Loading...
The URL can be used to link to this page
Your browser does not support the video tag.
Stormwater Calculations 2-15-08
[. --~- ._~------'- _.-, ~-"" ""~_~~~_'_"~~~'~'~_"'c__~_~"~'~~~""_~ ,--""~".~..,,,,,,,,,~---~,,,,',,,,,_,,,,,,,,--'---...--,....,.,.......~ ~..__.....-.---~.~.- ~ ..~ "--," ~~,..~.~ ..- ".-~ 1 , .....,_................._...._.*._~.............. __._~____'"A_"...-..._...........~_...t Engineering . Planning . Surveying ~;l? l'-~:-\ f" ~ lu~U U:O .J~t~ ~.-o mcCDmb, Franl! RDns 't' Associates, Inc. MEMORANDUM To: City of Chanhassen Date: February 15,2008 errv OF CHAIJHASSi:I\j Subject: Stormwater Calculations RECEIVED Walgreens Redevelopment MFRA#17252 FEB :: 5 2008 From: Sean CUlle~ . CP.;HHASSHI "","ING DE" Attached are the calculations for the storm sewer pipe sizing. The runoff from the site in its current condition is collected in the storm sewer system and discharged at two points to the stormwater pond directly south of the site. The redevelopment will not result in a significant change in the overall impervious area or drainage patterns on the site. We reviewed the capacity of the existing pipe system for the 10-yearrainfall event and attempted to keep the drainage patterns for the new development similar to the existing conditions. Assumptions were made to the flow contributions from the off-site runoff and stormwater pond northeast of the site. The following is a summary of our calculations: Current peak 10- year Proposed peak 10- year discharge rate discharge rate West Discharge 26.37 cfs 24.39 cfs East Discharge 5.37 cfs 6.14 cfs Total Discharge to Pond 31.74 cfs 30.53 cfs Please call me if you have any questions. An Equal Opportunity Employer 1480028/17 Avenue North, Suite 140 . Plymouth, Minnesota . 55447 phone 763/476-6010 . fax 763/476-8532 . e-mail: mfra@mfra.com STORM SEWER PIPE SIZING CALCULATIONS (EXISTING STRUCTURES) 2/15/2008 CALCULATED BY:CDG DATE: 2/15/08 CLIENT: ANXON, INC. STORMFREV.:IOYEAR REVISED BY: DATE: PROJECT: W ALGREENS SHEET I OF I FFE JOB NO. 17252 LINE NO. STRUCTURE SUB- AREA TIME OF FLOW INTEN'Y RUNOFF SLOPE SIZE CAPACITY VELOCITY DEPTH RJM INV DROP INV DROPTHR STRUCT PIPE DEPTH VELOCITY 5 YR RAINFALL 10 YR RAINFALL FROM TO LENGTH AREA TOTAL(CA COEFF T.O.C. T.O.F. T I Q= CIA cfs FT 1FT IN. CFS FULL ACTUAL OF FLOW