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Ground Water Replenishment with Reclaimed Water in the City of Los Angeles

1998; Wiley; Volume: 18; Issue: 2 Linguagem: Inglês

10.1111/j.1745-6592.1998.tb00626.x

1745-6592

Ali Karimi, Jeremy A. Redman, Roberto F. Ruiz,

Water Systems and Optimization

Abstract A two‐year pilot study involving the recharge of a ground water basin with reclaimed water was completed in the city of Los Angeles. The city's Department of Water and Power is planning to initiate several ground water recharge projects using reclaimed water in the near future. One such project is the Headworks Recharge Project, the focus of this paper, Approximately 1 cfs of the Los Angeles (LA) River water comprised of 70% tertiary treated reclaimed water was recharged on a two‐day wet and five‐day dry cycle. The recharge water was then extracted from the basin approximately 1000 feet downgradient. Results showed greater than 4‐log removal of coliform bacteria, up to 87% reduction in TOC, and compliance of the product water with federal and state drinking water standards. Model simulation showed after 15 years of recharging 3000 acre‐feet per year of the LA River water and extracting about 10,000 acre‐feet from the basin, the product water would contain from 5% to 15% reclaimed water. This is well below the maximum allowable limit of 20% stipulated by the California regulation.