11-20-2006 Council Agenda - Laserfiche WebLink

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x. Bankfull discharge rate (1.5 year recurrence interval) of' creek or stream if there is a waterway on the site or if the site discharges directly to the waterway. xi. Locations of all stormwater management practices, infiltration areas, and areas not to be disturbed during construction xii. Steep slopes where areas of 12% or more existing over a distance for 50 feet or more. xiii. Location of temporary sedimentation basins - If more than 10 acres are disturbed and drained to a single point of discharge temporary sediment basins must be installed, however, if the site has sensitive features as determined by the City or the potential of off site impacts, then temporary sediment basins must be installed to protect the resource. This is determined on a site by site basis. When site restrictions do not allow for a temporary sediment basin, equivalent measures such as smaller basins, check dams, and vegetated buffer strips can be included. xiv. Location and engineered designs for structural stormwater management practices including stormwater treatment devices that remove oil and floatable material (e.g., basin outlets with submerged entrances). xv. Normal water level, high water level, and emergency overflow elevations for the site. xvi. For discharges to cold water fisheries, a description and plans to control temperature from stormwater runoff. xvii. Floodway and flood fringe boundary, if available. (I, All proposed stormwater practices, hydrologic models, and design methodologies shall be reviewed byCiiv and certified for compliance by the C liy.inaccordance with their plans and specifications. B. Stormwater Management Performance Standards and Design Criteria The applicant shall consider reducing the need for stormwater management performance standards by incorporating the use of natural topography and land cover such as 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 receiving waterbody. The development shall minimize impact to significant natural features. Review the site for steep slopes (greater than 12 %), wetlands, wooded areas of significance, rare and endangered species habitat, areas designated by the County Biological Survey, metro greenways, or County parks and open space. These areas should not be developed. The development shall limit impervious surface coverage. Impervious surface coverage of a site shall not exceed that allowed by City Ordinance ,,Proposed design, suggested location and phased implementation of effective, Model Stormwater Ordinance Page 5 NEMO Ordinance Project 9 1 Deleted: community 3 tDeleted: community Deleted: community Deleted: twenty five percent (25 %) of the site area unless stormwater is conveyed to an approved, on -site or regional stormwater pondinglretention facility designed to accommodate the increased ntnoffprior to discharge from the site into public waters or wetlands Deleted: In designated shoreland areas the development shall meet the impervious surface requirements of the Shoreland Ordinance regardless of t. conveyance systems.