Washington Street West watershed - City of Champaign

Draft ReportWest Washington Street Watershed Master PlanJust north of the intersection of North Mattis Avenue and Glenn Park Drive is another area that isa natural low spot that gathers stormwater surface runoff resulting in nuisance flooding shown inFigure 4-4 as the red area. Flooding in this area originates from the surface flow along the WestWashington Street corridor and the West Washington Street storm sewer surcharging. Surfacestormwater flow along the West Washington Street corridor, eventually flows to the low pointjust east of North Mattis Avenue. Surface inlets and ground slopes direct a portion of this flowback to the West Washington Street trunk storm sewer, while the remainder of the standing runoffis infiltrated. This configuration produces standing water that may take an extended period oftime to recede, acting as an unofficial detention basin for the West Washington Street watershed.The current storm sewer system and ground slopes prohibit adequate drainage of this area.Figure 4-4Surface Flooding at North Mattis Avenue and Glenn Park DriveThe 1200 Block of West University Avenue, North James Street, West Columbia Avenue, NorthDraper Avenue and many other problem areas shown in Figure 2-2 occur along or upstream ofthe West Washington Street trunk sewer. Other issues that exist in the West Washington StreetSeptember 20094-4Clark Dietz, Inc.