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Developing a Bacteria TMDL in Engineered Channels: The Los Angeles River, A Case Study

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Abstract:

Many rivers in the US are channelized to control stormwater runoff and reduce the impacts of major flood events in the region. The characteristics of channelized rivers may vary from a completely concrete-box or trapezoidal channel to those with "soft-bottom" streambeds. These complex yet structurally simplified channels suffer from the problems of altered habitats and degraded water quality resulting from point and non-point discharges, homeless populations, and other factors. Despite limited public access, these channels are subject to water quality regulations.

The Los Angeles River (LAR) that flows through Los Angeles County, California, is one of such engineered channels with a number of water quality impairments. The LAR and its tributaries are on the US EPA 303(d) list as impaired for recreational beneficial uses due to fecal coliform bacteria. Several publicly-owned treatment plants (POTWs) discharge to the LAR; what is notable is at these locations, the LAR attains bacteria standards. The focus of this paper is on the development of the LAR Bacteria TMDL in the context of stakeholder participation and planning to revitalize the river through increased habitat, recreation and development, against the reality of a river that is officially off-limits to public access.

Keywords: BACTERIA; ENGINEERED CHANNELS; LOS ANGELES RIVER; TMDL

Document Type: Research Article

DOI: http://dx.doi.org/10.2175/193864707787452679

Publication date: October 13, 2007

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  • Proceedings of the Water Environment Federation is an archive of papers published in the proceedings of the annual Water Environment Federation® Technical Exhibition and Conference (WEFTEC® ) and specialty conferences held since the year 2000. These proceedings are not peer reviewed.

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