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City Council to receive update on stormwater infrastructure projects

A construction crew installs a check valve on East Mason Street in November (via City of Alexandria)

City staff laid out what’s ahead for some of the city’s stormwater infrastructure projects in a presentation prepared for the City Council’s meeting tonight (Tuesday).

Three large projects to increase sewer capacity are planned in Del Ray, according to the Flood Action Alexandria presentation. Two of the projects — a $34 million undertaking at East Glebe Road and Commonwealth Avenue and a $16 million project at Ashby Street and East Glebe Road — were merged together for planning purposes. The two projects are next to each other in the Four Mile Run watershed.

“This project is expected to increase the capacity, or size, of the stormwater sewer pipes; create opportunities for stormwater to be stored and released slowly over time; and incorporate ‘green infrastructure’ practices, such as permeable pavement, that allow the stormwater to soak into the ground, reducing runoff,” the city website states.

The contract for work in the Four Mile Run watershed is estimated to be awarded sometime this spring, with the project targeted for completion in 2025.

Another, called the Hooff’s Run Culvert/Timber Branch Bypass, is at the southern end of Del Ray. The $60 million project will construct a new stormwater pipe system to transport stormwater away from the Hooff’s Run Culvert, helping manage flows from the Timber Branch watershed, the city website states. The city plans to put out a request for qualifications for that project this spring.

Between fiscal years 2023 and 2032, the city proposes to fund $156 million in large capacity projects, $55 million in maintenance, $44 million in spot improvements and $18 million in water quality projects, according to the presentation.

The presentation lists two spot improvement projects in the design phase and another two in construction phase. Spot improvements are small capital projects meant to address localized flooding and draining issues relating to the city’s storm sewer system.

Cul-de-sac inlets and drainage are being designed for the Mount Vernon Avenue cul-de-sac near Blue Park. At Oakland Terrace in Rosemont, the city is in the design phase to stabilize degrading and eroding banks and protect sanitary sewer line.

The city is also increasing inlet capacity at Hume Avenue in the Potomac Yard area, and not far away at Clifford Avenue, and Fulton and Manning streets. The latter work started at the end of February.

Vernon Miles contributed to this article. Photo via City of Alexandria.

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