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City of Mounds View Page 16 <br />Ardan Avenue Drainage Subdistrict Analysis 000435-07129-0 <br />4.12 LOW POINT ON GREENWOOD DRIVE,NORTH OF ARDAN AVENUE <br />Existing Flood Protection Characteristics: <br />ƒOverland area to low point (Node 39) = 4.9 acres <br />ƒSurveyed critical flow path elevation (circled in blue above) = 908.90 feet <br />ƒSurveyed lowest opening elevation = 910.07 feet (8320 Greenwood Drive Garage Floor) <br />ƒFlood protection between critical flow path and lowest opening elevations = 1.17 feet <br />ƒExisting downstream conveyance restriction = 36” storm sewer, downstream of Node 39A <br />Proposed Improvements to Increase Flood Protection: <br />ƒAbandon 18” and 15” storm sewer between Nodes 22 and 24, 30A and 31, 33C and 33B , 36A and 38 <br />Tributary area to Node 39A is reduced from 128.6 to 47.5 acres <br />2-year runoff rate from Node 39A is reduced from 65 to 22 cfs