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Manage new .development and drainage alternations. by requiring each development of land disturbing <br />activity to manage its storrnwater effectively, either on or off -site; <br />.Promote and encourage a reduction in runoff rates, encourage infiltration and promote groundwater <br />recharge. <br />L) Maximize groundwater -recharge as a means.of rrtaintaiining drinking water supplies;.. erving base flows. in <br />streams, and limiting. discharges of stormwater to downstream receiving waters. <br />3]� Assure 'that property .owners. control the rate and volume of stormwatel'. runoff originating from .then <br />Property so. that. surface water. and groundwater quantity. grid quality is protected or improved, soil erosion .is <br />minixnized,.and flooding potential is reduced.: <br />F Pzotect`and unprove natural resources within the watershed:to:.prevent further degradation. <br />22:2.2 Regulation <br />4:Rate Control. The proposed activity will not <br />pre-developmentconditioirs, for anything less.tl <br />or. 2-, `10- and 100-years. The applicant must:eon <br />Construction Activities. <br />Volume Control. Storm -water runoff valume 164 <br />the,runoff generated frorn one,half..inch of runoff <br />specified under Section 8.0. Volu e?controi.credits <br />as described. under. Section :22:2.5. <br />f.Water Quality <br />for Construction,. <br />trianagement plan <br />allowed. <br />ease the peak staxmwater riuiaff rate from the site, under <br />24-hour precipitation event with a return fxequenry of 1- <br />with the xequiremeriCs. of the. MPCA's General Permit for <br />J. be achieved or site in the amount equivalent to <br />impervious surfaces``of the development or as <br />sed to control up to one -Half (0.5) inch of runoff <br />with tlierequixements.of the.MPCA's.GeneralVermit: <br />ital. ma:�cirzium daily load studies and sustainable. lake <br />starrnwater to natural or. improved waterbodies.:are <br />Waste Dis osaly'to.Waters;Stomnwater management must not result in. the .discharge of. any regulated <br />14 P <br />:. <br />substance;;;: haxazdous or;;:liialogical •waste, or petroleum .product; .whether treated or untreated,to best <br />and <br />irazx``'erient"iactcc devices:; that may'%ae,.a deleterious effect upon water of .the state (surface a <br />ag P . <br /><groundWater),uniess` the discharge is in cotnpliarice with Federal; State and local regulations. <br />22.2:3 GriteriaT Stortnrvatcr xt5anagement plains; shall cornply with the .following criteria: <br />A� 11 iiydrogzaph method Teased .on: sound hydrologic .theory will be used to analyze runoff for the design or <br />analysis of floQvs. and water, levels, <br />B� Runoff. rates far; til e: p tapased activities,. development or redevelogriient within the watershed'shall.: <br />1j Not exceed existing runoff rates for the 1 or 2-year, 107year. and 100-year critical duration storm <br />events; <br />4.Not accelerate on or off -.site water course erosion, downstream nuisance, flooding or damage as. <br />demonstrated by the applicant, and <br />Runoff rates may be restricted to less than the existing rates when necessaryfor the protection of <br />may <br />public health, safety and general welfare. <br />C j, Stormwater facilities must provide: <br />1..An identified overflow spillway and downstream route sufficiently stabilized to convey a 104-year <br />critical storm event; <br />Updated March 14. 2017 Gem.Lake Consolidated Land. Use grdinance — Page 131. <br />