The Philadelphia Water Department decided to invest in green infrastructure to collect and treat stormwater runoff at the source, through a variety of sustainable urban drainage systems that reduce the amount of stormwater entering the combined sewer system. Primarily developed to reduce volume and pollution in rivers, the ambitious 25-year programme is likely to produce social, economic and environmental benefits too, supporting urban regeneration and creating a green legacy for future generations.
Our experts prepared final design plans and specifications for several projects including stormwater curb extensions, infiltration trenches that water trees with stored stormwater, and planters that collect drainage from the street. We modelled these and other stormwater management practices, resolved construction process issues that occur when working in a dense urban environment, and helped to optimise the designs to improve durability and maintenance.