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City of Mounds View Page 11 <br />Ardan Avenue Drainage Subdistrict Analysis 000435-07129-0 <br />4.7 LOW POINT ON FAIRCHILD AVENUE,NORTH OF ARDAN AVENUE <br />Existing Flood Protection Characteristics: <br />ƒOverland area to street low point (Node 26) = 2.2 acres <br />ƒSurveyed critical flow path elevation (circled in blue below) = 907.73 feet <br />ƒSurveyed lowest opening elevation = approximately 908.0 based on 2-foot contours <br />ƒFlood protection between critical flow path and lowest opening elevations = 0.27 feet (estimated) <br />ƒExisting downstream conveyance restriction = 24” storm sewer, downstream of Node 26 <br />Proposed Improvements to Increase Flood Protection: <br />ƒAbandon 18” storm sewer between Nodes 22 and 24 <br />Tributary area to Node 26 is reduced from 35.1 to 15.8 acres <br />2-year runoff rate from Node 26 is reduced from 21 to 11 cfs