This article outlines the California Department of Transportation’s (Caltrans’) unique filtering system used in the 12 sq. mi. area of watershed from freeways, park-and-ride lots, and maintenance stations that drains into the Los Angeles River. This filtration system was precipitated by the Los Angeles Regional Water Quality Control Board’s reduction of Total Maximum Daily Load (TMDL) of trash entering the river to be zero on any particular day. Two of Caltrans’ prototype systems, known as the gross solids removal devices (GSRD), were developed in tandem - the Linear Radial Device, and the Inclined-Screen Device, Type 1. The systems, which Caltrans officials plan on building at more than 2,6000 sites, which were originally developed by the Water Programs department at California State University Sacramento, were also tested by hydraulics engineers at University of California, Davis, in order to increase their efficiency. These filters were particularly difficult for consultants to design, as Caltrans, in order to create both economically viable and effective design, required that they only require routine inspection to supplement the yearly emptying of debris along with a 50 year life-span.


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Filing Info

  • Accession Number: 01006991
  • Record Type: Publication
  • Source Agency: UC Berkeley Transportation Library
  • Files: BTRIS, TRIS
  • Created Date: Nov 8 2005 7:34AM