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Stormwater Management Summary TTO SSOCIA rES PROJECT 50¥.. \) ~\ CALCULATED BY [1 J~O JOB NO. 2~oL/-oìo/ DATE-LI 2. 7 los SHEET NO. OF ENGINEERS & LAND SURVEYORS, INC. 9 WEST DIVISION STREET· BUFFALO, MINN. 55313· (763) 682·4727 FAX (763) 682-3522 r-·--'^-r----~-<-~-·--<'~ r·-·--~~··--~<"'>" ¡ -""~~-"·~"-"T-~~~~-¡~~-~-~"-~<r ! I ¡ ¡ ¡« < I .1J ¡. I Sfot rmw~ ~f1eme~+C ~~¥J:J" 1--- I ¡ I .. t I ! , ¡ ! ¡ ¡ _ L~_,_._".<,.~._L_,__._._._."_L~<~. ¡ '~. ! i f ~, ~ i ~~\L~ï~lcW+!:~:O i eo~f ~t~ W ·I_L._L ! ! 1\0fX>~e.ð co~d~-kon; 'i+-DrìÎ\J)+k~: . L .««« «««<. <.«... «<<<......"..<..!.. .««60D3 .~cj ".. p. cf"Dpu~~N«<' .««(see. «r-+:r-Q,..Lh~d «« do~-h I ' I J' . ·T'······l......j_il~~II~l}pi~~t~Ç~~ft·,æ·t[~E¥FTt=¡ g ; , ; ¡;I~fkf],t.IJ~El~L:rr!rttJII~ct~-~Ef~~~~ '1Icl,:~~i i , . , , , , , ¡ .. ¡ ¡.. ...'...... ....·............1....... , ¡ :1 , ¥ª+l==~-rI~¡+' , I _tt-ttJ_:l ..... .1.... .,' i jIUTLET! "'TL3,'ì~~!uL_LI- LID~1Li ~: : i ~ , . . ¡ d} fr~~4. + C1rhi J IWC:-- CtU~l~lšd «. · · . L_±h~ ..:e~~~JLÜ(tL~~...:b2r--Qq>~ · i -="1 ~ltoLl±JA!j'\-~v=i~:"<kH-;-LcIi¡~~t+J.Tt+-LI ....'.... ....... f...~b..~......poPJ.··· ...ç!..(.d...Jf\..cxrt.....)h.CU4-.....,s:lli·q-~4t-e-···-+ø·······(J)~r~..v'].........+.......<.. ············1··· ....tk\.~....... ·J<þQ'i~ls-fvx~ry\:L··IIJq~4reCLCtcl.:b'ûnCkl _^"'o__~_o__L_~ ~~~~~~~f~r-~~~_d~~::i^"~~~~; J~ :Uol~ ; 04-0702 Prepared by Otto Associates, Inc. HydroCAO® 7.00 sIn 003113 © 1986-2003 Applied Microcomputer Systems Type /I 24-hr1 DO-year Rainfal/=6.00" Page 1 1/27/2005 Runoff 5ubcatchment 15: Existing = 3.10 cfs @ 12.63 hrs, Volume= 0.445 af, Depth= 1.93" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 100-year Rainfall=6.00" Area (a c) 0.300 1.000 1.470 2.770 CN Description 98 Paved parking & roofs 61 > 75% Grass cover, Good, HSG B 58 Woods/grass comb., Good, HSG B 63 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ftlft) (ftlsec) ( cfs ) 50.6 300 0.0250 0.1 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 2.80" 7.5 325 0.0210 0.7 Shallow Concentrated Flow, Woodland Kv= 5.0 fps 58.1 625 Total Runoff 5ubcatchment 25: Proposed = 5.55 cfs @ 12.44 hrs, Volume= 0.647 af, Depth= 2.80" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 100-year Rainfal/=6.00" Area (a c) 0.900 0.350 1.520 2.770 CN Description 98 Paved parking & roofs 58 Woods/grass comb., Good, HSG B 61 >75% Grass cover, Good, HSG B 73 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ftlft) (ftlsec) ( cfs ) 45.2 300 0.0330 0.1 Sheet Flow, Woods: Light underbrush n= 0.400 P2= 2.80" 0.2 70 0.0100 5.3 6.46 Circular Channel (pipe), Diam= 15.0" Area= 1.2 sf Perim= 3.9' r= 0.31' n= 0.013 45.4 370 Total 04-0702 Prepared by Otto Associates, Inc. HydroCAD® 7.00 sIn 003113 © 1986-2003 Applied Microcomputer Systems Type II 24-hr 10-year Rainfal/=4.10" Page 1 2/8/2005 5ubcatchment 35: Proposed to Pond Runoff = 24.41 cfs @ 12.08 hrs, Volume= 1.461 af, Depth= 1.45" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 10-year Rainfall=4.10" Area (ac) 12.090 CN Description 73 T c Length (min) (feet) 15.0 Slope Velocity Capacity Description (ftIft) (ftIsec) (cfs) Direct Entry, 04-0702 Prepared by Otto Associates, Inc. HydroCAO® 7.00 sIn 003113 © 1986-2003 Applied Microcomputer Systems Type II 24-hr 10-year Rainfal/=4.10" Page 2 2/8/2005 I nflow Area = Inflow = Outflow = Primary = Pond 1 P: Proposed Pond 12.090 ac, Inflow Depth = 1.45" for 24.41 cfs @ 12.08 hrs, Volume= 9.10 cfs @ 12.31 hrs, Volume= 9.10 cfs @ 12.31 hrs, Volume= 1 