Oklahoma Water Science Center
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StreamStats – Estimating drainage basin characteristics and streamflow statistics for ungaged streams in Oklahoma
By S. Jerrod Smith and Rachel A. Esralew
The U.S. Geological Survey (USGS) periodically publishes streamflow statistics, such as flood-frequency, flow-duration, and mean annual streamflow statistics, for gaged sites with long-term record. Regionalized regression methods recently have been developed for estimating many of these streamflow statistics at ungaged sites as a function of measured physical and climatic drainage basin characteristics.
The USGS Streamflow Statistics (StreamStats) Program was developed, in cooperation with ESRI, to make estimation of basin characteristics and streamflow statistics at ungaged sites easier, faster, and more consistent for the average user than previously employed manual techniques. Manual measurement of drainage basin characteristics is inconsistent, prone to error, and can take hours or days for large basins. Geographic Information System (GIS) techniques can produce drainage basin characteristics in seconds with greater accuracy and reproducibility.
The StreamStats user-interface is an Internet-based GIS application that allows users to easily obtain streamflow statistics, basin characteristics, and other information for user-selected USGS data-collection stations and ungaged sites of interest. To estimate streamflow statistics at ungaged sites, the StreamStats application relies on the data collected at USGS streamflow gages, on-the-fly measurements of physical and climatic drainage basin characteristics, and published regionalized regression equations. The StreamStats application interface allows the user to:
The Oklahoma StreamStats application covers most areas within the state of Oklahoma. Basin characteristics available for computation include contributing drainage area, contributing drainage area minus area regulated by floodwater retarding structures, mean annual precipitation at the basin outlet, and main-channel 10-85 stream slope (Smith and Esralew, 2010). Streamflow statistics now available for computation include the peak flow at 2-, 5-, 10-, 25-, 50-, 100-, and 500-year recurrence intervals for rural, unregulated streams or rural streams that are regulated by NRCS FWR structures (Lewis, 2010). Oklahoma StreamStats also provides estimates of monthly, seasonal, and annual flow-duration statistics and annual mean flow statistics for sites on ungaged streams in cooperation with the Oklahoma Water Resources Board(Esralew and Smith, 2009).
Esralew, R.A., and Smith, S.J., 2009. Methods for Estimating Flow-Duration and Annual Mean-Flow Statistics for Ungaged Streams in Oklahoma. U.S. Geological Survey Scientific Investigations Report 2009-5267, 53 p.
Lewis, J.M., 2010, Methods for estimating the magnitude and frequency of peak streamflows for unregulated streams in Oklahoma: U.S. Geological Survey Scientific Investigations Report 2010-5137, 41 p.
Smith, S.J., and Esralew, R.A., 2010. StreamStats in Oklahoma - Drainage-Basin Characteristics and Peak-Flow Frequency Statistics for Ungaged Streams. U.S. Geological Survey Scientific Investigations Report 2009-5255, 59 p.