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Howarc R. Green Corr <br />CONSULTING ENGINEERS <br />MEMORANDUM <br />Ogg.% <br />pany <br />iISk <br />S <br />Formerly MSA <br />Consulting Engineers <br />To: <br />From: <br />Subject: <br />Mr. Terry J. Maurer, P.E., Howard R. Green Company <br />Mr. David E. Nyberg, P.E., Howard R. Green Company <br />MAPLE LEAF COURT DRAINAGE ISSUE <br />CANADA WOODS WEST DEVELOPMENT <br />PROPOSED COST SHARE PROPOSAL <br />File: 804490J -0325 <br />Date: October 21, 1998 <br />,(/,gPaC rp au ep-n4lh'Jvco,$j. <br />»/h ar'o v%epp•��eajA-. <br />Syj a / / ?/oJeof - J /4-+L /O� /7t- r/v./ <br />eth in- C/t,� 4-e eanf7'n4td4'r" G8d <br />As requested by the City of Little Canada at the meeting on October 14, 1998, we have <br />completed a cost -share proposal for the Enkamat/riprap swale option. <br />Introduction <br />Several options were explored to control the erosion along the back property lines of the homes <br />along Maple Leaf Court. After some discussion between representatives from Little Canada, <br />Vadnais Heights, and Ramsey County, a consensus was reached to proceed with the option of <br />constructing an Enkamat/riprap swale. This swale would extend from the convergence of the <br />culverts at the north end of Maple Leaf Court and then along the back property lines of the <br />affected lots on the east side of Maple Leaf Court. <br />The swale along the north end of the flow path, for approximately 100 feet, would consist of <br />excavating a shallow swale and lining it with Enkamat erosion control blanket to minimize <br />additional erosion. At the south end of the drainage path, where the erosion is more severe and <br />a deep gully has formed, a uniform channel will be excavated, graded, and lined with riprap. <br />In addition to the Enkamat/riprap swale, the curb and gutter along the east side of Maple Leaf <br />Court will be extended around the radius with County Road D and then eastward along County <br />Road D. This curb and gutter extension will redirect the overflow from the catch basin on the <br />north side of County Road D. The overflow would then flow south over County Road D and into <br />the gutter section and then south along Maple Leaf Court to the catch basin at the south end of <br />the cul-de -sac. <br />With the overflow routed along the existing curb on Maple Leaf Court, the flow that would have <br />flowed into the swale on the south side of County Road D is eliminated, thus reducing the flow <br />into the problem area. <br />0NPROJ1804490i \0325 \490- 2104.oct.doc <br />Page 134 <br />1326 Energy Park Drive • St. Paul, MN 544 -9446 toll free 888/368 -4389 <br />