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habitat , areas designated by the county biological survey , greenways , parks and open <br /> space , groundwater recharge areas , wellhead or surface water protection areas or <br /> regional stormwater pond locations . <br /> ( c ) Conveyance system . Wherever possible untreated and treated stormwater <br /> runoff shall be conveyed in facilities open to the atmosphere ( e . g . swales , vegetated <br /> buffer strips , energy - dissipating structures , and the like ) rather than through enclosed <br /> pipes , so as to decrease runoff velocity , allow for natural infiltration , allow suspended <br /> sediment particles to settle , and to remove pollutants . <br /> ( d ) Proposed development design shall: <br /> 1 . Maintain or decrease runoff volume , where practicable as determined by <br /> the City Engineer ; <br /> 2 . Decrease erosion and sedimentation , <br /> 3 . Maintain or decrease flow frequency , duration , and peak runoff rates ; <br /> 4 . Increase infiltration ( groundwater recharge ) or filtration ; <br /> 5 . Maintain existing flow patterns ; <br /> 6 . Reduce time to peak flows by increasing the time of concentration to and <br /> through storm sewers ; <br /> 7 . Provide storage of stormwater runoff on site ; <br /> 8 . Avoid channel erosion ; <br /> 9 . The proposed project must not adversely affect water level off the site <br /> during or after construction ; and <br /> 10 . The proposed activity may not reduce hydraulic efficiency of the drainage <br /> ways at any point up - gradient of the applicant ' s parcel boundary . <br /> a-8-: 11 . A combination of Stormwater BMPs may be used to meet the <br /> requirements of section ( s ) 6 , 7 , or 8 <br /> ( e ) Landlocked basins . A landlocked basin may be provided an outlet only if it : <br /> 1 . Retains a hydrologic regime that complies with the requirements of the <br /> local governmental unit ( LGU ) responsible for administration of the Wetland <br /> Conservation Act (WCA ) ; <br /> 2 . Provides sufficient dead storage volume to retain back to back 100 -year , <br /> 24 - hour rainfalls and runoff ; and <br /> 3 . Does not create adverse downstream flooding or water quality conditions <br /> as a result of increased discharge rate or volume , or other factors . <br /> ( f) All plans shall be consistent with National Pollutant Discharge Elimination <br /> permit ( NPDES ) requirements , the Lino Lakes engineering design standards , the Lino <br /> Lakes stormwater design standards , and the filing or approval requirements of Rice <br /> Creek Watershed District , Vadnais Lakes Watershed Management Organization , Anoka <br /> County , Minnesota Department of Natural Resources , Minnesota Department of <br /> 17 <br />