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4 <br /> � �' 1 <br /> 3850 Watertown Road l/6/15 <br /> Qrono MI�1 My� <br /> Proposed Conditions <br /> Proposed Low Area <br /> Elevation Head Area(sq.ft.} Area(acres) Defta V(acre-feet) Volume(acre-feet) <br /> 995.8 0 4306 0.0989 Q,pppp <br /> 0.0217 <br /> 996 0.2 5158 0.1184 0.0217 <br /> 0.7533 <br /> 998 2.2 31348 0.7197 0.7750 <br /> 2.5273 <br /> 1000 4,Z 82828 1.9015 3.3023 <br /> 4.544b <br /> 1002 6,2 116069 2.6646 7,g46g <br /> 5.4480 <br /> 1004 8.2 121263 2.7838 13.2949 <br /> *See attached Proposed Conditions Map for more details. Proposed Conditions <br /> based on proposed grading plan prepared by Gronberg and Associates dated 11-3-14. <br /> HvdroCAD Results <br /> The low area on the 3850 Watertown Road property was modefed in HydraCAD <br /> to de#ermine both the high water level (HWL) and peak dfscharge rates in the <br /> existing and proposed conditions. The low area has been modeled in both the <br /> existing conditions with and without the original draintile. Invert, size, and location <br /> of the original draintile was not availabfe for the modeling process. The original <br /> draintile has been assumed to be capable of draining 1/8" of water per 24 hour <br /> period (Q.005 in/hr). The proposed conditions have been modeled without a <br /> draintile ou�et and with the 6" draintile that was installed to replace the existing <br /> draintile line. Both the existing and proposed conditions have an assumed <br /> starting elevation of 995.95, the elevation of the installed 6" draintile line. The low <br /> area emergency overflow(EOF) is located along Watertown Road and <br /> discharges to the south. The assumed EOF is at elevat�on 1003.0.Assumed <br /> elevation is from 2011 Hennepin County Lidar information. <br /> Existing Conditions <br /> Low Area with Draintile Outlet Assumed Oufiflow Rate of 0.005 inmr <br /> 10-YR HWL = 999.49 <br /> 100-YR HWL = 100'E.24 <br /> 10-YR Discharge = 0.00 cFs <br /> 100-YR Discharge =0.00 cFs <br /> Low Area without Drainfile Outlet <br /> 10-YR HWL = 999.49 <br /> Stormwater Management Calculations <br />