Washington Street West watershed - City of Champaign

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Draft ReportWest Washington Street Watershed Master PlanGOAL A:Identify stormwater runoff problemareas within the West WashingtonStreet watershed.Description:Based on input from the community, historical data, visual observation, and contributions fromthe City of Champaign the intersection of West Washington Street and North Russell Street hasbeen identified as one of the City’s key flooding problem areas. Visual inspection of the area,examination of contours, and analysis of the storm sewer network reveal that the WestWashington Street storm sewer is the primary drainage outlet for the area. As there no longerexists a primary overland flood route due to the watershed being completely developed, the Cityrelies entirely on its sewer system to convey stormwater runoff. When the storm sewer system isfully surcharged, stormwater runoff ponds on the surface and finds an overland flow path alongthe Washington Street corridor through yards in residential areas towards the Copper Slough.For the purposes of this report, the West Washington Street corridor will be defined by the areaenclosed by the red box in Figure 2-3. The limits of this area were determined by the input fromthe City and local residents, as well as from the XP-SWMM computer model results. This areadoes not represent all the problem areas or even contains the entire extent of flooding at theintersection of West Washington Street and North Russell Street, but does show where the root ofmany of the watershed issues is located. Any proposed improvements located within theWashington Street corridor will have an impact on the entire watershed since this area containsthe West Washington Street trunk sewer through the residential areas and the junction of the WestWashington Street trunk sewer and the other trunk sewers in the sewer network.September 20092-5Clark Dietz, Inc.
Draft ReportWest Washington Street Watershed Master PlanFigure 2-3West Washington Street Corridor MapThe analysis of the West Washington Street corridor includes an examination of the otherproblem areas (within the West Washington Street watershed) to develop a more completeunderstanding of the areas prone to flooding and what is needed to improve the flooding situationin the West Washington Street watershed. The low area northeast of the intersection of NorthMattis Avenue and Glenn Park Drive is an area of concern when upstream stormwater runoffcauses surface flow along the West Washington Street corridor and local slopes divert flowtowards this low area. During precipitation events where surface flow north of West WashingtonStreet occurs, the natural tendency is for the stormwater runoff to follow the defined overlandflow path shown in Figure 2-4. This results in surface flow on and north of West WashingtonStreet, that ponds and flows through yards west towards North Draper Avenue and North GarfieldAvenue where the flow is detained in the low area.September 20092-6Clark Dietz, Inc.
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Washington Street West watershed - City of Champaign

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