDARD EVALUATION* PROJECT:• -------------------------------=--------- Golvmbine Care Ep-rf �45 Parke.- _ _ STANDARD FORM A COMPLETED ------------------------ BY: DATE: t q q DEVELOEO ERODIBILI-T-Y ---L--sb-) -----S-s-b------ L-b----- _ Sb PSP ZONE ac) ft ,-- (feet) (q 0SUBBAS--- ------ ModervL 'e -(Asb ---- Q, 17 -(----- 100 --- % 1p ------- --T---_-_-__fI-_-_ -- -_) -_- I a i ID I /SF -A: M EFFECTIVENESS CALCULATIONS --------------------------------------------------------------- PROJECT: Cow.#• Whe 14eafih 39-5- Pa rke'. STANDARD FORM B COMPLETED BY: DATE: 2 9 Erosion Control C-Factor P-Factor Method Value Value Comment -----------------------u --------- I- o I- a • Pvr�� 4 ConC, 1-o! weed 4 ,.,�Id o.oc I:o! MAJOR BASIN ?rrA� i--PS-- M 7¢ G SUB BASIN I I AREA (Ac) 0,)7 --------------------------------------------- CALCULATIONS ------------------------------------------- p%I,AA - cons = 0. o75 ,4c -s ecd y ,/u vl co , o9 t A4- ,bA('c SOl( _ G = O.04- ELF= I — �0 r/¢x•5� x100� 787� E ------------------------------------------ -----------------------------� 0I/SF-B:1989 CONSTRUCTION -SEQUENCE PROJECT: STANDARD FORM C SEQUENCE. FOR 19 ONLY COMPLETED 8Y: DATE: /2 Indicate by use'of a bar line or symbols when erosion control measures will be installed. Major modifications to an -approved schedule may require submitting a new schedule for approval by the City Engineer. YEAR Q4 MONTH M ---------------------------- ---- OVERLOT GRADING WIND EROSION CONTROL Soil Roughing Perimeter Barrier Additional. Barriers Vegetative Methods Soil Sealant Other p vmP4- conc RAINFALL EROSION CONTROL STRUCTURAL: - - Sediment Trap/Basin Inlet Filters Straw Barriers Silt Fence Barriers Sand Bags Bare Soil Preparation Contour Furrows Terracing Asphalt/Concrete Paving Other VEGETATIVE: Permanent Seed Planting Mulching/Sealant Temporary Seed Planting Sod Installation Nettings/Mats/Blankets Other STRUCTURES: INSTALLED BY ' MAINTAINED BY VEGETATION/MULCHING CONTRACTOR DATE SUBMITTED APPROVED BY CITY OF FORT COLLINS ON HDI/SF-C:1989 JaNik?Y 1991 - 8-20- DESIGN CRITE'I STEWART&kSSOCIATES 10 S. E DRUM, FO 9 8° Consulting Engineers and Surveyors By: PJK Date: IZ Client: Co lUM bi n e Project: _ Fa r-k i n.s L o L off- 3491 Pct r-IC e rr S� , Subject: F— r o s I o k% CG S �I �t to e11 lio n ;III ��I ill 1 -III VS, GO 80521 Sheet No. of JOIN 15'RCPIMO EXISTING MANHOLE RGAw PoN EXIST SEW[R NERJICLN (F U O AT MAIN VY LpINWTON SIC OENT AST REQUIRED OUT CITY ExIST T/S'WpT¢R R W:ro TS Dr NSTL¢TWMETu {LeT.so eT. _ t9 QQ� F XJ TON 11 