2018-02-28 CC Packet - Laserfiche WebLink

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(' Stantuc CITY OFCENTERV|LLE -2D1QLOCAL WATER PLAN WATER RESOURCE MANAGEMENT PLAN TABLE Q.1 -TPREMOVAL FACTORS FOR PROPERLY DESIGNED ByNPa Infiltration Infiltration Feature 1.00 Water Reuse Irrigation 1.00 Biofiltration Underdrain 0.65 Filtration Sand or Rock Filter 0.50 Stormwater Shallow Wetland 0.40 Wetlands Pond/Wetland 0.55 Stormwater Wet Pond 0.50 Ponds Multiple Ponds 0.60 Infiltration may be infeasible, due to potential contamination (i.e. contaminated soils or potential otormvvaterhob;poto\. physical limitations /i.e. low permeability soils, bedrock close tothe infiltration area, seasonal high water tables, or karst areas), or land use limitations /i.e. nearby vve||o or utility locations). In these oaoeo. alternative BMPo are required, as listed inTable 0.1 These BMPo are stated in order of RCVVD'o preferenoe, due toTP removal efficiencies. The RCWD requires protective easements for all stormwater detention facilities and conveyance structures. These easements are intended to protect floodplain and otormvvaterotonage areas from alterations that may interfere with storage and/or flow ofsurface water, particularly during flood conditions. They also serve as formal notice to the property owners and future property owners that the land within the easements may be inundated atany future date. Maintenance of stormwater facilities will be coordinated with the RCWD. Currently, inspections are performed in the spring and fall, with maintenance done as needed. Maintenance of the current system will continue to be a priority for the City. As new development occurs, developers will "turn over" these new otornnvvatertsoi|ideo to the City Public Works Departnnent, including trunk and lateral storm sewers, catch basins, stormwater BMPs, and ponds and outlet structures. With such a relatively new storm sewer system, there are currently few maintenance tasks other than street sweeping, which is done a minimum of twice per year. However, the City plans to formulate a Maintenance Plan Budget within five years. As an MS4 oih/. Centerville is ultimately responsible for the monitoring and maintenance of water bodies and other best management practices or structural stormwater conveyance oyotenno as defined in its NPDEE) permit. It shall be oih/ policy that the City is directly responsibility for the monitoring and maintenance of elements of the City's MS4 system when those elements take drainage from public property or the public right-of-way. Where elements of the oib/'o MS4oyotem are constructed on, and take drainage from, solely private propertv, oih/ policy shall bethat the private property owner is responsible for monitoring and maintenance of 0.21