Laserfiche WebLink
<br />. . <br /> <br />Flooding <br /> <br />C. the establishment of standards to reduce the impacts offlooding on natural resources <br />and personal and real property; <br /> <br />Since flooding problems are local in nature the municipal stormwater management plans have <br />addressed how best to solve such problems. If the problem involves intercommunity flow the WMO <br />is the appropriate agency to discuss an equitable solution to the problem. Listed below are <br />recommended standards for facility design that communities can use as a guide when they prepare <br />their local plans. <br /> <br />Hydrology Major Facilities (i.e., Detention Ponds) <br />To provide consistent hydrologic information within the member cities, standards have been <br />established to guide existing and future hydrologic and hydraulic calculations. All future engineering <br />work done in the member cities requires that the data will be submitted to the member cities based on <br />the standards outlined in the local water management plan. <br /> <br />Land Use Assumptions <br />Land use shall assume ultimate development with the entire area tributary to the pond/waterbody. <br /> <br />Storm Distributions-See Land & Water Resources Inventory <br /> <br />Rainfall-See Land and Water Resources Inventory <br /> <br />Hydrology-Minor Facilities (i.e., Storm Sewer, Ditches, Culverts) <br />City Projects <br />To calculate peak flow rates for the design of minor systems, methods currently approved by the <br />municipalities and the WMO include: USDA SCS; TR-55; & TR-20, HydroCAD, and EPA SWMM <br />methodology. <br /> <br />The minor drainage system shall be analyzed and designed using a IO-year frequency rainfall, and <br />shall be evaluated for the 100-year frequency rainfall unless otherwise determined by the <br />municipalities. <br /> <br />County or State Projects <br />Culvert crossings or storm sewer system in County or State right-of-way may have a design <br />frequency which differs from the IO-year. Each agency shall be contacted to determine the <br />appropriate design frequency. <br /> <br />Water Management Plan <br />P:\Mpls\23 MN\02\2302047\WorkFiles\3rd Gen WMP\LRRWMO_3rd Gen WMP _July 2009_Draft.doc <br /> <br />79 <br />