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HomeMy WebLinkAboutDrainage Reports - 10/08/20011 1 1 t 1 FINAL DRAINAGE REPORT LINCOLN JR. HIGH SCHOOL CLASSROOM/FACILITY ADDITION WEST VINE DRAINAGE BASIN PREPARED FOR POUDRE SCHOOL DISTRICT OCTOBER 8, 2001 PREPARED BY STEWART & ASSOCIATES, INC. 103 SOUTH MELDRUM STREET P.O. BOX 429 FORT COLLINS, CO 80522 TEL. 970-482-9331 FAX. 970-482-9382 Table of Contents 1 Vicinity Map 2-3 Teat of Report 4-8 Stormwater Runoff Calculations 9-10 Detention Calculations 11-13 Erosion Control Calculations Pocket Grading, Drainage and Erosion Control Plan L nd, DI.- POL iatc o —07o La liberty Dr. terhaq La. a umef -jjjw'Gr St. a El I , ]Roe- W. vat W.zl -------------- W. Vitt Dr. OL E It L If SS a ......... Z 26 J ww MN. ad 12 J. to and," RL ar culf St. A I Ok POL L LMN -77 st. We% 1: M. It UF W to dvim'. or Ir csu AN r I 7 CC i Anach Dar La ez or c- at -limanc Dr sc CSO 1krobtrif 1hL 21 tweak fluer 99 1 --------- Ina pg. -=ILWiDL 4.4 Dr. qt- r Andh 31, It m T Irm 7 !VW. I IL III n1. Clio W Itapect td. kw Na .4 ut 77 3 S. L fie NC L ai DOM" I 4 all Aw w Sat =G "d 0 W, C1 w - r. Sat& CIT. - Rk $TEWART$ ssoCIATE$ ' Consulting Engineers and Surveyors .1 October 8, 2001 ' Mr. Basil Hamdan Stormwater Utilities City of Fort Collins ' P.O. Box 580 Fort Collins, CO 80522-0580 ' Dear Basil, ' The following is the final drainage report for the Lincoln Jr. High School Classroom / Facility Addition. The site is a 0.96 acre area on the Lincoln Jr. High School campus. 'It is bounded on the ' South by Lancer Drive, on the West by an existing driveway on the East side of the tennis courts, on the North by an existing driveway on the South side of the school and on the East by an existing parking lot. The site is in the West Vine Drainage Basin. ' The site slopes from West to East at approximately 1.7%. The ground cover is native grasses and weeds. ' The historic basin has a two year runoff rate of 0.29 c.f.s. and a 100 year runoff rate of 1.28 c.f.s.. The runoff flows East to the West curb of the existing parking lot and then South to the North curb and gutter of Lancer Drive. The runoff then flows East in Lancer Drive. The developed site will have a new building constructed and a new driveway and parking area constructed on the East side of the proposed building. The runoff from the roof of the building will drain to down spouts on the East side of the building and then to the West curb and gutter of the new driveway. A concrete pan will be constructed on the West side of the building to carry runoff from the ' area between the existing curb and the building South to the North curb and gutter of Lancer Drive. The new driveway, on the East side of the building, will have a high point at the approximate midpoint of the length of the driveway. Therefore there are two sub -basins for the developed