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<br />C <br /> <br /> <br />'1Jfr~ ~/,I District <br />V~~~ <br />(J)o~~ <br /> <br />Watershed District <br /> <br /> <br />Ramsey-Washington Metro <br /> <br />Technical Criteria for Rules-June 29, 2005 <br /> <br />Rate Control <br /> <br />Rule Objective <br />Protect and maintain downstream drainage systems to provide permanent and safe conveyance of <br />stormwater. Reduce the frequency andlor duration of potential downstream flooding. <br /> <br />Tcchnical Criteria <br />Peak discharge rates for development and redevelopment must be at or below existing rates for the 2, 10, and <br />100 year storm events. <br /> <br />Rule Threshold <br />CRWD - All development and redevelopment I acre or greater. <br />RWMWD - All development and redevelopment I acre or greater within the Beltline Snbwatershed. <br /> <br />Volume Control <br /> <br />Rule Objective <br />Reduce the total volume of storm water to protect surface water quality and provide recharge to groundwater. <br /> <br />Technical Criteria <br />Developments and redevelopments must reduce runoff volumes in the amount equivalent to an inch of runoff <br />from the impervious areas of the site. <br /> <br />CRWD - Stormwater must be pretreated before discharging in infiltration areas to maintain the long.term <br />viability of the infiltration area. <br />RWMWD - Pretreatment must be provided for subsurface infiltration devices only. Pretreatment not <br />required on surface infiltration devices but will need to meet performance standard. <br /> <br />Rule Threshold <br />All development and redevelopment I acre or greater. <br />