Client:
District Department of Transportation (DDOT)

Project Description:
The District Department of Transportation (DDOT) Broad Branch and Spring Valley Stormwater Retrofit project is being designed to install cost-effective stormwater green infrastructure (GI) to improve water quality in the District’s waterways and provide other benefits like traffic calming, reduction in urban heat island effect, and the addition of green space. This is a retrofit project to meet District Municipal Separated Sewer System (MS4) permit requirements mandated by the EPA. This permit requires the District to conduct a variety of pollution-reduction activities including implementation of stormwater best management practices (BMPs).  The goal of the project is also to reduce the erosion and/or pollution in the affected tributaries. The recommended green infrastructure designs include planter, curb extension and open area bioretention; permeable pavement in parking lanes, sidewalks, and alleys; impervious surface removal; tree plantings, impervious surface removal and other volume reduction and water quality enhancements.