Design Spec: Extended Detention Pond, 2011

Developed by the Virginia Department of Conservation and Recreation, this design specification (Version 1.9, 2011) provides guidance on designing extended detention pond systems that temporarily store stormwater and release it at controlled rates to reduce peak flows and improve water quality through sedimentation and extended settling time. It helps designers size detention storage, configure outlet control structures, and incorporate pretreatment and maintenance considerations to support long-term stormwater performance.