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CATCHMENT PROFILE: RL-13 <br />Rice Lake Subwatershed Assessment <br />Catchment Summary <br />Acres <br />249 <br />Dominant Land Cover <br />Residential, '/4-'/2 acre lots <br />Parcels <br />455 <br />TSS Ib/ r <br />39,066 <br />TP Ib/ r <br />123.8 <br />Volume acre-feet/ r <br />105.0 <br />Description: <br />RL-13 is located on the south side of Rice <br />Lake. The catchment area contains several <br />developments of single family homes. <br />Stormwater management in the catchment <br />area is comprised of a complex network of <br />catch basins, pipes, ditches and ponds. <br />Retrofit Recommendation: <br />Three retrofit possibilities exist in this area <br />1. Curb -cut rain gardens: The best option for <br />treating stormwater in the residential <br />neighborhoods is with curb -cut rain gardens. <br />Positioning the rain gardens uphill from the <br />catch basins will capture stormwater runoff <br />before it enters ponds, and may improve the <br />ponds' ability to treat stormwater by increasing <br />the residency time. <br />Rta RL-2 <br />R .3 <br />RL-4 <br />RL-8 <br />RL8 <br />R-T <br />Rice Lake <br />RL� <br />RL-11 <br />RL_12 <br />-_ BIRCH ST <br />I <br />O <br />z <br />N0 RL 13 <br />4 <br />1 A 0 <br />z <br />2. Shenandoah Park: Treatment of ditch water running through the park can be <br />accomplished by creating a stormwater wetland facility in the unused portion of the <br />park. Flows from the ditch greater than base conditions could be diverted to the facility <br />and treated. In addition, the facility could improve the aesthetics of the park and <br />provide educational opportunities to the public and students at nearby Rice Lake <br />Elementary. See page 37 for more project details. <br />3. Pond Modifications: Another retrofit opportunity involves modifying the elevations of <br />the inlets/outlets of the ponds in the catchment area to provide additional treatment at a <br />low cost. They could also be assessed for maintenance that could provide additional <br />storage volume. Due to the interconnectivity of the system and the risk of upland <br />flooding, pond modifications should be assessed by an engineer. <br />-38- <br />