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rfv <br />'M' <br />•r <br />I <br />f' <br />Li <br />result in a displacement upward of the ground surface and <br />Jbhe adjoining <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 routes are <br />identified as Route A and Route B and are shown on the en~ <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 Hater 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 ' i..volves <br />the conveying of storm water from one drainage i^.A.'iin to <br />another. Zt involves not only the City of Orono, but the <br />e <br />City of Minnetonka Beach as well, since the outlet from the <br />sh behind the Fresh Water Biological Institute to Lake <br />Minnetonka is in the City of Minnetonka Beach. Route B, <br />although not following the natural drainage way, conveys the <br />excess storm %#ater to its present ultimate 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.