2018-01-24 CC Packet - Laserfiche WebLink

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Stantec CITY OF CENTERVILLE -2018 LOCAL WATER PLAN WATER RESOURCE MANAGEMENT PLAN small area in the northwestern portion of the City drains directly to Lino Lakes. The Rice Creek Watershed District identifies the intercommunity flows from Centerville to Lino Lakes, via Clearwater Creek (Anoka-Washington Judicial Ditch 3) as: • 2-year, 24-hour rainfall peak flow: 196 cfs • 10-year, 24-hour rainfall peak flow: 339 cfs • 100-year, 24-hour rainfall peak flow: 573 cfs • 100-year, 10-day snowmelt peak flow: 433 cfs Because of the large storage volume available in the two lakes, peak flows entering from the City will be greatly attenuated prior to discharge from Peltier Lake. As stated earlier in this chapter, the City requires that peak flow rates from the 2-, 10-, and 100-year storm events be maintained at or below existing conditions. The RCWD rules require the infiltration and/or retention of the runoff volume as described in Section 6.1. The combination of these factors leads to a net reduction below existing conditions for discharge leaving the City and entering Lino Lakes. 6.8 EROSION AND SEDIMENT CONTROL Recognizing that erosion and sediment control can best be administered on a local level, the Centerville City Council discussed methods and policies that can be implemented to control erosion from new construction sites. In the past, this responsibility was delegated almost fully to the Rice Creek Watershed District. However, due to the number of construction projects the RCWD administers during a given construction season, it is difficult for the watershed district to inspect these projects. The erosion and sediment control criteria for new developments that resulted from these discussions with the City have been consolidated into an Erosion and Sediment Control Policy for New Developments. The policy adopts the procedures and recommendations of the Minnesota Pollution Control Agency's Protecting Water Quality in Urban Areas: Best Management Practices for Minnesota. City Code Chapter 157 addressing Erosion Control is provided in the appendix. To prevent soil erosion into surface water systems, RCWD requires a District permit where soil disturbance or removal of vegetative cover affects one acre or more of land, or where soil disturbance/removal exceeds 10,000 square feet or more of land if the disturbed area is greater than 300 feet or more. Erosion and sediment control plans must: 1) address erosion and sediment issues during and after project completion, 2) be consistent with the MPCA's document"Protecting Water Quality in Urban Areas," 3) minimize the removal of vegetation, and 4) must protect facilities used for post-construction stormwater infiltration. The RCWD has encouraged the City to participate in the District's Water Quality BMP Cost-Share Program. This is a dedicated cost-share grant program to assist property owners with the implementation of Best Management Practices (BMPs) aimed at improving the quality of surface waters within the 6.24 62