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MINNEHAHA CREEK I QUALITY OF WATER � WATERSHED DISTRICT QUALITY OF LIFE • Currently, 2 filtration ponds are proposed within the wetland buffer o If BMPs are proposed within the wetland buffer, than the buffer area must be increased to make up for the area lost from the BMP. This may cause unwanted site constraints. o Filtration is given a 50% credit for abstrection, ie treat for the first 2" of rainfall. The abstraction credit schedule can be found on pages 12-13 of the stormwater rule. • High Water Elevation o All applications shall provide at least two vertical feet of seoaretion between low openings of structures and the 100-year high water elevations of stormwater BMPs and waterbodies. o NOD does not reference, but it appears the preserve wetland is a DNR public waters wetland that connects to Lake Minnetonka. The 100 year floodplain elevation for Lake Minnetonka is 931.5' • The below table summarizes the allowable impact to downstream waterbodies based on management class. The large wetland complex has been identified as a preserve and the small wetland to the SE does not have a management class on file. Wetland Permitted Inundation Inundation Runout Control Management Bounce for 1-, Period for 1-Year Period for 10- Class/ 10-, and 300- Event and 300-Year Elevation YearEvent Event Waterbody Preserve Existing Existing Existing No change Manage 1 Existing plus 0.5 Existing plus 1 Existing plus 2 No change feet day days Manage 2 Existing plus 1.0 Existing plus 2 Existing plus 14 0 to 1.0 ft above feet days days existingrunout Manage 3 No limit Existing plus 7 Existing plus 21 0 to 4.0 ft above days days existing runout Lakes Existing N/A N/A No change Wetland Protection: • W15-17 Boundary & Type NOD valid • No proposed wetland impacts # 3 9 03 E�EC��/�� JAN 1 8 2(J'I r CITY OF ORONO