UPPER LOWER STRUCT. DEPTH COVER RATIO RATIO INTENSITY INTENSITY South Line E4 E5 30 0.83 0.91 0.90 15.00 0.00 15.00 4.75 4.32 1.50% 24 27.54 8.77 6.42 0.55 997.82 983.32 0.45 982.87 0.00 14.50 12.50 0.27 0.73 4.11 4.75 E5 E6 101 0.31 1.19 0.90 15.00 0.08 15.08 4.74 5.63 1.01% 24 22.60 7.19 5.96 0.68 991.87 982.87 1.02 981.85 0.00 9.00 7.00 0.34 0.83 4.10 4.74 E6 E7 156 0.19 2.27 0.90 15.08 0.28 15.36 4.70 10.67 1.70% 24 29.32 9.33 8.54 0.83 993.53 981.85 2.65 979.20 0.00 11.68 9.68 0.41 0.92 4.06 4.70 E7 E8 107 1.52 3.64 0.90 15.36 0.30 15.66 4.66 16.96 1.85% 24 30.59 9.74 10.03 1.06 991.90 979.20 1.98 977.22 0.00 12.70 10.70 0.53 1.03 4.03 4.66 E8 E9 162 0.85 5.17 0.90 15.66 0.18 15.84 4.64 23.98 1.56% 24 28.09 8.94 9.99 1.41 992.82 977.22 2.53 974.69 1.00 15.60 13.60 0.71 1.12 4.01 4.64 E9 E 10 127 0.22 5.36 0.90 15.84 0.27 16.11 4.61 24.72 1.21% 24 24.74 7.87 8.98 1.64 994.09 973.69 1.54 972.15 0.00 20.40 18.40 0.82 1.14 3.98 4.61 E 10 FES II 170 0.44 5.76 0.90 16.11 0.24 16.35 4.58 26.37 3.15% 24 39.91 12.70 13.62 1.20 993.83 972.15 5.36 966.80 #REF! 21.68 19.68 0.60 1.07 3.95 4.58 E 14 E4 17 0.18 0.16 0.90 15.00 0.00 15.00 4.75 0.77 2.23% 24 33.61 10.70 4.24 0.19 997.41 867.40 0.38 867.02 0.00 130.01 128.01 0.10 0.40 4.11 4./5 E 15 E 10 122 0.73 0.00 0.90 15.00 0.00 15.00 4.75 3.12 0.60% 12 2.74 3.49 2.75 1.06 992.31 988.51 0.73 987.78 0.00 3.80 2.80 1.0 0.79 4.11 4.15 E 16 E6 81 0.09 0.74 0.90 15.00 0.74 15.74 4.65 3.44 1.05% 12 3.63 4.62 5.24 0.77 993.08 987.78 0.85 986.93 #REF! 5.30 4.30 0.77 1.13 4.02 4.65 E 17 E 18 152 0.54 0.49 0.90 15.00 0.00 15.00 4.75 2.31 1.23% l2 3.93 5.00 5.23 0.55 993.32 988.82 1.87 986.95 5.29 4.50 3.50 0.55 1.04 4. 4.1~ E 18 E8 105 0.31 0.77 0.90 15.00 0.48 15.48 4.69 3.59 3.65% 15 12.27 10.00 8.63 0.46 992.66 981.66 3.83 977.83 #REF! 11.00 9.75 0.37 0.86 4.05 4.69 E 19 E6 15 0.19 0.17 0.90 15.00 0.00 15.00 4.75 0.81 3.05% 24 39.27 12.50 4.80 0.18 993.44 990.65 0.46 990.19 0.00 2.79 0.79 0.09 0.38 4. 4./: E20 E21 145 0.32 0.29 0.90 15.00 0.00 15.00 4.75 1.37 2.43% 12 5.52 7.03 5.81 0.34 994.37 988.47 3.52 984.95 0.00 5.90 4.90 0.34 0.83 4. 