40th and Butler Avenue Drainage Improvements

The hybrid ditch consists of a perforated HDPE pipe in a stone envelope to allow storage of runoff in the void space and a positive outlet for water reaching the perforated pipe. Since a majority of the runoff will infiltrate through the grassed swales, water quality will increase by reducing the amount of sediment transported in the storm flows. The proposed drainage system will also diminish the peak flow rate seen by the existing downstream infrastructure. Additionally, mechanically stabilized stone and/or pervious pavers are being analyzed by our utility engineering consultants as potential solutions for the parking areas to allow for the infiltration of stormwater, further reducing the possibility for standing water in the street as well as area flooding.