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2008-02-26_PWETC_AgendaPacket
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2008-02-26_PWETC_AgendaPacket
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Public Works Commission
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Agenda/Packet
Commission/Committee - Meeting Date
2/26/2008
Commission/Committee - Meeting Type
Regular
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313 We have also reopened discussions with Midland hills Golf Course about their <br />314 participation in a neighborhood wide project. <br />315 <br />316 Recorzz~nended 2008 actio~~: <br />317 Staff has identified a number of potential ways to address runoff through storm water <br />318 Best Management Practices {BMPs}. BMP's are tools that can be used to address water <br />319 quantity and quality. Like any tool, they should only be used where they will be <br />320 effective. Factors that can impact the success of these tools are; soils, topography, and <br />321 property owner support. Tlu°ee different BMPs that could be used to address the storm <br />322 water in this subwatershed, are; <br />323 <br />324 .Rain Garden: A rain garden is a relatively small area of plantings near the drain spout <br />325 of a building or a paved area. Rainwater is routed to the garden where it is used by the <br />326 plants and infiltrates naturally into the soil of the garden. <br />327 Biofiltration Basin: A bioretention basin is similar to a rain garden in that it is a <br />328 relatively small area of plantings near the drain spout of a building or a paved area. <br />329 However, these are constructed in areas where the soils are heavy clay and water does <br />330 not infiltrate into the ground quickly. Rainwater is routed to the garden and filtered <br />331 naturally by plants, but there is an overflow to the storm sewer system. <br />332 Infiltration trench: An infiltration trench is located underground. Tlus shallow <br />333 excavation is filled with porous material to create an underground reservoir for storm <br />334 water runoff. The runoff gradually percolates through the bottom and the sides of the <br />335 trench into the surrounding subsoil over a period of days. <br />33b <br />337 We see this improvement as being in keeping with the City of Roseville's commitment to <br />338 help the environment. This project would retrofit this residential area with BMPs that <br />339 would reduce the volume of rua~off, while treating pollutants at the source. <br />340 <br />341 We propose to work with individual residents on identifying locations for these BMPs. <br />342 These facilitics will be primarily designed to capture street runoff through the installation <br />343 of curb cuts at each location or be located in backyards where they can be the zx~ost <br />344 effective. <br />345 <br />346 In order to better understand the number and size of BMPs needed to address the <br />347 problem, staff would like to retain a consultant to develop an XP-SWMM model. The <br />34$ XP-SWMM analysis will enable us to evaluate the performance of the system. The <br />349 model predicts the elevation of flooding within rear yards, low areas and intersections in <br />350 this neighborhood. <br />351 <br />352 Once the project particulars have all been fnalized, we will bring this project to the City <br />353 Council for review and approval. It is anticipated that these improvements would be <br />354 funded using Storm water Utility funds. <br />355 <br />City of Roseville <br />2aa7 Storm Water Annual Report Page 9 of 15 <br />
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