4./: E21 FES 22 213 0.33 1.14 0.90 15.00 0.42 15.42 4.70 5.37 8.64% 12 10.41 13.25 13.3~ 0.51 994.55 984.95 18.40 966.54 0.00 9.60 8.60 0.51 1.01 4.06 4.10 E2 E 21 180 0.62 0.56 0.90 15.00 0.00 15.00 4.75 2.65 1.75% 12 4.69 5.97 6.17 0.54 994.21 988.11 3.15 984.96 0.00 6.10 5.10 0.54 1.04 4.11 4.15 CITY OF CHANHASSEN RECEIVED FEP 1 5 2008 CHANH.ASScN rJLAI'lNiM3 OEPT L:\PROJ ECTS\ANX 17252\Reports\Eng ineering\stm-calcs,xls ..---/....------ -995_ - - \_:~-~~~~~~~~~~~~~~~~~~~~~!~~!.:~/ : ..____ " ~ _ -..., \ INV. E EL"'990.19 1\ ---_:::__:::.;~.:::~~~~'-=--=__= -=~_;_~=-~-- ------, / I -EX CB RIM-99".B~ INV-99D.65 " ................--- SA SIGN ------------==;,' ./ (' I STORl.l l.lH I RlU EL- 995.75 I INV. EL-9BJ.25 ~ ~., '~~:?;.;;: -'~;~5;::~-fu' ~~'~----- '.':, .. " . <, '" ,:', < s.~/:., :.> :: .' ",' .. '!l 24~ RCP <<-<<-<<- / ~/ . :; . .- lD ~~ ! B~~ l;! )C:::i:: ~J , , , , , , , , , , , , '..0", 0"\,\\ /t14 \ , , '.9", "\'" " ij . ~ , .' , , 'lQ Va, , ~:. ~:\ "700 J..........____ ------1002______ B~ 9& " EX CB RIl.lEL-,OOJ.SO INII El-997.40 '- ", ;5---\ :6~~J5 \ \ \ \ I I :-:,/ ,<::,0 ,/ ",,,,,,,,,, ..b -"''''i- r::P" *,r:F"" t\{...."'.. ~hs""---,()() o '\/ ~ ----Z-O' ... ~ >- <J: ~ ~ ~ r:J;jC:/' ;E2 ~tJ~// ::> C/).-- Zu '. Ja-/ -1r",~,l:~ -, ,,,,": ,/ f ~ __\006--- c;. " ~..." "" ~ H ,.. ,,/~ /J' / ',/ 4,'\ .' <J> .,#. 001......... ,: '. -~~ c.:,/ , ~)I--tB........\ -: ,:' // ~~ g:~~~~6~7 4 -' oo! )//~/ <>- " I I / / fJ" ~~ '-,f <::/" / / R>/ .//~ / " ./ fJe! K~ \7ii / I I I I I I I I J I /---" o ~ .. EJe! x'" ...,~ii LEGEND CURS & GUTTER STORM SEVv'ER SANITARY SE'NER FORCEM~N (SAN.) WATERM.AJN EASEMENT GAS UNE ELECTRIC TaEPHONE on g i PROPOSED EXISTING 0->>__ O--"-Q e.-> ---0 o--~--{) o-->FW>--o o-~N"---O >+--1--;' --,-----Q- -UG- -IJC- -UE--u(_ -UT- -UT- ~ o 30 --- - - Scale In Feet Enginee!ing . Pfamjrg . SuNeying mfFRA McCombs Frank Roos Associates, Inc. l4/ID2BIII....... N:m, SuM 140 ~.............65W p/mo; 7B3I~O. iIc 763HlfH1532 ~: WoWI,n-ft.c:an Client Anxon, Inc. 601 Marquelle Ave, Suite 100 Minneap.lis, MN 55402 612-341-914B Project Walgreens Location SW Quadrant of MN.7 & MN-41 Chanhassen, MN 7700 Mark.1 Blvd P .0, Box 147 Cha.hassen, MN 55317 925-221.1100 Certification ] hereby ~ertlfythlt thll plan, apeclficlltlDn crreport Wit prepmd by m. orunder my direct lup8l'Vliian and thltl am I dulyUc8nled Professlooal ENGINEER underthIIIWlo1th.SlltlofMlnnesola. Sean l. Cullen R1lllstrlllClllNl1. 