The lower reach, which extends 5 12 miles upstream from Best Management Practices Drastically Reduce Sediment and Restore Water Quality in Las Vegas
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The lower reach, which extends 5 12 miles upstream from Best Management Practices Drastically Reduce Sediment and Restore Water Quality in Las Vegas
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Problem
During the past 30 years, the Las Vegas area of
southern Nevada experienced dramatic popula- tion increases. Indeed, the 1,600-square-mile metropolitan Las Vegas Valley is one of the fastest growing areas in the United States. The valley drains into Las Vegas Wash, which car- ries stormwater runoff and wastewater 12 miles to Las Vegas Bay, an arm of Lake Mead.Rising population and development rates have
increased the volume of water discharged into the wash. An increase in impervious surfaces allows more stormwater runoff to flow directly into the wash rather than be absorbed by the soil. In addition, the growing population produces a high volume of wastewater that is discharged into the wash. The increased water flow, when added to an area already prone to flash flooding, accelerated erosion in the wash, destabilized the stream channel, significantly degraded wetland areas, and contributed excessive sediment to Las Vegas Bay.For state water quality management purposes,
Nevada divides the wash downstream of the
city of Las Vegas into two reaches. The lower reach, which extends 5.12 miles upstream from Best Management Practices Drastically Reduce Sediment and Restore Water Quality in Las Vegas WashSection 319NONPOINT SOURCE PROGRAM SUCCESS STORY
The Las Vegas Wash drains the 1,600-square-mile Las Vegas Valley, delivering stormwater, urban runoff, and highly treated effluent to Lake Mead, the nation's largest manmade reservoir and the primary water sup- ply for millions of people in Nevada, Arizona, and southern California. These sources caused water quality impairments to the lower wash due to excess sediment and iron transported withthat sediment. In 2002, Nevada placed the lower reach of Las Vegas Wash on its 303(d) list of impaired waters, with impairments to aquatic life propagation (excluding fish) due to total
suspended solids (TSS). Following the construction of erosion control structures, restoration of wetland areas, and removal of invasive vegetation, average TSS concentrations declined signifi- cantly. This allowed the state to remove the lower reach from its 303(d) list in 2004.