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l� • • <br /> ` Planning • Engineering • Surveying ,1451ab <br /> Lance r <br /> 174,6 ve - a Garb <br /> January 17, 2006 <br /> Lrn r1f'> 0A 4417 <br /> a <br /> ` f <br /> n <br /> �a �k� �I- <br /> Mr. Allen Munson <br /> 3165 North Shore Drive Ai cc error c.. <br /> Wayzata, MN 55391 <br /> Subject: Drainage Study <br /> Dear Mr. Munson: <br /> Please find enclosed our Drainage Study Analysis for the Munson residence at 3165 <br /> North Shore Drive, Wayzata, MN. Runoff calculations were made for both existing and <br /> proposed conditions to identify the change in drainage due to new construction. Our <br /> analysis indicates the existing drainage pattern is through the northeast neighbor's lot <br /> and around the south side of the Munson residence down to Lake Minnetonka. (Refer <br /> to attached drainage area maps) The proposed grading and landscape changes direct <br /> a majority of the drainage runoff to the southern side of the residence down to the lake <br /> and reduces the drainage on the northeast neighbor's lot. Our calculations are <br /> tabulated below: Area A represents drainage that remains on the Munson's site. Area <br /> B represents drainage to the northeast neighbor's property. The analysis indicates the <br /> proposed site improvements reduce the off-site runoff across the neighbor's property <br /> and the total runoff rate is increased slightly. Below is a chart, from our calculations, <br /> representing the difference in discharge from areas A and B. <br /> Runoff Conditions to selected Discharge Location <br /> Existing Proposed Total Runoff <br /> Design Conditions Conditions Inc./Decrease <br /> Area A, Area B, Area A, Area B, Area A, Area B, <br /> Storms cfs cfs cfs cfs cfs cfs <br /> 2 yr 0.457 0.647 0.652 0.473 0.195 -0.174 <br /> 10yr 0.948 1.340 1.350 0.980 0.402 -0.360 <br /> 100yr 1.371 1.940 1.950 1.418 0.579 -0.522 <br /> U:\MISC\3165Nshoredrive.doc <br /> 10580 Wayzata Boulevard, Suite 1 • Minneapolis, MN 55305-1525 <br /> Office (952) 546-7601 • Fax(952) 546-9065 <br /> www.schoellmadson.com <br />