3.0. SR 04-24-1993 - Laserfiche WebLink

Home Browse Search

. 774-6021 MRIER STEWRRT RSSOC. 124 P17 RPR 21' 93 15: 18 seven clays, and the slonndrain inlets must be protected with straw bale or other appropriate filtering barriers.. Storm water mana,ement criteria for permanent facilities. a) An applicant shall ins'tall or construct, on or (or the proposed land disturbing or development activity, all storm water management facilities necessary to manage increased ruooa so that the twQ.year, ten.year, and tOO-year Slonn peak discharge rates existing before the proposed development shan not be increased and accelerated cbannel erosion will not occur as a result of the proposed land disturbing or development activity. An applicant may also make an in-kind or monetary contribution to the development and maintenance oC community storm water management (acilities designed to serve multiple land disturbing and development activities undertaken by one or more persons, including the applicanL 8.7 b) The applicant shall give consideration to redudng the need Cor slorm water management facilities by incorporating the use or Datural topography and land cover such as wetlands. ponds, natural swales and depressions as they e.~ist berore development to the degree that they can accommodate the additional now of water without compromising the integrity or quality of the wetland or pond. c) The following storm water management practices shall be investigated in developing a storm water management plan in the following descending order of preference: . 1) Infiltration oC runoff on-site. if suitable soil conditions are available for use; 2) Flow attenuation by use of open vegetated swales and natural depressions; 3) Storm water retention facilities; and 4) Storm water detention facilities. A combination of successive practices may be used to achieve tbe applicable minimum control requirements specified in subsection <a> above. Justification shall be provided by the applicant for the method selected. 8.8 Desirn standards. StOnD water detention (aenities constructed in tho [City, Town, County] of' shall be designed accardin, to the mast current tcchDology .. rcOected ID the MPCA publieatioD .Protecting Water Quality in Urban Areas-, aDd shan contaia, at . minimum, the following design factors: . d) a) A permanent pond surface area equal to two perceDt of the impervious area draining to the pond or ODe pera:Dt of the entire area d~iDg to the pond, whichever amount is greater; b) An average pennanent pool depth or Cout to ten feet; [COMMENTARY:.An iZlterruuive to subsections (a) tlnd (b) would be 10 require that the volllrM 01 the pemulntnt pool be equ.al to or gretJter than 1M IU/UJD from 0 20.inch rainfall for the fully developed site.} c) d) A permanent poollength-to-width ratio of 3:1 or greater; A minimum protect.ive shelf extending ten feet into the permanent pool wilh a slope of 10:1. beyond which slopes should not exceed 3:1;