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Falls Church planning to buy 0.5 MGD capacity from Fairfax, council briefed on peak‑flow risks and $10M detention option
Summary
City staff presented a draft agreement to buy an additional 0.5 million gallons per day of sewer capacity from Fairfax County and described new hourly peak and daily volume limits in the draft that would require corrective action or infrastructure if repeatedly exceeded.
City staff presented a draft capacity purchase and related mitigation plan Monday to address long‑standing inflow‑and‑infiltration (I&I) and peak‑flow issues in sewers that convey Falls Church flows through Fairfax County to the Alexandria Renew (AlexRenew) treatment plant.
The draft agreement would increase Falls Church’s annual average daily allocation to about 1.5 million gallons per day (MGD) by purchasing an additional 0.5 MGD from Fairfax County. Staff said the draft purchase price is roughly $8.8 million (figures in the staff presentation indicated a purchase price in that range) and that availability fees collected from developers so far have been used to fund earlier conveyance upgrades and the capacity purchase.
Fairfax County inserted additional protections into the draft terms that are new to the city’s agreement: specific limits on hourly conveyance peak flows and a maximum total daily volume that, if exceeded with particular frequency, would trigger corrective requirements. Staff said the draft sets thresholds…
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