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Airr5Ell <br /> 3535 VADNAIS CENTER DRIVE,200 SEH CENTER,Si PAUL,MN 55110 612 490-2000 800 325-2055 <br /> ARCHITECTURE • ENGINEERING • ENVIRONMENTAL • TRANSPORTATION <br /> October 28, 1994 RE: Mounds View, Minnesota <br /> Hydrologic Review of Sherwood Estates <br /> SEH No. A-MOUND9402.00 <br /> Mr. Jon K. Wilczek, P.E. <br /> Comstock & Davis, Inc. <br /> 1446 County Road J <br /> Minneapolis, MN 55112 <br /> Dear Jon: <br /> Based on our discussions after the Monday, October 24, 1994 Council meeting, I have <br /> summarized below the items that need to be completed and sent to us for review. This <br /> information will be required prior to final Council action on the Sherwood Estates Plat. <br /> The items required are: <br /> - Map(s) showing the drainage boundaries of the watershed for areas inside and <br /> outside the plat for existing and proposed conditions. <br /> - Runoff volume calculations using SCS methodology for the existing drainage area <br /> (assume CN=63 or use your own value with an explanation why it differs) for the <br /> 100-year, 24-hour storm and the 10-day runoff event. <br /> - Runoff volume calculations using SCS methodology for all proposed drainage <br /> areas outside the plat (use same CN used for existing conditions) and within the <br /> plat for the 100-year, 24-hour storm and the 10-day runoff event. <br /> - Ponding elevation(s) and overflow locations and elevations for existing and <br /> proposed ponding areas. <br /> Final outlet elevation of the pond next to Highway 10 based on the MnDOT <br /> culverts. <br /> - Hydraulic calculations of the storm sewer to indicate how the 10-year storm will <br /> be conveyed from Sherwood Place even if the Highway 10 pond is at the <br /> elevation of the outlet culvert located in the MnDOT right-of-way. <br /> Calculations for the 10-year and 100-year existing flow rates to the Highway 10 <br /> system (with drainage map). <br /> SHORT ELLIOTT <br /> HENDRICKSON INC- MINNEAPOLIS.MN ST CLOUD,MN CHIPPEWA FALLS,WI MADISON, WI <br />