O-year event 1.461 af 1.353 af, Atten= 63%, Lag= 13.7 min 1.353 af Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 920.68' @ 12.31 hrs Surf.Area= 13,418 sf Storage= 22,115 cf Plug-Flow detention time= 63.6 min calculated for 1.353 af (93% of inflow) Center-of-Mass det. time= 37.9 min ( 845.1 - 807.2 ) # 1 Invert 918.90' Elevation (feet) 918.90 920.00 922.00 922.50 # Routing 1 Primary Avail. Storage Storage Description 48,795 cf Custom Stage Data (Prismatic) Listed below Surf.Area (sq-ft) 10,690 12,435 15,340 17,865 Cum.Store ( cubic-feet) o 12,719 40,494 48,795 Inc.Store (cubic-feet) o 12,719 27,775 8,301 Invert Outlet Devices 918.90' 24.0" x 62.0' long Culvert CMP, end-section conforming to fill, Ke= 0.500 Outlet Invert= 918.44' S= 0.0074 'I' n= 0.023 Cc= 0.900 Primary OutFlow Max=9.09 cfs @ 12.31 hrs HW=920.67' (Free Discharge) L1=Culvert (Barrel Controls 9.09 cfs @ 4.1 fps) 04-0702 Prepared by Otto Associates, Inc. HydroCAO® 7.00 sIn 003113 © 1986-2003 Applied Microcomputer Systems Type /I 24-hr 100-year Rainfal/=6.00" Page 3 2/8/2005 5ubcatchment 35: Proposed to Pond Runoff = 47.94 cfs @ 12.07 hrs, Volume= 2.859 at, Depth= 2.84" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 100-year Raintall=6.00" Area (ac) 12.090 CN Description 73 T c Length (min) (teet) 15.0 Slope Velocity Capacity Description (fUft) (fUsee) (cts) Direct Entry, 04-0702 Prepared by Otto Associates, Inc. HydroCAO® 7.00 sIn 003113 © 1986-2003 Applied Microcomputer Systems Type II 24-hr 100-year Rainfal/=6.00" Page 4 2/8/2005 Inflow Area = Inflow = Outflow = Primary = Pond 1 P: Proposed Pond 12.090 ac, Inflow Depth = 2.84" for 47.94 cfs @ 12.07 hrs, Volume= 17.07 cfs @ 12.30 hrs, Volume= 17.07 cfs @ 12.30 hrs, Volume= 100-year event 2.859 af 2.721 af, Atten= 64%, Lag= 13.9 min 2.721 af Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 922.24' @ 12.30 hrs Surf.Area= 16,530 sf Storage= 44,407 cf Plug-Flow detention time= 52.9 mìn calculated for 2.712 af (95% of inflow) Center-of-Mass det. time= 35.4 min ( 828.6 - 793.2 ) # 1 Invert 918.90' Elevation (feet) 918.90 920.00 922.00 922.50 # Routing 1 Primary Avail.Storage Storage Description 48,795 cf Custom Stage Data (Prismatic) Listed below Surf.Area (sq-ft) 10,690 12,435 15,340 17,865 Inc.Store (cubic-feet) o 12,719 27,775 8,301 Cum.Store (cubic-feet) o 12,719 40,494 48,795 I nvert Outlet Devices 918.90' 24.0" x 62.0' long Culvert CMP, end-section conforming to fill, Ke= 0.500 Outlet Invert= 918.44' S= 0.0074 '/' n= 0.023 Cc= 0.900 Primary OutFlow Max=17.06 cfs @ 12.30 hrs HW=922.23' (Free Discharge) 'L.1=Culvert (Barrel Controls 17.06 cfs @ 5.4 fps) I I' '\ , \. , , " , \. , \. 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" , .... ~ , , ~ " " " '\ '\ ~ ~ , , '\ f--- f--- -- -f-- r- '- .Eëa ( ).s= ~ß ( ) ~ ( )(I) .s=C\ en . enO 1: II - 01 c- o( ) en en ( ) C'Ø ë:: 0 ::J ( ) o£ I I I I I I I I I II r " r I I I " 1\ '\. " " , , I\. , I\. , , \. , '\ '\ , , I' , '\ , \ , " \ \ , , '\. , , 1\ \ m (1)(1) C\ (O 00 cLri. II o \. I' , " , " " r--. lO N ...... çp ú\ o LO q M sa4Ju~ '(b) jjounJ +JaJ~a Figure 7.1-3: Solution of the runoff equation. N o-i .-4 .-4 ( o'/"" ì~ ~ ~ \ -.:::J " - ~~ -0 o .-4 O't '> o 11 c:t~ ~ ~ ~ @ "5 « c 0 "r-cf ~ ~ g,& Ln~ J '-' 0) ,.... \0 0... - o:;t" N r- \' 01 «) r- o o II d ~ 7- <C V II 7.1-9 ~'. '^ 0 \0 0- ¡'i\ T N r- ",1\ .J) 11) J ..j r()::r-r{) ....,;.,. \¡) tf) 1.01./1 ~JV1(' ::r r 0, rf\ :r N~, L :>()<f"' ~¡-:~ - - - ~ rr 0- (). .:r II \1 \r & 'z ;; ~ « N rfI ~~ 'v") . . 1\ I' - ~($J ~ \() o 0 <£ )( .J .« r- r ~ 5 J E ~