Upper Weadley Stormwater Improvement Projects

The objectives of the Upper Weadly Stormwater Improvement Projects are to address flooding within the Trout Creek watershed of Tredyffrin Township located in Chester County, Pennsylvania. The 70-acre watershed contains a suburban development consisting mostly of 1/2-acre resident lots. The watershed was developed prior to modern stormwater management requirements. As a result, the stormwater management infrastructure in place is undersized and in poor condition. The watershed suffers from chronic flooding that is a threat to the quality of life for the residents.

Princeton Hydro developed a hydrologic model of the entire 70-acre watershed and its existing stormwater system, which was used to find critical points in the existing stormwater system that are triggering localized flooding events. The model was built from both survey data collected in the field and as-builts provided by the Township. Princeton Hydro also was tasked with finding opportunities to use grey and green infrastructure to minimize flooding events. The size of the identified and proposed infrastructure was determined by the hydrologic model.

The Township officials and Princeton Hydro held two public meetings to engage residents of the neighborhood. The purpose of the first meeting was to introduce the project to the residents and gather information about localized flooding. The residents shared stories and information from flooding events they had witnessed over the years. The second meeting was to share the proposed improvements for the neighborhood and to garner support from the residents for the proposed changes.

The project is still in the design phase and is scheduled to go out to bid in September 2024.