site. Basin I has an area of 0.52 acres and its runoff will flow North in the West gutter of the new driveway to the South gutter of the driveway on the South side of the school. That runoff flows Southeasterly to a slot in the curb ' at the Southeasterly end of the small existing parking area. The runoff flows into the existing grass open space which is a small stormwater detention area. It has a 4 inch diameter P.V.C. outlet pipe. The outlet pipe previously discharged into the gutter of Lancer Drive. Apparently the sidewalk and curb ' deteriorated and it was replaced without the pipe through the sidewalk. We have required the pipe to be replaced. The two year runoff rate from Basin I is 0.90 c.fs. and the 100 year runoff rate is 5.04 c.f.s. James H. Stewart and Associates, Inc. ' 103 S. Meldrum Street • P.O. Box 429 • Ft. Collins, CO 80522 970/482-9331 • Fax 970/482-9382 ' Basin 11 has an area of 0.44 acres and its runoff will flow South from the high point in the West gutter of the new driveway to the North gutter of Lancer Drive. The,runoff then flows East in the ' Lancer Drive North gutter and South in the East gutter of Lancer Drive to the Vine Drive borrow ditch. The two year runoff rate from Basin II is 0.57 c.f.s. and the 100 year runoff rate is 3.04 c.f.s.. It is not possible to detain the Basin H runoff in the grass open space due to the existing elevations of Lancer .Drive. The volume of the existing small detention pond in the Southeast corner of the green area is 3,649 cubic feet. The volume required for the entire new classroom/facility addition is 9,504 cubic feet. ' We are requesting a variance to decrease the required detention volume from 9,504 cubic feet to 3,649 cubic feet. The detention pond high water line is limited to elevation 5032.25 as shown at the slot in the curb and the East end of the proposed pan in the detention pond. ' EROSION CONTROL: ' A silt fence will be constructed along the North and East boundary lines of the project site. A straw bale dike will be placed at the South end of the proposed swale on the West side of the building until the concrete pan is poured. The foundation of the building will be constructed as soon as the pad ' is graded. The foundation area is 0.45 acres which will prevent erosion. If you have any questions regarding this report, please call. ' Sincerely, a - Richard A. Rutherford, P.E. & L. . RAR/meh r 1 STEWART&ASSOCIATES 103 S. M 3DRUM,FAX FORT gOLLINS, CO 80521 Consulting Engineers and Surveyors 1 By: Date: Nov. 14, zobo Client: _po u r->,c E Jr uoni_ Dis r. Sheet No. ¢ of ' Project:_[ i-ni ,u 71-2 !416 N S-,-- Hoof CL.A sreonAi �FAGic_iT ,G` i>D17-16Az Subject: -T/J,-nn (.clATF2 euAaFc ,4«uc-aTiaAH/crnz« 11 1 1 i l_1 _FJ IS TbT _ I !Ag-e;Ait it l•._S_7>(_!.-1�_D•Zo)—i1-7� �i E - l.4-o_,L,F_ T/8_A ivi ts_n.iu I i I 11 T J I zy_jZt= K._ 0.19 / I ' I 0_._2 y'_ c F 't._' - I - Y4 q__J__0-Z_0 X_i2, SS_X O it 9.6 - f! D, 4LJ _�I F. S.