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Home My WebLink AboutSILVER OAKS COMMERCIAL PUD - PRELIMINARY - 14-88J - SUBMITTAL DOCUMENTS - ROUND 1 - DRAINAGE REPORT0 • PRELIMINARY STORM DRAINAGE REPORT FOR SILVER OAKS COMMERCIAL P.U.D. PREPARED FOR SOUTH TAFT HILL INVESTMENTS LTD. JANUARY 3, 1994 STEWART & ASSOCIATES, INC. 103 SOUTH MELDRUM STREET FORT COLLINS, COLORADO 80521 303/482-9331 • • STEWART$,A.LSSOCIATES Consulting Engineers and Surveyors January 3, 1994 Mr. Glen Schlueter Storm Water Utility City of Fort Collins P.O. Box 580 Fort Collins, Colorado 80522 Dear Glen: The following is the preliminary storm drainage report for Silver Oaks Commercial P.U.D. situate in the Southeast a of Section 28, Township 7 North, Range 69 West of the 6th P.M., Fort Collins, Colorado. The site is located in the Spring Creek Drainage Basin and contains 5.03 acres net. The site is bounded by South Taft Hill Road on the east, by West Horsetooth Road on the south, by a future filing of Silver Oaks P.U.D. on the west, and by Bronson Street on the north. The site slopes from southwest to northeast at a grade of approximately 1.0%. The site has a good ground cover of grass and weeds. The proposed planned unit development includes a convenience store, including gasoline sales and a car wash. The other proposed uses are a day care center and five office/retail buildings. The net site was used for the preliminary drainage calculations except for a part of the future phase of Silver Oaks P.U.D. which includes townhouses and is located along this site's west boundary. Taft Hill Road and Horsetooth Road adjacent to this site were improved in a capital project done by the City of Fort Collins. The storm water runoff from the two streets enters existing inlets at the corner of Taft Hill Road and Bronson Street and at the corner of Taft Hill Road and Horsetooth Road. Both inlets discharge into the Rossborough Channel on the east side of Taft Hill Road. The runoff from Taft Hill Road and Horsetooth Road is detained in the existing detention pond in Rossborough Park. The runoff from Bronson Street enters an existing inlet and is detained in the existing Silver Oaks P.U.D. detention pond. The runoff from the proposed Silver Trails Drive will also be detained in the Silver Oaks P.U.D. detention pond. 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 0 0 Silver Oaks Commercial P.U.D. Page 2 The rational method was used to calculate the runoff from the site. It is proposed to detain the difference between the two—year historic runoff and the 100—year developed runoff. The historic two—year runoff rate is 1.57 cubic feet per second. The 100—year developed rate is 26.14 cubic feet per second. The required detention volume is 31,668 cubic feet. The detention pond will discharge into the west