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City of Mounds View Page 8 <br />Ardan Avenue Drainage Subdistrict Analysis 000435-07129-0 <br />4.4 LOW POINT NORTH OF SHERWOOD ROAD AND EASTWOOD ROAD INTERSECTION <br />Existing Flood Protection Characteristics: <br />ƒOverland area to street low point (Nodes 12 and 13) = 5.5 acres <br />ƒSurveyed critical flow path elevation (circled in blue above) = 907.49 feet <br />ƒSurveyed lowest opening elevation = 910.65 feet (8111 Eastwood Road Egress Window) <br />ƒFlood protection between critical flow path and lowest opening elevations = 3.16 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 <br />ƒConstruct a new 18” storm sewer, north on Eastwood Road between Nodes 13 and 36A <br />Storm sewer conveyance capacity from Sherwood Road to the proposed trunk storm sewer in <br />Ardan Avenue is increased from 5 to 13 cfs