• i i TL uT Q�a�_ye 9 r.'.Z(s x_D =+hz_5�._Fr+ zz;u,ti. ,zo!xI $,_3z'k10'9..G � I ' i i i i� i i i i• i : f _ H1 i _J!----�- i I 1 1 1 1 U 1 1 1 .1 1 1 i 1 i i 1 1 STEWART&O SSOCIATES Consulting Engineers and Surveyors 103 S. MELDRUM, FORT COLLINS, CO 80521 PH. 482-9331 FAX 482-9382 By: R, A -R. Date: Al av- 1� jai Client: pone j= -f-r. H ooe- Der r. Sheet No. 5 of .. - ... d Subject: S• .. C o : : FaP-M-1 0-01. 1pFs V l 0 _!_�__�--�_f�_i G �(D-•_9Sx.l._D _�D_)_+- (-D ZO xi_0�3_b�_i= O_�fst D ;06D� - - -- F — �I 7.uiu. �- ISM/1t I -it 4 i T� _' _l•.S_?(;! I —} 1 I 0 7-3)_�s 1r_ �3 j-.T biz f 31oT i L:�Z. i -73z� 9 I! I I Q_/o.'y2� I.O.,-�3_XL3. �3 x O_9✓o — Z S4-�tc'FrT! 1001e.= J_z SIX I c_Fs; I I - .-}--�------ ;4J- ;� I i i I i _��- 4� i--mot- I i , ; H, r I 1 11 1 [1 1 I STEWART&ASSOCIATES Consulting Engineers and Surveyors 103 S. MELDRUM, FORT COLLINS, CO 80521 PH. 482-9331 FAX 482-9382 i.<� i • . Subject:• •. i i 1 I , ! r _ � L—.�_' —,- � t� _.I;M P_E2-V !o u1—,�} � E.4 I _O_, 9-0 %GT! —,% �o •.9 °!o I _i._ -i— ER_T.(� i - �Gl - f�6 __9S_x I0.,7G_y_� D f ; g 7 too —...- i i L I� I ! i Igo �R = 0,47 Slx�3 78- X i-�i- i y I it TI S-�.v I lQ�o.u_y - .l zS X_0 8_X 9-9s x O�Sz S Q4_G1J, { I I L I Ili-�� �, I I I I I I I I I I I I I I I I STEWART&ASSOCIATES 103 S. 482-93MELDRUMFAX , FORT COLLINS, CO 80521 PH. 31 482-9382 Consulting Engineers and Surveyors By: RAP Date: y0ov, 14 Z,000 Client: Po up e- g: -Te- A+yo� "D ts re/cTSheet No. 2 of Project: AJt-,,) L -k I Tp,, P16H S,-A4onL Cz-As-sq-oom 1FAe-,Lrr.X A o p , rlov Subject: u W A rr-ALU1-4T-1t,), A, ,) - r- C As-LIU Z. A—i e2e�4-�F—!b. T­ 4— AZ-c 0- 38 6) O-Zl 8. +Lo.1 OB it I t L J 7.Z P Zr 0�&/' x T C, FS. t 10 Ip 6-6 6 x +3. 3 j 1c 6 4-4- = D_, `J 8 G. m -0. L 7 [1 .1 1 1 [. I 1 1 I L� STEWART& SSOCIATES Consulting Engineers and Surveyors 103 S. MELDRUM, FORT COLLINS, CO 80521 PH. 482-9331 FAX 482-9382 By: %ae- DateTSAN z1,Soo1 Client: Poi)pe.E,%A4oSok- Di-r Sheet No. 2of_ Project: l /AlGol ,t1 Jc)'U1or2 H/GH Fr-H0o A-S-SCnpAl /) ,4c14- zx A4001r1o,) Subject: Ra m a c< l A LC u L A r/n N t 1�:n e T) 2.4 1 A) A �w ac.F e Al j�4L r 7- fines f_D2A1�%11%G'l4=AG't _OS_ l 4 3- I I I 1 I - t- &i43 i �g-p Z i --1 Di_F:r -- i Z D f .t ! 1 T -� % �3 j-'— r 1 __1_ z M i•V f"' ZI A •`r�lL %.!/. I 7 �• I 1 � ' ' ! CZlzy limo.-4_7 x-.z..fsz x_._D.1! 4 I D•_� 7�c,1F,!s. � i I I C`c. �_� Jn �.v. I Q,n.u�y_,e - _/�2S_X-D �. 7TXL-°I 3_L_ )(__D•_l_ _ 7-G_�_ s �p'._-7 I 3s_4� ' .�—_I�-- 1 .�I + I {'1 - p �_�_L/4 - S• b I o � I I L � �_ (r - I i � � (• 4 9 i � % . ---- Shy i _h -{—_r F1�Zt.-. bo - ! t—�-- - 1 Ii ! ; GIA , c�r/ _ ' - 42 S X S.G 1 I X D.. 43 'X _ O/ —Tp G,F•J, D E /!