side of the existing inlet on Taft Hill Road just south of Bronson Street. The runoff will then be carried across Taft Hill Road to the Rossborough Channel. The site has five sub —basins, and a drainage table for the sub —basins is shown on the preliminary grading and drainage plan. Erosion will be controlled on the site to preclude sediment caused by rainfall or wind leaving the site. Straw bales will be provided at the discharge pipe from the detention pond. The detention pond will be constructed to function as a sediment trap. Also, silt fencing and temporary vegetative re —seeding will be used as required. The preliminary grading and drainage plan, the storm water calculations, and the mass diagram are included as a part of this report. If you have any questions regarding this site, please call. Sincerely, Richard A. Rutherford, P.E. & L.S. President jrr enclosures STEWART StCIATEC 103 S. MELDRlJ1 , FORT COLLINS, CO 80521 PH. 482-9331 FAX 482-9382 Consulting Engineers and Surveyors By: K A, Date: 17-3/ Client: So ter. Ta r Y/L r_ T vv. Sheet No. .3— of Project: S i I _ v r-- iz, n,a c r- o /Lt /t i E 2 c L= P Lu,D. Subject: C-fn A2 AI l:L'ATr2 2U,nJoCc' CALroc_vc H 1s -re F' r /V E-r A R E ,,A = S', 03 A c ,e e5s 4S0 4- /.50 Fr /.04%3 = 33 M,,U . �- s = 3S mr.u. Qzyp_ = O, ZS )C ZS X ,S, 03 = / S7 c.Fs. Q1 /07,e = 0.7-S x 03 = Z'80 G.F.S. 100 yz. TC- 87 1l.1 — (1,25xO.as) 4-50;1?1 3/M.u, A5�"A� 0 4. f3 �ICT�16c. Q Io0 y� _ / 2SX D-25 x C..F,1, STEWART SS*CIATE 103 S. MELDRU , ORT COLLINS, CO 80521 J PH. 482-9331 FAX 482-9382 Consulting Engineers and Surveyors By: 2 A, P-, , Date: z 31 Client: -io u rm TA7- 1yjLL ru yEjT, Sheet No. -4-- of Project: C I L- V S P— (2 A K s C„ �, ,� � �_/�A L _ P r>. -p . Subject: ST n 2. m W RTF- ,E �1)A)oFG (,ALC.(lL_A T`/n.or DEVcLOncID /VG-7- ARG—A _ S, 03 Ac. Z M p--F—vfo vs A R 6-/q = Z -(0Z- = .52, 1 nIo PEP-V10Ur I rZ E FLL .Q y G- oV N D Ap. r- p 0.17 A -- = 3-9-a/,) C = C x O•S11) -t- (0•Z0 X 0,9-4r) + (O-SOX 0•034-) = 0,&3 T, 1, $ 7 (, I- D. G 3 17 0 /1- G G 0_F_I i. (, -f- Z F-r�,JE4 , Qzyp- = 0,('3 x.Z'I x s,o3 = t'i•(,S C..F .r. Q pe = 0. 63 x 3, 7,5 X S 03 = /b J39 C,f,r. 7-L - i87[/.1 — (I zsxo.63) Izo�L +- -i 3PYAj 5.Sxf,u /.O Z'r7bcc — 1Z AIti Qlaoye- = 1,Z5x0.63x lc•(, X5,03 = ZG•/¢ �,r�J STEWART S,*CIATEC 103 S. MELDRUIR'FORT COLLINS, CO 80521 J PH. 482-9331 FAX 482-9382 Consulting Engineers and Surveyors By: R A r2, Date: !z 3 Client: S'ovr� TA Fr HILL SNvera r,$)j Sheet No. s of Project: s f L. v f=- P- 0 /A k1 _ n vti &I -- r2. ),n L� Subject: J i`0 e M V) A 7-r: p- 2u AI o Fr- ( A L r- u L A T-/ o N S Jv b — B xq.r/N "A" A P'-ER = 0. & 3 Au C = a. (,3 - c- = L 87 (1. 1 - 0, & 3) 35-0 + �13 DGv, gzy,,- = 0. (,3 x z,)x O� 63 = 0. 8 3 cr-S Dsv. o �R. = 0. 63 x x 0-6 3 = 1. 