Oklahoma StreamStats
By StreamStats
Oklahoma StreamStats was developed in cooperation with the Oklahoma Department of Transportation and the Oklahoma Water Resources Board.
Oklahoma StreamStats incorporates statewide regression equations for estimating instantaneous peak flows with annual exceedance probabilities of 50, 20, 10, 4, 2, 1, and 0.2 percent, including new peak-flow regression equations for the Panhandle that were published on Sept. 28, 2015. These peak flows have recurrence intervals of 2, 5, 10, 25, 50, 100, and 500 years, respectively. Oklahoma StreamStats also incorporates regional regression equations for estimating the mean annual flow and annual and monthly flow exceeded 20, 50, 80, 90, and 95 percent of the time. The reports below document the regression equations, the methods used to develop them and to measure the basin characteristics used in the equations, and the errors associated with the estimates obtained from the equations. Users should familiarize themselves with these reports before using StreamStats to obtain estimates of flows for ungaged sites in drainage basins.
- 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, 42 p.
- Esralew, R.A., 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, 131 p.
- Smith, S.J., Lewis, J.M., and Graves, G.M., 2015, Methods for estimating the magnitude and frequency of peak streamflows at ungaged sites in and near the Oklahoma Panhandle: U.S. Geological Survey Scientific Investigations Report 2015–5134, 35 p.
Click on this link to obtain general information on the Oklahoma application, as well as specific sources and computation methods for basin characteristics.
Notice: A migration on December 12, 2025, replaced a corrupted elevation raster for HUC 11040001. |
Notice: A migration on May 16, 2025, added exclusion polygons to streams where large upstream delineations originate from out of state and may not be correct as these areas were not originally processed for the Oklahoma application. |
Notice: In September of 2025, adjustments were made to hydrologic unit (HUC) 11120301, near the outlet, to correct Open Source global delineations. Adjustments included:
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Notice: Between approximately May 19, 2015, and November 1, 2015, Oklahoma’s StreamStats application was producing peakflow estimates based on an incorrect precipitation grid. Differences in the precipitation amounts varied with location and basin size, but the incorrect precipitation values averaged approximately 6 percent lower than the correct values. While these incorrect precipitation values would have resulted in peakflow estimates with a low bias, the error would be within the model error of the peakflow regression equations. |
Related
Methods for estimating the magnitude and frequency of peak streamflows at ungaged sites in and near the Oklahoma Panhandle Methods for estimating the magnitude and frequency of peak streamflows at ungaged sites in and near the Oklahoma Panhandle
This report presents the results of a cooperative study by the U.S. Geological Survey and the Oklahoma Department of Transportation to estimate the magnitude and frequency of peak streamflows from regional regression equations for ungaged stream sites in and near the Oklahoma Panhandle. These methods relate basin characteristics (physiographic and climatic attributes) to selected peak...
Authors
S. Jerrod Smith, Jason M. Lewis, Grant M. Graves
Methods for estimating the magnitude and frequency of peak streamflows for unregulated streams in Oklahoma Methods for estimating the magnitude and frequency of peak streamflows for unregulated streams in Oklahoma
Peak-streamflow regression equations were determined for estimating flows with exceedance probabilities from 50 to 0.2 percent for the state of Oklahoma. These regression equations incorporate basin characteristics to estimate peak-streamflow magnitude and frequency throughout the state by use of a generalized least squares regression analysis. The most statistically significant...
Authors
Jason M. Lewis
Methods for estimating flow-duration and annual mean-flow statistics for ungaged streams in Oklahoma Methods for estimating flow-duration and annual mean-flow statistics for ungaged streams in Oklahoma
Flow statistics can be used to provide decision makers with surface-water information needed for activities such as water-supply permitting, flow regulation, and other water rights issues. Flow statistics could be needed at any location along a stream. Most often, streamflow statistics are needed at ungaged sites, where no flow data are available to compute the statistics. Methods are...
Authors
Rachel A. Esralew, S. Jerrod Smith
Related
Methods for estimating the magnitude and frequency of peak streamflows at ungaged sites in and near the Oklahoma Panhandle Methods for estimating the magnitude and frequency of peak streamflows at ungaged sites in and near the Oklahoma Panhandle
This report presents the results of a cooperative study by the U.S. Geological Survey and the Oklahoma Department of Transportation to estimate the magnitude and frequency of peak streamflows from regional regression equations for ungaged stream sites in and near the Oklahoma Panhandle. These methods relate basin characteristics (physiographic and climatic attributes) to selected peak...
Authors
S. Jerrod Smith, Jason M. Lewis, Grant M. Graves
Methods for estimating the magnitude and frequency of peak streamflows for unregulated streams in Oklahoma Methods for estimating the magnitude and frequency of peak streamflows for unregulated streams in Oklahoma
Peak-streamflow regression equations were determined for estimating flows with exceedance probabilities from 50 to 0.2 percent for the state of Oklahoma. These regression equations incorporate basin characteristics to estimate peak-streamflow magnitude and frequency throughout the state by use of a generalized least squares regression analysis. The most statistically significant...
Authors
Jason M. Lewis
Methods for estimating flow-duration and annual mean-flow statistics for ungaged streams in Oklahoma Methods for estimating flow-duration and annual mean-flow statistics for ungaged streams in Oklahoma
Flow statistics can be used to provide decision makers with surface-water information needed for activities such as water-supply permitting, flow regulation, and other water rights issues. Flow statistics could be needed at any location along a stream. Most often, streamflow statistics are needed at ungaged sites, where no flow data are available to compute the statistics. Methods are...
Authors
Rachel A. Esralew, S. Jerrod Smith