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. • • --.r • . <br />■■ * • a <br />result in a displacement upward of the'^round surface and <br />... - - . . . . .. • ‘ <br />adjoining marsh areas. Construction of a bem along ' <br />the east side of Kelly Avenue could also increase the marsh <br />storage capacity» but this is also considered impractical <br />due to the existing soil conditions. <br />Under Alternate No. 1, the conveying of excess runoff <br />out of the marsh area through the use of storm sewer, two <br />possible routes have been considered. These rc tes are <br />identified as Route A and Route B and are shown on the er- <br />closed drawing. Route A indicates the conveying of water <br />across County Road No. 19, eventually to the large marsh <br />behind the Fresh Water Biological Institute. Route B studies <br />the conveying of excess runoff along Kelly Avenue to Lydiard <br />Avenue and thence to Carmen Cove. All systems utilize a 10 <br />year design recurrence interval. The use of Root-fi A iiivolves <br />the conveying of storm water from one drainage b^.sin to <br />another. It involves not only the City of Orono, but the <br />City of Minnetonka Beach as well, since the outlet from the <br />marsh behind the Fresh Water Biological Institute to Lake <br />Minnetonka is in the City of Minnetonka Beach. Route B, <br />although not following the nat\iral drainage way, conveys the <br />excess storm water to its present \iltimate discharge area. <br />Two alternatives under each routing have been considered. <br />Under Route A, Alternate 1# a gravity storm sewer system <br />would be constructed. Under Route A, Alternate 2, a combina­ <br />tion of force main and gravity storm sewer would be constructed.• •• • <br />• • -•< <br />- i