4-9 c.r.r. TL�=10jqt,N. D6v. C�,00y,c _ /-2ZX.0,&3 x7-Z x 0j(,3 - 3.5-7 c.fr Sup,- B,y'i,o "B,. A(Lc-\ = 3.2.& A,-, C r 0 .& 3 0,G3�X 150'/1, + OFJ Z i5.S /r;'J Dev. QZN/e = 0•G 3,x Z,l8 X C.F•J. D•Cv. (�lo.� 0,�3 x 3.5 X 3 Zrc 7.P0 c.F�. Tc = 11 w"J, DEL', C000 w . = I.ZSx 0.63x 6,9 X 3-Z6 = 17.71 G, F.J , STEWART SACIATEC 1111 , 103 S. MELDRORT COLLINS, CO 80521 PH. 482-9331 FAX 482-9382 Consulting Engineers and Surveyors By: IP . A. 2, Date: /Z Z 3 Client:, flu T TA F r / 1 /cc. ,L&vri7 Sheet No. (4, of Project: i L V er- A I-s e M M 6 ,p G/ A Subject: .i Tn p- m W A T F- ,e /2 u !i) O'r F C A L G V L 4 7 i ey-r Sv a - t3 AS /,d °C '' A P.s a - 0. 3z Ac, C = 0,9O Tc = IE,7(/,I- 0•17o)50'4 4- l76 Z,� /l1A),.v. 3 Z FTj�1E c- 41 / U. Dev. C) zye = 0, 90 x 3 .4- x O- 3Z = O. )8 D ES. q 10 p- 0. 90 X s C. DEv. Ck ,00 ye" z5, X 0, 90 x 7. z x 0, 3 z- = �•3 � c, c s. SU a - 3 ,q SVAJ .�.. A 2 C ,4 = -0. a z A, . C = © . 4-S- TL O. 45) 4 440 �' _ Z 3 Al I .v , v • CZ -z y, = a • 4s x 1. 7 X 0, 3 Z - 0. G ,3 L • F.1', DEv QtoY/ 0,4sx 3,o x o, 8z = /'// c./�J• Tr- -- r1At/.v, DEv• Q tool2 = /, IS x D, 4--5rA S �3 X 0, 8?- - Z 4- , GOFJ, TEWART SS�CIATE S 8� S Consulting Engineers and Surveyors 103 S. MELDRUI , FORT COLLINS, CO 80521 PH. 482-9331 FAX 482-9382 By: 12 A- P-, Date: z CIient:.Tm1-r & TA Ft ,,Le-Z.N1/CJ7; Sheet No. '7 of Project: _ t _ v -- P A r -r �' n M c,i n r . A U, D. Subject: J-'TO r- 14 V) AjEe, iJ it oFA C At- ct -ATio,uJ 13 AJ / ,U „0 F F f / -ram A,2E A 0.77 roc, C = 0.4-5 Tc = 1, 67 I• / — 0, 4 S, /50 12- _ �S AEA, Qzye 0.4.S x Z•1 x 0,?7 = 0. 73 c., F,S AGE /ayp- z 0,4ZSx S-7 X 0-77 = 1'Z8 c,FI, T` : IZIA)A.) pEu, Q /ooy,t.. �- hzS x X 0,77 4�, STEWARTQ ,� SS*GATE V� ` S Consulting Engineers and Surveyors 103 S. MELDRIA,FORT COLLINS, CO 80521 PH. 482-9331 FAX 482-9382 By: R /i ,2. Date: !Z 3 Client: Jou -rA TAF-r Sheet No. 5 of Project: _� i, v F D.a �c �', n m Am - n_ _i A _ Subject: N1 A,cs L> i A P- A r -t-iM c MIN . _-T, Cs C q Q �,gs_ ocuMtgj=N VoLVAIEOvA -P TEA4, /0 71Z i.zsxo.43ks,03 Z8.5 1 /7,10 (o 94-z i/,/iu4. Zo S?- = 3 9(0 2os9 Z4,70E3 /884- Z7,f?4- 30 ¢,2 /G l03 27J 93¢ WZL Z71108 40 3•S` /3-06 33,ZG4- 371-$ 29,4-'11,. s0 3-0 /l168 7/0 30,93C Ga Z,G /0.3 0 37,1000 56,5Z 3 ;4-38 70 Z.3 9- 11 39, &5'70- 31,e/,R-- $0 1z' 38, `77-le 753 & 31: a-10 90 1.8c 7.37 35, 798 8 9-7e 3l, 320 IZo 143 S1(I6 4D,7.S2- 11)304- 44g 180 /.os f Ilo ¢¢, 9Z5 Soo 0 0 �401600 it � J _ v a m 0 � V U3 �1 v zo,000 ti A�AT6 i C, CCC I o 10 20 30 40 SO Go -70 60 90 CI de sdale y 1 desdole Gr¢' �o�qr �� Ct. CD ono 'D `o �`v...^aso• Pipestone �. __ w O Gt • / >a 3 Dr. cam' ('ord¢° 4 Charob�s �� s�nm Dr. Ct. Sca borough r, r s .' pc. JyG4��o C. ail _Y Forge Av Gerrrantowry `hvo��° Concords.~// 0 W J .. Ave. 3 v D r Q G O� q Va(leo< ° "�. t:. r �mpshire 5rr Ct. 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