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General Criteria <br />The following general criteria should be used when designing the sediment pond. <br />• For basins intended to have permanent water levels, a minimum of 4 feet of standing water <br />(dead storage depth). <br />• Maximize the separation between inlet points and outlets to prevent short-circuiting of storm <br />flows. <br />• A 10:1 slope for the first 15 feet from shore, then 4:1 maximum slope. <br />Floatable Pollutants <br />D. the establishment of design criteria. for stormwater outlet structures to address floatable <br />pollutants and to provide for access for maintenance and repair; <br />During the project review, the WMO may determine that a pond skimming device would be required. <br />Pond skimming devices should be designed to remove oils and floatable materials up to a 1-year <br />frequency event. The skimmer should be set 6 inches below the normal surface water elevation and <br />should control the discharge velocity to 0.5 fps. <br />Nutrient Trapping Pond Design <br />E. pond design methodology for nutrient entrapment consistent with the subwatershed <br />goals; and <br />See Pond Construction <br />Pollutant Loadings for Watersheds <br />F. compliance with pollutant loading for specific subwatersheds consistent with local, <br />regional, and statewide plans in consideration of Pollution Control Agency water <br />quality standards. <br />At this time there are no target loads for watersheds in the WMO. <br />The LRRWMO will work with the Anoka Conservation District in addressing the impairment of the <br />Mississippi River from the northwest city limits of Anoka to the Rum River and the Anoka <br />Conservation District and the Upper Rum River WMO in addressing the impairment of Rogers Lake. <br />Water Management Plan <br />P:\Mpls\23 MN\02\2302047\WorkFiles\3rd Gen WMP\LRRWMO 3rd Gen WMP July 2009Draft.doc <br />83 <br />