41911 Date: 02/01/2008 Wlppllelbl&,ll4ntlcl:\lStorIWII~(lllpyoll!D_M*'h. ~lIPDIlllqunt.McComtsfrw*flj)ol~,m. f'lr!m~MNoIfict. Summary Designed: JB;JJ ApprDved: Rl/SC Pbase: Pr!liml/llrY Drawn: JJ/8N Book I Paga: InlUallssue: 02/0112008 Revision History No. Dale By SubmlUall Revision A C2l151Oo! EflW RmllliPIlCryeom-r.ra Sheet Title PROPOSED DRAINAGE Sheet Number Revision 60 , Project No. ANX17252 STORM SEWER PIPE SIZING CALCULATIONS (PROPOSED STRUCTURES) 2/15/2008 CALCULATED BY:CDG DATE: 2115/08 CLIENT: ANXON. INC. STORM FREO.: 10 YEAR REVISED BY: DATE: PROJECT: W ALGREENS SHEET I OF I FFE JOB NO. 17252 LINE NO. STRUCTURE SUB- AREA TIME OF FLOW INTEN'Y RUNOFF SLOPE SIZE CAPACITY VELOCITY DEPTH RL\,f INV DROP INV DROPTHR STRUCT PIPE DEPTH VELOCITY 5 YR RAINFALL 10 YR RAINFALL FROM TO LENGTH AREA TOTAl CA COEFF T.O.C. T.O.F. T (I O~IA cfs FT/FT IN. CFS FULL ACTUAL OF FLOW UPPER LOWER STRUCT. DEPTH COVER RATIO RATIO INTENSITY INTENSITY South Line E4 E5 30 0.83 0.91 0.90 15.00 0.00 15.00 4.75 4.32 1.50% 24 27.54 8.77 6.42 0.55 997.82 983.32 0.45 982.87 0.00 14.50 12.50 0.27 0.73 4.11 4.75 E5 E6 101 0.31 1.19 0.90 15.00 0.08 15.08 4.74 5.63 1.01% 24 22.60 7.19 5.96 0.68 991.87 982.87 1.02 981.85 0.00 9.00 7.00 0.34 0.83 4.10 4.74 E6 STMH 3 63 0.19 2.28 0.90 15.08 0.28 15.36 4.70 10.71 1.70% 24 29.32 9.33 8.55 0.83 993.53 981.85 1.07 980.78 0.00 11.68 9.68 0.41 0.92 4.06 4.70 STMH 3 E7 92 0.00 2.28 1.90 15.36 0.12 15.48 4.69 10.67 1.70% 24 29.32 9.33 8.55 0.83 992.90 980.78 1.56 979.21 0.00 12.12 10.12 0.41 0.92 4.05 4.69 E7 E8 107 0.99 3.17 0.90 15.48 0.18 15.66 4.66 14.78 1.85% 24 30.59 9.74 9.66 0.97 991.90 979.21 1.98 977.24 0.00 12.69 10.69 0.49 0.99 4.03 4.66 E8 E9 162 0.56 4.29 0.90 15.66 0.18 15.85 4.64 19.92 1.56% 24 28.09 8.94 9.71 1.25 992.82 977.24 2.53 974.71 0.00 15.58 13.58 0.63 1.09 4.01 4.64 E9 E 10 127 0.22 4.93 0.90 15.85 0.28 16.13 4.61 22.72 1.21% 24 24.74 7.87 8.89 1.50 994.09 974.71 1.54 973.17 0.00 19.38 17.38 0.75 1.13 3.97 4.61 E 10 FES II 170 0.44 5.33 0.90 16.13 0.24 16.36 4.58 24.39 3.15% 24 39.91 12.70 13.40 1.14 993.83 973.17 5.36 967.82 0.00 20.66 18.66 0.57 1.05 3.95 4.58 E 14 E4 17 0.18 0.16 0.90 15.00 0.00 15.00 4.75 0.77 2.23% 24 33.61 10.70 4.24 0.19 997.41 867.40 0.38 867.02 0.00 130.01 128.01 0.10 0.40 4.11 4. 