The U.S. Geological Survey, in cooperation with Gwinnett County Department of Water Resources, established a Long-Term Trend Monitoring (LTTM) program in 1996. The LTTM program is a comprehensive, long-term, water-quantity and water-quality monitoring
Joiner, John K. jkjoiner@usgs.gov,Aulenbach, Brent T. btaulenb@usgs.gov,Landers, Mark N. landers@usgs.gov. Watershed characteristics and water-quality trends and loads in 12 watersheds in Gwinnett County, Georgia. 2014-01-01.