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Section.22.2 Stormwater.Managernent; <br />2221.Policy Statement. It is the policy of the City -to. <br />A) Manage new development and drainage alternations by requiring each development or land disturbing <br />activity to mariage:its storrnwatet effectively, either on or off -site: <br />B) Promote and encourage a reduction in runoff rates, encourage .infiltration and promote groundwater <br />recharge. <br />C) Ma_ximi2e.groundwater recharge as a means of:xnaintaining drinking. water supplies, preserving base flows in <br />streams, and limiting discharges of stormwater to downstream receiving waters. <br />D) Assure that property owners control the rate. and volume: of stormwater .runoff originating from their <br />property. so that surface water and .groundwater quantity, and quality is: protected. or improved; soil erosion is <br />minimized, and flooding potential is reduced. <br />R) Protect and improve natural resources within the watershed to prevent further degradation. <br />22.2.2 Regulation <br />A) Rate Control. The proposed activity will not increase the peak stormw. ater runoff rate from the site, under <br />pre -development conditions; for anything less than. a. 24-hour precipitation event with. a :return frequency of 1:-: <br />oz_2r .1 fl- and 1 .q3��„ears7n--,gplicant. must co ply. with the re q . emertts Of #}ie_ G 's%- cneraEP.ermit for <br />. ;w•,tyr.,, _ .'z•.:•:c�=fir. wr, c t� ;�� <br />=�';Fi:_i".2f ::ts.:y -F .•�-`:�'=�.'.�".-,"�=5 �-='%.Yzs ir:•i{:`�;s;'.-.,�.X <br />C50 f cuon A tivtttes. ._ ,. <br />B) Voluu e Co ."al. 5tormwateJ7--offrxvolu reten- n shall b s ieved onsite in the amoi''T t equivalent to <br />the rt�n `ffgeri ecl''fiom°:oahalf inch off tY the. im .„eryxous;; "urfaces of the .development ar as <br />;under eatl n`8 ;V 1_;; 5:- <br />p v d' o trine contr l �iiits,canzbe used: eontrvl up to one-half 0 zncla of runoff <br />s....:.. ) <br />as descril'ed: un • er�5ection 2�:2:5: �`-:;� <br />:;:.stet u ;= tormwater mahaemt must comply vith thel'e"quirements of the.MPCA &General Permit. <br />for Construction Activities and guidelines set .foxth in total maximum daily load. studies. and sustainable lake <br />management plans. No direct (untreated) discharges of: storrawatex. to natural or improved waterbodies ate <br />allowed. <br />D) : Waste Disposal to Waters -. Stormwater management must not result in: the discharge of..any regulated. <br />substance, hazardous or biological waste; or petroleum product, whether treated or untreated, .to best <br />management practice devices that may have a deleterious effect upon water of . the state (surface. and <br />groundwater), unless the :discharge is in compliance: with Federal, State and local regulations. <br />22.2.3 Criteria. Stormwater management plans shall comply with: the following criteria: <br />A). A hydrograph method based. on sound hydrologic theory will be used. to analyze runoff for the design or <br />analysis of flows and water levels.. <br />B) .Runoff rates for the -proposed activities, development or redevelopment within the watershed shall: <br />1) Not exceed existing.runoff rates for the 1 or 2-year, 10-year and 100-year critical duration. storm <br />euents; <br />2) Not accelerate on or off -site. water courseerosion, downstream. nuisance, flooding or damage .as <br />demonstrated by the. applicant; and. <br />3). Runoff rates may be restricted to less than the existing rates. when necessary for the protection .of <br />public health; safety and .general welfare. <br />Updated June 5, 2017 Gern.Lake Consolidated Land Use Ordinance —Page 113 <br />