. Bulletin. Science. MORENA RESERVOIR » \ UNITED STATES v MEXICO. RODRIGUEZ' RESERVOIR Dams -4 Net Littoral Current »» Fig. 1. Tijuana River Watershed. Imperial Beach in San Diego County in 1959. The beach was re-opened in 1962 after Tijuana built another sewage system, but closed again in 1965 after the system repeatedly failed. To aid the situation, an emergency pipeline was con- structed to carry up to 13 million gallons of sewage a day to the Point Loma Sewage Treatment Plant in San Diego. By 1980 this pipeline was at full capacity from population pressures on both sides of the border. Thi
. Bulletin. Science. MORENA RESERVOIR » \ UNITED STATES v MEXICO. RODRIGUEZ' RESERVOIR Dams -4 Net Littoral Current »» Fig. 1. Tijuana River Watershed. Imperial Beach in San Diego County in 1959. The beach was re-opened in 1962 after Tijuana built another sewage system, but closed again in 1965 after the system repeatedly failed. To aid the situation, an emergency pipeline was con- structed to carry up to 13 million gallons of sewage a day to the Point Loma Sewage Treatment Plant in San Diego. By 1980 this pipeline was at full capacity from population pressures on both sides of the border. This arrangement is now renewed on a year-to-year basis. Yet, the combination of breaks in the Tijuana sewage plant and incessant dumping of raw sewage continue to pollute the river and the Pacific Ocean where it empties. In response, the International Boundary Water Commission (IBWC) was formed by the Mex- ican and governments to monitor the effects of 32 to 38 million gallons of sewage discharged each day (Boesch 1990). Tijuana River Estuary The Tijuana River and its tributaries drain a series of marine terraces and cross the border just north of Tijuana where it combines with water from the Pacific Ocean and exits at the Tijuana Estuary. The combination of these waters, the change in topography, and the consequence of tidal flow and streamflow provide a diverse habitat for a variety of birds plants, animals, fish, insects and organisms. The estuary is part of the Pacific Flyway and hosts thousands of waterfowl and shorebirds during winter migration. Several water-associated birds that are rare or endangered are often sighted there (Zedler et al. 1992).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Southern California Academy of Sciences. Los Angeles, Calif. : The Academy
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