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The StreamStats Program


Beta version 4 has arrived!

Beta version 4 is now available for most states on a trial basis, and version 3 remains available. Beta version 4 provides a single user interface (at for all states that are implemented, rather than separate applications for each state, as in versions 2 and 3, and the user interface is more user friendly than previous versions. Information for user-selected ungaged sites currently cannot be obtained using beta version 4 for the States of Iowa, Indiana, North Carolina, and Oregon because of unique functionality for those states that is not yet implemented. Users are encouraged to provide comments and report bugs by use of the Help button on the interface, which also provides access to limited beta version 4 documentation. See below for additional information about versions both 3 and 4.

Please contact the StreamStats by email at if you have any questions.

StreamStats for Virginia can be used to estimate the magnitude of peak flows for Virginia streams under rural, natural streamflow conditions at the 2-, 5-, 10-, 25-, 50-, 100-, and 200-year recurrence-intervals, and under urban conditions at the 1.005-, 1.01-, 1.05-, 1.11-, 1.25-, 1.49-, 2.0-, 2.3-, 5-, 10-, 25-, 50-, 100-, 200-, and 500-year recurrence intervals. StreamStats for Virginia may also be used to estimate the magnitude of low flows for Virginia streams under rural, natural streamflow conditions at the 1-, 4-, 7-, and 30-day average 1.11, 1.25, 1.43, 1.67, 2.0, 2.5, 3.3, 5, 10, 20, 50, 100, and 200 year recurrence-intervals. In addition to streamflow statistics, basin characteristics for a variety of land cover, elevation, precipitation, soils, streams, and geology are available for download with watershed delineations. The reports below present the equations used to estimate the flow statistics, describe the errors associated with the estimates, and describe the methods used to develop the equations and to measure the basin characteristics used in the equations. Users should familiarize themselves with the reports before using StreamStats to obtain estimates of streamflow statistics for ungaged sites.


Interactive Map


General information on the Interactive Map application, as well as specific sources and computation methods for basin characteristics are available here.

NOTE: Virginia StreamStats operates in a unique manner when a delineated basin has drainage area that is in multiple hydrologic regions. Normally in these cases, StreamStats provides flow estimates using the equations for each hydrologic region and then produces final estimates that weight the estimates from each hydrologic region according to the percentage of the region that is in the delineated basin. However, only the regression equations for the hydrologic region with the largest proportion of area within the delineated drainage basin are used to provide flow estimates for Virginia StreamStats.


StreamStats for Virginia was developed in cooperation the Virginia Department of Tansportation (VDOT) and the Virginia Department of Environmental Quality (VDEQ).

Link to the Virginia Department of Transportation
Link to the Virginia Department of Environmental Quality

Contact Us if you experience any problems with this application.

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