The National Oceanic and Atmospheric Administration (NOAA) and USGS both maintain networks of rain gauges across the United States, and data from them are available for public use. Our recommendation is that you can use them to supplement your own rainfall monitor network when they are available but do your homework and use some caution. Also, never rely on them as your sole source of rainfall data. Before you consider using one, first Investigate data availability. We have seen some of these rain gauges where data is intermittent and not always available for the time periods needed. Second, investigate the sample rate reported by the rain gauge. Some locations only report daily totals or hourly totals. A sample rate of 5-minutes is preferred for most I/I studies and related hydraulic modeling applications.
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