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City of Mounds View Page 14 <br />Ardan Avenue Drainage Subdistrict Analysis 000435-07129-0 <br />4.10 LOW POINT ON SUNNYSIDE ROAD,NORTH OF ARDAN AVENUE <br />Existing Flood Protection Characteristics: <br />ƒOverland area to street low point (Node 33) = 6.4 acres <br />ƒSurveyed critical flow path elevation (circled in blue above) = 908.17 feet <br />ƒSurveyed lowest opening elevation = 908.95 feet (8280 Sunnyside Road Garage Floor) <br />ƒFlood protection between critical flow path and lowest opening elevations = 0.78 feet <br />ƒExisting downstream conveyance restriction = 24” storm sewer, downstream of Node 33B <br />Proposed Improvements to Increase Flood Protection: <br />ƒAbandon 18” storm sewer between Nodes 22 and 24, 30A and 31, 33C and 33B <br />Tributary area to Node 33B is reduced from 99.9 to 28.8 acres <br />2-year runoff rate from Node 33B is reduced from 51 to 15 cfs