Watershed Scale Application and Evaluation of Green Infrastructure for CSO Control L'application et l'évaluation des infrastructures vertes à l'échelle du bassin hydrographique pour le contrôle des rejets urbains de temps de pluie

To reduce combined sewer overflows, New York City is underway with efforts to implement green infrastructure source controls throughout combined sewer areas. A comprehensive pilot program serves as a foundational component of these efforts, providing valuable information on implementation logistics and performance. Building upon efforts piloting individual source controls, the New York City Department of Environmental Protection is piloting implementation of green infrastructure within three localized watersheds, ranging in size from 4 to 10 hectares. In addition to on-site controls, more than 70 right-of-way bioswales were distributed across the three pilot areas. These watershed pilots are expected to provide key lessons on the opportunities and challenges of applying green infrastructure at a watershed scale, while also providing valuable information regarding the aggregate effect of these individual controls on sewer flows through consolidated flow monitoring.