5 E 15 E 16 122 0.73 0.6 0.90 15.00 0.00 15.00 4.75 3.12 0.60% 12 2.74 3.49 2.75 1.06 ~~2.31 988.51 0.73 987.78 0.00 3.80 2.80 1.06 0.79 4.11 4. EI6 E6 81 0.09 0.74 0.90 15.00 0.74 15.74 4.65 3.44 1.05% 12 3.63 4.62 5.24 0.77 993.08 987.78 0.85 986.93 0.00 5.30 4.30 0.77 1.13 4.02 4.65 E 17 E 18 152 0.35 0.32 0.90 15.00 0.00 15.00 4.75 1.50 1.23% 12 3.93 5.00 4.64 0.42 993.32 988.82 1.87 986.95 5.29 4.50 3.50 0.42 0.93 4.11 4.75 E 18 E8 105 0.00 0.62 0.90 15.00 0.55 15.55 4.68 2.91 3.65% 15 12.27 10.00 8.17 0.42 992.66 981.66 3.83 977.83 0.00 11.00 9.75 0.33 0.82 4.04 4.68 E 19 E6 15 0.20 0.18 0.90 15.00 0.00 15.00 4.75 0.86 3.05% 24 39.27 12.50 4.88 0.19 993.44 990.65 0.46 990.19 0.00 2.79 0.79 0.09 0.39 4.11 4.fb E20 E21 145 0.22 0.45 0.90 15.00 0.00 15.00 4.75 2.14 2.43% 12 5.52 7.03 6.55 0.43 994.37 988.47 3.52 984.95 O.UU 5.90 4.90 0.43 0.93 4. 4.lb E21 FES 22 213 0.33 1.31 0.90 15.00 0.37 15.37 4.70 6.14 8.64% 12 10.41 13.25 13.86 0.55 994.55 984.95 18.40 966.54 0.00 9.60 8.60 0.55 1.05 4.06 4. 0 E23 CBMH 21 180 0.62 0.56 0.90 15.00 0.00 15.00 4.75 2.65 1.75% 12 4.69 5.97 6.17 0.54 994.21 988.11 3.15 984.96 0.00 6.10 5.10 0.54 1.04 4. 1 4. 5 STMH 4 STMH 5 89 0.17 0.15 0.90 15.00 0.00 15.00 4.75 0.73 1.00% 12 3.54 4.51 3.55 0.31 993.50 990.50 0.89 989.65 0.00 3.00 2.00 0.31 0.79 4.11 4.75 STMH 5 STMH 6 59 0.08 0.23 0.90 15.00 0.42 15.42 4.70 1.06 1.00% 12 3.54 4.51 3.91 0.37 993.50 989.65 0.59 989.06 0.00 3.85 2.85 0.37 0.87 4.06 4.70 STMH 6 STMH 3 38 0.08 0.30 0.90 15.42 0.25 15.67 4.66 1.39 1.00% 12 3.54 4.51 4.21 0.43 993.70 989.06 0.44 988.62 0.00 4.64 3.64 0.43 0.93 4.03 4.66 CB I E 18 59 0.34 0.31 0.90 15.00 0.00 15.00 4.75 1.45 1.00% 12 3.54 4.51 4.27 0.44 993.00 989.00 0.59 988.41 0.00 4.00 3.00 0.44 0.95 4.11 4.75 12"FES E9 25 0.49 0.44 0.90 15.00 0.00 15.00 4.75 2.10 1.00% 12 3.54 4.51 4.72 0.56 991.00 991.00 0.25 990.75 0.00 0.00 -1.00 0.56 1.05 4.11 4.fb CB2 E 20 104 0.28 0.25 0.90 15.00 0.00 15.00 4.75 1.20 1.00% 12 3.54 4.51 4.05 0.40 993.70 989.70 1.04 988.66 0.00 4.00 3.00 0.40 0.90 4.11 4. 5 L:\PROJ ECTS\ANX 17252\Reports\Eng ineering\stm-calcs.xls ~ ~ i I ~ I I I I 0 30 60 0- --- , - - Scale In Feel -- --------------......----- ----... - -\}~~:~~~J~~~~~~~!~~~~~~~~~~"'~ [/ 13 f1 1/ -"' I~~. ;;w. E~:59~:.;l\ _______ __ '!NV. E EL-990 19 \ 996 - ___________ ~ . t 995 / / CURB & GUTIEA STORM SE'v'YER S.ANJTARY SEWER FORCEMAlN (SAN.) WATEAMAlN EASEMENT GASUNE ELECTRIC mEPHar~E -EX CB RllJ=f!94.B5 INv-990.65 LEGEND ,------- 1 I I / ------:::_-~~~-~~~~~ -- ..._--------~ ------- E1(7 IQ.9V." '" ~ '\ .