Commonwealth, Ashby, Glebe Flood Mitigation Project
The Commonwealth, Ashby, Glebe Flood Mitigation Project combined the top two large capacity projects will provide flood relief for the neighborhood near the intersections of Commonwealth Avenue and East Glebe Road, and Ashby Street and East Glebe Road. The proposed design includes new parallel relief sewers along Commonwealth Avenue and East Glebe Road, which will increase the capacity of the storm sewer system. Additionally, a new outfall will be installed to discharge flows to Four Mile Run. Finally, green infrastructure practices will be implemented to provide a water quality benefit to the watershed.
• Status: In design
• Total Estimated Cost: $50,000,000
• Funding Source: Stormwater Utility, Community Flood Preparedness Fund (CFPF) grant
Check the status of the City's flood mitigation projects using this interactive map tool.
The City of Alexandria has experienced repeated and increasingly frequent flooding caused by climate change-induced storms near the intersections of Commonwealth Avenue near East Glebe Road, and East Glebe Road near Ashby Street. These increased flooding occurrences corroborate findings from the City of Alexandria’s Storm Sewer Capacity Analysis (CASSCA, 2016), which shows storm sewer networks along Commonwealth Avenue and East Glebe Road within the project area do not have adequate capacity to convey runoff from the intense storm events experienced in recent years. This increased flooding is attributed to old infrastructure, design criteria at the time of construction and climate change.