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2005-09-13 Transmittal Prelim, Final Plat, Hydrology, Storm SewerWestwood Professional Services, Inc. TRANSMITTAL ate: September 13, 2005 To: Daniel Tempel Granite City Real Estate 58 10th Avenue South Waite Park, MN 56387 From: Ryan Gideon , Regarding: Albertville Phase 2 3701 12th Street North Suite 206 St. Cloud, MN 56303 Phone: 320-253-9495 Fax: 320-253-8737 Toll free:1-800-270-9495 E-mail wps~westwoodps.com sr. aouo TWIN CITIES/METRO BRAINERo Proj. No.: Items: 20055134.00 CO No Description 6 Full-Size Engineering, Preliminary Plat, Final Plat 2 11x17 Engineering, Preliminary Plat, Final Plat 2 Hydrology Calculations 2 Storm Sewer Sizing Spreadsheet Purpose: Remarks: As you requested Enclosed are the documents you requested for your submittal to the city Please feel free to contact me if you need anything additional or have revisions/comments. 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Z O ~,,, ~ ~ \ A --1 .~ ~~ G tD O O Q O N N ~ Q ~ N xx O O ~ O N N~N (D N ~ ~ ~ f~ i~ O ~ ~ N ~ ~ N Oo Z ~ N ~ N CT < c7 ~ ~ d N J1 ~J't S 20055134-post Type 11 24-hr 100-Yr Rainfall=5.90" Prepared by Westwood Professional Sevices Page 2 HydroCAD® 7.10 s/n 002396 ©2005 HydroCAD Software Solutions LLC 9/13/2005 Time span=5.00-20.00 hrs, dt=0.05 hrs, 301 points Runoff by SCS TR-20 method, UH=SCS Reach routing by Stor-Ind+Trans method -Pond routing by Stor-Ind method Subcatchment 2S: From Linwood Drive Runoff Area=7.280 ac Runoff Depth>3.93" Tc=13.8 min CN=85 Runoff=39.98 cfs 2.383 of Subcatchment 3S: From North of 68th Runoff Area=5.500 ac Runoff Depth>4.24" Tc=15.0 min CN=88 Runoff=30.81 cfs 1.942 of Subcatchment 4S: West Laketowne Drive Runoff Area=0.900 ac Runoff Depth>4.24" Tc=10.0 min CN=88 Runoff=5.88 cfs 0.318 of Subcatchment 5S: Outlot Runoff Area=7.720 ac Runoff Depth>4.24" Tc=10.0 min CN=88 Runoff=50.41 cfs 2.730 of Pond 1P: Pond 3 Peak Elev=956.13' Storage=3.002 of Inflow=123.93 cfs 7.374 of Outflow=36.07 cfs 6.977 of Total Runoff Area = 21.400 ac Runoff Volume = 7.374 of Average Runoff Depth = 4.13" 20055134-post Type 11 24-hr 100-Yr Rainfall=5.90" Prepared by Westwood Professional Sevices Page 3 HydroCAD~ 7.10 s/n 002396 ©2005 HydroCAD Software Solutions LLC 9/13/2005 Subcatchment 2S: From Linwood Drive Runoff = 39.98 cfs @ 12.05 hrs, Volume= 2.383 af, Depth> 3.93" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 100-Yr Rainfall=5.90" Area (ac) CN Description 7.280 85 Urban commercial, 85% imp, HSG C Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 13.8 Direct Entry, From Storm Sewer Comp Sheet Subcatchment 3S: From North of 68th Runoff = 30.81 cfs @ 12.06 hrs, Volume= 1.942 af, Depth> 4.24" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 100-Yr Rainfall=5.90" Area (ac) CN Description 5.500 88 Urban commercial, 85% imp, HSG C Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 15.0 Direct Entry, Subcatchment 4S: West Laketowne Drive Runoff = 5.88 cfs @ 12.01 hrs, Volume= 0.318 af, Depth> 4.24" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 100-Yr Rainfall=5.90" Area (ac) CN Description 0.900 88 Streets and Boulevards Tc Length Slope Velocity Capacity Description _(min) (feet) (ft/ft) (ft/sec) (cfs) 10.0 Direct Entry, Direct Subcatchment 5S: Outlot Runoff = 50.41 cfs @ 12.01 hrs, Volume= 2.730 af, Depth> 4.24" Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 100-Yr Rainfall=5.90" 20055134-post Type lI 24-hr 100-Yr Rainfall=5.90" Prepared by Westwood Professional Sevices Page 4 HydroCAD® 7.10 s/n 002396 ©2005 HydroCAD Software Solutions LLC 9/13/2005 Area (ac) CN Description 7.720 88 Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 10.0 Direct Entry, Direct Pond 1 P: Pond 3 Inflow Area = 21.400 ac, Inflow Depth > 4.13" for 100-Yr event Inflow = 123.93 cfs @ 12.03 hrs, Volume= 7.374 of Outflow = 36.07 cfs @ 12.27 hrs, Volume= 6.977 af, Atten= 71 %, Lag= 14.4 min Primary = 36.07 cfs @ 12.27 hrs, Volume= 6.977 of Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Peak Elev= 956.13' @ 12.27 hrs Surf.Area= 1.179 ac Storage= 3.002 of Plug-Flow detention time= 72.9 min calculated for 6.953 of (94% of inflow) Center-of-Mass det. time= 52.6 min (815.0 - 762.4 ) Volume Invert Avail.Storage Storage Description #1 952.70' 4.079 of Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (acres) (acre-feet) (acre-feet) 952.70 0.572 0.000 0.000 954.00 0.798 0.890 0.890 956.00 1.161 1.959 2.849 957.00 1.299 1.230 4.079 Device Routing Invert Outlet Devices #1 Primary 952.75' 27.0" x 274.0' long Culvert RCP, end-section conforming to fill, Ke= 0.500 Outlet Invert= 950.91' S= 0.0067'/' Cc= 0.900 n= 0.013 #2 Primary 953.87' 18.0" x 96.0' long Culvert RCP, end-section conforming to fill, Ke= 0.500 Outlet Invert= 953.04' S= 0.0086 '/' Cc= 0.900 n= 0.013 Primary OutFlow Max=36.03 cfs @ 12.27 hrs HW=956.13' (Free Discharge) ~1=Culvert (Barrel Controls 26.14 cfs @ 6.6 fps) 2=Culvert (Barrel Controls 9.90 cfs @ 5.6 fps)