- . 0,' //,/'0, // ,~i ~/.~ ~/ ~ e.1 / { ~ , , , , , , , , "'", <\""\ __________..S~l ./ 0,0, (' (f' ~ - -- ~;~::~:,:;::':~;';::;~-,~~ \-;:' -, :::;(/ ... '. ~5_ SJ ~. ',,' " -\j'.,', . ,',' .:.' -...'\ ' ., .:," ' ",' ," -\j 24- RCP <<-<<-<<- ---l.___ /,/ /'" // /" //""" / ,', .. "- ! STQRU t.lH I RII.l [L- 996.75 / lNV. EL-9BJ.25 I," "' "" , , " /-[14 '.9", """"" ~. .:.~ , , , '/0 VO, " ~ ~ ~...~~~ ~;. .-... \ ~ . ,f( ,,' ~ ..",.;' / 0"'" ,0 --- -'100 1______- EX CB RII.I EL-l00J.BO INV U."'997.4Q ~ 00";/ ...,..." ,,,,," . _,," rjJ ,'\F....tP " ,. \ _~""\)--~- 00'-- ,'t'1 ~ '\ ',' \1 " EX C8 . ", \V El.99a.l.~'........ \ / \ / .. ~, !.. .... ' , "', " \ \ o ----2-D' .. >-<:( ~~ Zu l.J -/ ___....J - -:1: OJ UJ:::> 1-0.. ~ Vl , , , , , :<i Er i f./" <Bd ....00 &><:;! /.... :;,....0;....... ",-V>-"";. .1.1>-' ::> ~/r:~' ,,: .,.,' /il , . ,/ 9 {;- ~ " /...Cl /J/ , ' , ' / .i1 ,/ 0>", ~,d>" Q1/ .. ,~~ / ........_\0 ........ -. ,i ~~l-1CI06.67 I ~ .,/ IN\' El=999.67 ~' __\000--' ~/ 00 ,.,,'\ "", , 00{ ...,/;-Cl .:: ..' PROPOSED EXISTING o->>--Io-,,---@ 0->---. o--~--o 0--> F\l >--0 o--)ru1>--Q -1---+ -'---<?- -UG- -UE- -U'T- -Uli- -ll(- -UT_ Engireering . Planning . Suooying IfFRA McCombs Frank Roos Associates, Inc. 7 48Xl28tl A'AWUJ f.arh. SuIa9 140 P/tfrx>Jt>. """"""". 55447 r:J't;nt!;7li3I478<<l70.iIx:~ waDsia: w.o.w.rrft.a::m Client Anxon, Inc. 601 Marquelle Ave, Sullel00 Minneapolis, MN 65402 612.341-9148 Project Walgreens Location SW Quadrant of MN-7 & MN-41 Chanhassen, MN 7700 Markel Blvd P.O. Box 147 Chanbmen, MN 55317 925.227-1100 Certification I h8l'eby certify thlt thIl plan, IpeclfJcatlanorreport wu prepared by me or under my 1lI111l:t supemslon and that lama duly Ucensed ProfesslDflal ENGINEER underthl laws Of the StAtl of Mlnn!SatJ:. Sean L Cullen ReQlllrlUonNa. 41911 Dale: 02/01/2008 MlppllclblI.conllc!lIIfDr...tlQ1tdcopyDlIhI:I.,whId\!I ~:~~=rtIlMcCllmblfmkPoDl~1nD., Summary Designed: JBlJJ Approved: RlJSC Pbase: Preliminary Drawn: JJ/fW Book I Page: InlUallssue: D2ID1/2DDB Revision History No. Date By SubmlUall Revision A C2l1~fRWR..,ItIdPlrClyCD~ Sheet Title EXISTING DRAINAGE Sheet Number Revision Project No. ANX17252