Pervasive alteration of flow in US streams and rivers
Published On: 11/8/2010
A new USGS national assessment finds that nearly 90% of US streams and rivers have altered flow.
The study identified over 1,000 unimpaired streams to use as reference points to create stream flow models. The models were applied to estimate expected flows for 2,888 additional streams where the USGS had flow monitoring gauges from 1980-2007. The estimated values for the 2,888 streams were compared to actual, measured flows to determine the degree to which streams have been altered.
This study was conducted by the USGS National Water-Quality Assessment Program, which has assessed the physical, chemical and biological characteristics of streams and rivers across the nation since 1991.Water-quality data from more than 1,300 locations, much of it in real-time, are available through USGS Water Quality Watch. Instant, customized updates about water conditions also are available by subscribing to WaterAlert.
Click here to read the USGS press release.
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