City-Wide Stormwater Management Plan » Donohue & Associates, Inc. Client: City of Waukesha Location: Waukesha, Wisconsin Donohue completed an XP-SWMM 2D model for the City of Waukesha as part of a Stormwater Management Plan. Prior to this project, large storms caused unacceptable levels of stormwater flooding in the City. To determine “unacceptable stormwater ponding,” the project team evaluated two rainfall events. Protection requirements to be met during the 24-hour, 6-inch rainfall or the 3.8-inch rainfall events are: No basement or first floor storm water flooding from either ponded water or wave action, defined as a water level on the street that is one foot lower than the lowest potential water entry point in a building No unacceptable overland flooding on private property from sto

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