•0Z f1 [1 I I tool I U001 I t000 I STEWART&ASSOCIATES 10 4S82 9 3DRFM, FORAX T COLLINS, CO 80521 Consulting Engineers and Surveyors 82 By: ,Q• A-.2. Date: Z, zar) Client: po L) Dz 6 Ir. N oo t- Di r r. Sheet No. 2 of Project: [ /ki rnLm Tg� 14/o/f 5"LgooL- C L.A rr,Po() m�l=sEr/e- tTY A DptT/0A/ Subject: jZ 7 t--- A) Ti p Al M A r / n, A a P R M / ©z yge H tJ To ,e IG _I iNt_L u,He-TN--.--��% C.vmieO.vT_:_D_E7, r: 7,(au _T 5—j.8rt?6__! x�-96.r_.0_Z:4.__� )— -?A ! 0 _j7, 3_9G�_ �--r 6 9 G , --- % Z �o- I! p zJB� 9 0 i• Z o ' -' -- {—s—! —� /i 9 ,4-- lb -7 �- /3 14-? _ 4-1;; I 9:Sa4 1 ! t i � i 1 I ' I j r I —fi , ! 1 T �., �fv -o f1. 90 rzo STEWART&ASSOCIATES Consulting Engineers and Surveyors I I I I I I I I I I I I I I I I I I 103 S. MELDRUM, FORT COLLINS, CO 80521 PH. 482-9331 FAX 482-9382 By: FIA. ie Date: () c,T 2, 7o/1 1 Client: Po v -o a & Sc, Ho o D I As Sheet No. / 0 of Project: L i A) arn- Ai-_�,le. i a A4 _�c a o & L.. r L_ tqs, rQ QQ M /r-.QGlL.I A b r:> L r:/of i Subject: n T—= ME-- A I -F 10 AJ \Z Q L () M 5 C A I-C UL� A r)OA) —7-1 J- -A r--- T7 +1 IT Ye LA AX -B UIA L-A -C-> TT�' tt 'Ta F-r3 1 0 4.674— 7' iTJ 1-14 T H_ I L-L i +1 iT _T T 7_1 1 1 1 Fri I I I LI 1 /I CONSTRUCTION SEQUENCE PROJECT: L/AIcOLAi --Tr—.)/ie N I�CHVOL- CLASlC60N/FAc,L1rY14D91T1V,) STANDARD FORM C SL QLZNCE. FOR 0 N L Y COINPLETED BY: R—A/L � DATE: at i 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. tool YEAR I I ------MONTH I T 1 F ----------- ---- ---------- OVERLOT GRADING WIND EROSION CONTROL ' Soil Roughing Perimeter Barrier Additional Barriers ' Vegetative Methods Soil Sealant Other 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 FOVNDA,"'/on1 VEGETATIVE: Permanent Seed Planting Mulching/Sealant Temporary Seed Planting Sod Installation Nettings/Mats/Blankets Other ' ----------------------------------- STRUCTURES: INSTALLED BY IMIA T IA f� I r I I I � I I I t s 's ; I � I MAINTAINED BY ' VEGETATION%MULCHING CONTRACTOR DATE SUBMITTED APPROVED BY CITY OF FORT COLLINS ON ' HDI/SF—C:1989 v.. ' JA_:; t?': 1991 8-20 DESIGN CRITERIA I ?_ _RAINFALL --------------------------------------------------------------------- PERFORMANCE STANDARD EVALUATION PROJECT: L+NCot.A;Tp—jq/GmseHeoi- CLAwzv0*1F4e,&„Ygop STANDARD FORM A lCOMPLETED BY: -------------------------------------------------------------- 9 t4 0- DATE: Ja. 3o,zna� DEVELOPEDIERODIBILITY1 ISUBBASIN- --it- ZONE I ----------- Asb (ac) Lsb. (ft) Ssb (w) Lb .(feet) Sb' (w) ------- PS (w) TO,4L � TE• A4ODee,4tEl � -----------------------------------I------- 0-'?&A,l ZLOF7.l � 0,77 i 1 ZG0 I ( 0.77 I' 7¢,,S I IIl i __________________ DI/SF=A:1969 ►3 EFFECTIVENESS CALCULATIONS PROJECT: 1,webim -74 Pte,#1-rcm*#L C�.4r/2uoh F.tGia�Ty Qpp�T/o ff/ STANDARD FORM B COMPLETED BY: R 4 p DATE: Ja,,: 30. zoos Erosion Control C-Factor P-Factor Method Value Value Comment 4,e s 6,C ov v p b o D /.00 U. 4-I Ac, Fo N D /i T<o iJ 6. 6 1 /. 