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Colma Creek project in South San Francisco diverts, treats and reuses millions of gallons for park irrigation and recharge
Summary
Engineers described Orange Memorial Park as a first‑of‑its‑kind regional stormwater capture project that stores stormwater in a cistern (≈230,000 gal) for reuse, directs overflow to a 1.6M‑gal infiltration gallery for groundwater recharge, and produces an estimated 15M gal/year of non‑potable reuse; ongoing O&M and permitting remain central implementation issues.
Rob Dusenberry of Lotus Water presented the Orange Memorial Park regional stormwater capture project, sponsored by the city of South San Francisco, as an example of a multi‑benefit approach that combines water quality treatment, reuse and groundwater recharge.
Dusenberry said the project diverts runoff from Colma Creek into a pretreatment structure (trash and grit chamber), then into a cistern with about 230,000 gallons of storage that can supply roughly three days of irrigation demand. When the cistern is full, water overflows into an infiltration gallery with about 1.6 million gallons of capacity for groundwater recharge. Treated water is also pumped into a water‑treatment building for final disinfection and irrigation use;…
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