SIG- >a- . :FI 1 DETENTION POND FL 05.15 W p v � ' L Y aq" WQQ� O �J m ''`STy31 n y OS.RO f-" ______�uuR ICRA+RLL �. �Pe. 4?ifJ£D it L 49Q1' _ 8X 6 L9 N SCALE- /'=/O' 3F_NCH MaRK = 41 NE50 FN NW Cars. PARKER f WNED6EE . Q WIN I� EUOrM 99 O x tr5-1� Oj Hs' So To > Gb Iiµl, Is• uHe n/ H/ PARKER 5773EE_T CNOTE I CONTRACTOR SHALL LOCATE ALL EXISTING UTILITY LINES CROSSED HV 7415 )S"RCS' �SOTX 00RIZONTMLY AND VERTICALLY`) PRIOR TO B£GINNRIG INSTALLATION OF TH£ l_RCP. £AISTINb POWER.% LILT w\II .40 �u F JITJrvG CONC. WALK JSNRCP N PIN Ef AM R 1OWNER OI NIR P i IF Sov Ex-3T �o-rc. Wru. A ARE%' Ex15-rlry6_PprPvEINE'_ _ 7a Sin„J ii e NOTE 5 / ISS.A�T MAIN sERVI CE LINE TO BE 9DAMSTIDONEON Z. EXISTING WATER SERVICE OTTE TO 8E (VSEO FOR ' STALL A /RR/6AT/ON. y;A0 METER) /11ER05I01`4 CONTROL: �0N `OICTOR TO CLE.AWN OFF ALL M17 A.vD DETIRIS TRAfXFO ONIy PgVEMENT. 2. INSTALL A SEDIMEIJT TTZAp FUT DRAIFr Rl0£ IMET i AN IN IM ITT IN, UUT UUT ULP m AN _ A TV NY YNNINY NI AIANNNN. UMI TOP IN"m IsT �LIT IN THICOLUR TV — 1 TZ AIU3Y SURREY JOWT )uINLIE (WNLAND ALI CURB AND GUTTER DETAILS LEGEND --1°�-- EXISTING OVNTOLR i�87� FINISH CoNTUVR (66.06), EXISTING SPOT ELEV. IT 8600 FN/sN SPOT ELG V. �r 61CVRG/2+°INFALL OUTTER 6" CVRG/ I Z" OVTEALL GLITTER SHADED AREA STORT WATER DETENTIONt "'AAAAAAAAARTARRA STORM WATER DRAINAGE BASIN 60UNDARY _ DRgINAGE SUMMfi R'(: � �� 1. AREA OF 31TE = 737S 5.F. r 2. SITE IS IN SPRING CREEK FIFs51N/ 3. HISTORIC C- 0. I531 6. PROPOSED C- 0.5337 / S. RELEASE RATE Z 0.17 6. DETENnON REt3UraEDE 505 C.FI T. DETENTION PROVIDED_ 783 G.F. S MAX. PoND DEPTH_ 1,3 FT. j. RESTRICTED OVfLET OPENINPe C.7"DIA. P o�E LED O� CONCRETE HE..nOWM.L ri O 004 5 OU 3'. 81A I DELP VC[[- IJPLION L/IrW of e coNc PAIN ArI pJ71F_T PIPE SCALE jf'fzz Z w`Nw=rc YILV r u imnr.nr. .m ... ..... ........ ...._._._._I_L ...... . °sam oil LAW mazImm, Syr. Ise PPVE> eE y0E IIRLN�Lei AP Ir �. 2 WIP21C ,x 4° Osn IN IVAN IIn:111111aem"m ON it a r u� �E 00 �IIGdEd <onrc HEADw.o LL To 8E V / J LAST ON TOP U[ PfrN AND ANCHORED WITH � JI p J r- + Y DOWELS ` Ix. PZ r5' RCP OUTLET PIPE N •/ Ve" THICK STEEL PLATE C m I 1 I ODLi[D TO SANG WITH T 2 n %." A4 8OLT5 i 0 PA/NTEO WITH ZINC KI CHROMATE THEN VrTH IL1 ALVMINVM PAINT J 2.7 CIA RE517I 01,151 p IT [ /Iz SECTION AI L .L •I.rrin•.L NAI OY.1 IN I UN IN IN Mk. mANN rAUUMA NM IN s••yNTAN W U A L E ANUNN ANANY YI _ :y ��rr'" N 4' TUMN AI NA, IL YN :c_IN rrIN 'r...�TNUT a I"'.. .... _.... _.. r ��rQL � C �,. %,LY �.. _,....ru.. r. 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