00 O. 45 Ac. 5ILT FE)vcB /,00 0150 S -r'R AU) 8.4 LG ).00 0.80 MAJOR PS SUB AREA BASIN ($) BASIN (Ac) CALCULATIONS W el T VVIA) C- 7f s � IoTAL. 'DzivE Jr 76 ULr-D• C = /'0o X 05/) i- (� 0► X li'4s/ 0,9(0 - O,SI + 0,004-5 O,S¢ b• 9G (LUTD f = 0•50 A 0,90 = 0• g-0 (0.S4A 0,¢o)J X /00 = 7g,,p s^ a'} r Wm r,u m.mem 9 - \ j� Al. rotlw 4 ♦ i- I 1 1 1 I 1 I NKWI Owe I OvrrAu cue • °^'1F I • cvnm ; 7 ' .. WNWS slue rr=.w• well srov SO 0 JO FO 80 LINCOLN JUNIOR HIGH SCHOOL s^AWAAx r � 7 e^ flau OR1WWa S'G!£ - FE£T ---------J 1 I I I DRIVEWAY SECTION I I I NT.S LEGEND I I I —N—W—W WIiER LIRE L__________________J L____I—s—s—s— SEWER LINE I —0—e-0— oLs LINE _....'We...___.._ EX6L CON FOUR F'ROPoSEO CON/OUR ________________-_x. _______.____ ...__�__—_ __ I aax ExISf. SPoTf16YELPoA _-_"___':1-__.___.-r•4�^-�___ ______.__'__--r-"=--�--- _.�_��-- :°°-_ 9 ,r m.a.r •aw PROPoSED SPoI E(EYAn0.4 r _. _ _ ®r. w mF wove �•"^•"'^••�^^"•••� EXIST. CURB h CUnER P MN le �• - 1 NEW CURB d' CUTIER j__.i� ws.•W 1A .:;...Nr IIIII 9 a B .1 N LINE 9 L___� m wmroems µ° f0 n,4 —x—x—x—x— SrLT FENCE • e� ® SVUW NLES I 1 BASIN I IN Y A MEM oss Ac ��}} L's '`� YI ♦ ' ..T� —�T• ,fir, `. I `+ j 4 ate• �' .e.., L - - 1 ° FlN. FLR. >= 37.00 .— q P 7 e ' I—�;� —ss q at ._ . W �wlww. BASIN 11 ° a „yn ___-__ __ y4___�_tq?, _ _ ,__�_ J__i __ ___ ,�------------ .' IiY a MEre0.,9AC. �� � s-y„• xer � Py+ e r • y.• d,ry - aw.mroaWwt @ _ w............... _..... '. Pw.lw.area •amP­ A H 1___ . =MOON ; ===ME r WO m N 10 0 SECTION rArr - rArr W W— AT LAN I 14e M'51111.CI f'MAe�PAx� IAWL MVIZON I•} Ifi Ian - sz, tryNcc� v �„„e- fwVF2% W W W— E DRIVE n - WIICT IwE L OPr ,\ O o""`� -- -- —------ ------ ------- p EROSM COMROL NOTES- # VVIIVVII IV, bN.l a nets4 w,n eV, m I,, �eydruu•.aew..✓illegal w wra Y x.•Nr._�,mwbroFN.�m.F�n..,,•r�e�wm sa . mtlm memo •1i b Fae4 ar m. ororw.on rvm m lb mwrrvnkn �pnru I F � Fvib.uln s Fr avwe vN.r.e.aN. m.cm.. oar, ae ew:e. ,e.ra ..wn. 6 abA�...ea,.<e, rmFRW.wged me.bNWbF r.W..•m.F..,.a,.mW..4.,b.. ,..r..,b._r,�a,eFeer,a• : mm rare+wur meer4( rbMe..rwy wrwara...(area I ��e..eJ •+wr.e *rare .re area +.. ...e.e.. �aroa b e.•W.a sue. meats, W F- - n ImW WmmbW bew l./ �F mars m) m ro+w r.W 1)1, ^r ew.,r m.ed ((.-v IL.a a�veW. •,j "` . w.mF.F..w-e Imp,: urr�wrrb.aau»e.�:.urv,rr.ru m cmVI - . mrw'.ab -V wlw d°e1. 1baa.r m�R� '. CI'�. pV �.�i:.. var.r+rbmrnry.rFF' • All 'ems �' � 0' rewltecem, m0,0 V .°. ee,,.e.r,,.,,a.....bl ®e. so as brm _r,b..ry sa Wm.•r r.e ra..r.• wmrwrm �n..n.. uogl.n �r..,.�.�.r .. mew . ..anN mm.r...m r.,..;z...s .e.:.� ,. ,�re.n., n. e. n.e.e.,e i w�. e,n .b,... 1wlw,r..,nr.•al �m..rm AI�rm. �. WVO�,.°•.n 2,.. .•. .,..tV 1 City of Fort Collins, Colorado UTILITY PLAN APPROVAL APPROVED: City Eyiw Cots CHECKED BY. k1A Wop1N t Woelemr . U6'Ny Lb CHECKED BY.. 41pilA /O-t-G sror.r vW vtn;y eeb CHECKED BY,. ron. a R«N.ro� we. CHECKED BY.. IroXic Gpinex Lbb CHECKED BY ca. 9 NUMBER 3 m 5