Since 2001, the United States Geological Survey (USGS) has collected water-resources data in all 50 states and beyond. The organization has studied groundwater, surface water, water quality and water use through initiatives such as the National Streamflow Information Program (NSIP), which used to be known as Federal Priority Streamgages (FPS) program. Almost one year into the program, we have seen consistent results showing that the Senix system provides the same level of data accuracy as the USGS. Variance of less than .25 inches were noted on occasion, which can be attributed to the lack of synchronization of when readings were recorded in the two systems and natural diurnal temperature changes that can affect the speed of sound. As you can see from the following graphs, the displayed values plot the same data.
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