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7.2.1 RUNOFF RATE <br />Goal: Control the rate of surface water runoff from development to reduce downstream flooding and <br />erosion. <br />Policy 1: Adopt RCWD Rule C by reference. Develop Comprehensive Stormwater Management Plans <br />(CSMP) for required stormwater management as an alternative to meeting the requirements <br />of RCWD Rule C, Sections 6 and 7. The RCWD is required to approve any CSMP. Review and <br />update City code as necessary to reflect this policy. <br />Policy 2: Peak runoff rates from regulated new development, redevelopment, or site expansion projects <br />shall not exceed existing rates for the 2-year, 10-year, and 100-year rainfall events. Rate <br />control below existing rates may be necessary where downstream capacity issues are <br />identified, which will require coordination with the RCWD and adjacent municipalities. <br />Policy 3: Coordinate with RCWD to ensure stormwater practices are implemented to prevent increases <br />in peak runoff rates at RCWD-designated intercommunity flow locations. Intercommunity flow <br />locations are shown with arrows at the City boundary on Map 1. Specific intercommunity flow <br />rates identified in the RCWD District -wide model are tabulated below. <br />Peak Flow <br />(cfs) <br />Discharging <br />Receiving <br />Watercourse <br />2-Year, 24- <br />10-Year, 24- <br />100-Year, 24- <br />100-Year, 10- <br />city <br />city <br />Hour Rainfall <br />Hour Rainfall <br />Hour Rainfall <br />Day Snowmelt <br />Mounds View <br />New <br />Brighton <br />Rice Creek <br />222 <br />444 <br />832 <br />1331 <br />ARJD 1 Main <br />Mounds View <br />Shoreview <br />Trunk <br />21 <br />58 <br />213 <br />143 <br />Policy 4: Require that the maximum duration for rainfall critical event analysis shall be 24 hours. <br />Require the use of the hydrograph method of analysis and NOAA Atlas 14 rainfall amounts <br />and distribution. <br />Policy 5: For new construction, ensure that stormwater features have emergency overflow spillways <br />sufficiently sized and stabilized to convey flows greater than the 100-year critical storm event. <br />7.2.2 FLOOD PREVENTION AND FLOODPLAIN MANAGEMENT <br />Goal: Provide adequate storage and conveyance of runoff and control development in flood prone areas <br />to protect the public safety and minimize property damage. <br />Policy 6: Adopt RCWD Rule E by reference. Review and update City code as necessary to reflect this <br />policy. <br />City of Mounds View 38 <br />Local Surface Water Management Plan Stantec Project No. 193804166 <br />(5 5tantec <br />