The U.S. Geological Survey (USGS), in cooperation with DuPage County Stormwater Management Department, developed a watershed data management (WDM) database of hourly meteorological and hydrologic data for use in a near real-time streamflow simulation system. This WDM database is updated at least weekly by USGS staff with the latest available data. These data are initially provisional and may have periods of missing or flawed data due to equipment malfunctions or other problems. To improve the accuracy of simulations, the WDM database is updated and corrected with quality-assured and quality-controlled (QA/QC) data for each water year (a water year is the 12-month period, October 1 through September 30, in which...
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