PL PACKET 11171998 - Laserfiche WebLink

Home Browse Search

(a) An applicant shall install or construct, on or for the proposed land disturbing or development activity,all storm water management facilities necessary to manage increased runoff so that the two year,ten 12 year, and 100 year storm peak discharge rates existing before the proposed development shall not be increased and.accelerated channel 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 of community storm water management facilities designed to serve multiple land disturbing and development activities undertaken by one or more persons, including the applicant. (b) The applicant shall give consideration to reducing the need for storm water management facilities by incorporating the use of natural topography and land cover such as wetlands,ponds,natural swales and depressions as they exist before development to the degree that they can accommodate the additional flow 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 stonn wateL managernent plan in the following descending order of preference: (1) Natural infiltration of precipitation on-site; (2) Flow attenuation by use of open vegetated swales and natural depressing; (3) Storm water retention facilities; and (4) Storm water detention facilities. (d) A combination of successive practices may be used to achieve the applicable minimum control requirements specified in subsection a)above a of this subdivision. Justification shall be provided by the applicant for the method selected. Subd. 8. Design standards. Storm water detention facilities constructed in the City of 2knthoriy shall be designed according to the most current technology'as reflected in the MPCA publication"Protecting Water Quality in Urban Areas", and shall contain,at a minimum,the following design factors: (a) A permanent pond surface area equal to two Vereeat Vlo of the impervious area draining to the pond or orrepereent 11/6 of the entire area draining to the pond, whichever amount is greater; -11-.