2019.02.04 ORD 2019-493 Stormwater Management Rules

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ORDINANCE 2019-493 AN ORDINANCE OF THE CITY OF HUGO ADOPTING CERTAIN RULES OF THE RICE CREEK WATERSHED DISTRICT REGARDING STORM WATER MANAGEMENT. The City Council of the City of Hugo, Washington County, Minnesota, does hereby ordain as follows: WHEREAS, the City of Hugo is responsible for local water resource management and desires to adopt by reference Rice Creek Watershed District's Rules regarding storm water management (Rule C), erosion and sediment control (Rule D) flood plain alteration (Rule E) and wetland alteration (Rule F) and any revisions or amendments thereto by the Rice Creek Watershed District. NOW THEREFORE, it is ordained as follows: Section 1. The following rules of the Rice Creek Watershed District and any amendments or revisions thereto are adopted as ordinances of the City of Hugo: Rule: Rule C "Stormwater Management Plans" (a) The City of Hugo adopts by reference the Rice Creek Watershed District Rule C regarding Stormwater Management Plans. The rules and regulations related to the review of Stormwater management plans will be reviewed by the Local Governing Unit (LGU) in accordance with the Rice Creek Watershed District Rule The Rice Creek Watershed District retains authority for C.5(f) and the City will covey drainage system easements to the Rice Creek Watershed District as required by C.10 (b). (b) Additions. The following regulations are additions to Rule C because they are more restrictive than the Rice Creek Watershed District Rules. (1) Rate Control. The City requires applicable new and redevelopment sites to limit the 100-year 24-hour rainfall event discharge rate to less than 0.1 cfs/acre. Atlas 14 rainfall data must be used to calculate this value. (2) Freeboard. Any new development or redevelopment within the City will maintain 3 feet of freeboard between the 100-year high water elevation (HWL) or 10-day snowmelt event, whichever is greater, of the nearest stormwater BMP or natural waterbody and the minimum building opening. If this 3-foot freeboard requirement is considered a hardship, the standard could be lowered to two feet if the below conditions can be met: a. Provide flood storage volume within the freeboard area that is at least 50% of the flood storage volume below the 100-yr HWL; and b. 25% outlet obstruction does not increase the 100-yr HWL by more than 1'; and c. Adequate emergency overflow (EOF) from basin to provide assurance that 1' freeboard will be maintained for proposed low opening