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City of Orono <br />Surface Water Management Plan February 2019 37 <br />south side of the park and drains south to Lake Minnetonka without any treatment. The <br />tile is undersized for the drainage area and in poor condition. The stormwater drainage <br />model predicts that even during smaller rain events, flooding occurs in the park with <br />runoff overtopping the road, which agrees with local observation. In order to provide <br />water quality, volume reduction, and storage capacity improvement, a bioretention <br />basin should be considered for this location. The retrofit basin would treat stormwater <br />runoff from a previously untreated area of Orono, improving the quality of runoff <br />reaching Lake Minnetonka, and ultimately Minnehaha Creek. In addition, flooding <br />potential would be minimized due to increased storage capacity and volume reduction. <br />Outlet control structure improvements should be considered in this location, as well, to <br />provide adequate runoff rate control and limit flooding potential. As such, this project <br />should be coordinated with Section 5.3. <br />Prioritization:High <br />Estimated Cost: $54,945.00 <br />Project Partner(s): MCWD <br />Funding Source(s): City, MCWD, Grant funding <br />Timeframe: Unknown <br />CB-2. South Casco Point Road <br />Runoff draining down the street in the neighborhood of 3040 Casco Point Road <br />currently drains through a number of inlets to a 12” CMP to Lake Minnetonka without <br />any treatment. Due to the lack of inlet and conveyance capacity, flooding is observed <br />during larger rain events. In order to provide water quality improvement and limit <br />flood potential, a sump manhole with flow baffle, new inlets, and storm sewer <br />improvements should be considered for this location. The retrofit sump manhole <br />would provide stormwater runoff treatment from a previously untreated area of Orono, <br />improving the quality of runoff reaching Lake Minnetonka, and ultimately Minnehaha <br />Creek. In addition, flooding potential would be minimized due to increased conveyance <br />capacity. <br />Prioritization: High <br />Estimated Cost: $35,653.75 <br />Project Partner(s): MCWD <br />Funding Source(s): City, MCWD, Grant funding <br />Timeframe: Unknown <br />CB-3. Casco Cove <br />Runoff draining down Casco Point Road in the neighborhood of 2900 Casco Point <br />Road drains east to a low area in the backyards between Casco Point Road, Casco <br />Avenue, and Casco Cove. Runoff then discharges through a 12” RCP across Casco <br />Cove to Lake Minnetonka without any treatment. The area around the backyard <br />depression is located in tree canopy and somewhat denuded of vegetation. The outlet is <br />undersized for the drainage area and in poor condition. The stormwater drainage model <br />predicts that even during smaller rain events, flooding occurs in the backyards with <br />runoff overtopping the road, which agrees with local observation. In order to provide <br />water quality, volume reduction, and storage capacity improvement, a bioretention <br />basin and storm sewer improvements should be considered for this location. The <br />retrofit basin would treat stormwater runoff from a previously untreated area of Orono, <br />improving the quality of runoff reaching Lake Minnetonka, and ultimately Minnehaha <br />Creek. In addition, flooding potential would be minimized due to improved conveyance <br />infrastructure, increased storage capacity, and volume reduction. Outlet control <br />structure improvements should be considered in this location, as well, to provide <br />adequate runoff rate control and limit flooding potential. As such, this project should