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City of Mounds View Page 5 <br />Ardan Avenue Drainage Subdistrict Analysis 000435-07129-0 <br />4.1 LOW POINT SOUTH OF SHERWOOD ROAD AND FAIRCHILD AVENUE INTERSECTION <br />Existing Flood Protection Characteristics: <br />ƒOverland area to street low point (Nodes 3 and 4) = 8.2 acres <br />ƒSurveyed critical flow path elevation (circled in blue above) = 910.65 feet <br />ƒSurveyed lowest opening elevation = 913.18 feet (8085 Fairchild Avenue Garage Floor) <br />ƒFlood protection between critical flow path and lowest opening elevations = 2.53 feet <br />ƒExisting downstream conveyance restriction = 18” storm sewer, between Nodes 16 to 33A <br />Proposed Improvements to Increase Flood Protection: <br />ƒAbandon 15” storm sewer between Nodes 13A and 16 <br />Tributary area to the downstream 18” storm sewer is reduced from 30.3 to 15.8 acres <br />2-year runoff rate to the downstream 18” storm sewer is reduced from 17 to 9 cfs