USGS Groundwater Information
New & Noteworthy
USGS Groundwater Watch
USGS maintains a network of active wells to provide basic statistics about groundwater levels.
USGS in Your State
USGS Water Science Centers are located in each state.
Other USGS Water Science Areas
RECESS: A computer program for analysis of streamflow recession
The RECESS program is used to determine the recession index and to define the master recession curve from analysis of streamflow records.
This web site includes information about the use of the RECESS computer program for analyzing a streamflow record. The version at this site will read streamflow data in the format that is available from USGS web sites. This version is provided with a graphics application for viewing recession segments.
RECESS is described in the following documents:
The following resources may also be of use:
Related Software: Groundwater Toolbox
RECESS users may also be interested in the Groundwater Toolbox, a graphical and mapping interface for analysis of hydrologic data. The Groundwater Toolbox has several methods for the analysis of streamflow data. These methods include six hydrograph-separation techniques — the Base-Flow Index (BFI Standard and Modified), HYSEP (Fixed Interval, Sliding Interval, and Local Minimum), and PART methods — and the RORA recession-curve displacement method and associated RECESS program to estimate groundwater recharge from streamflow data.
Point of Contact
Support is provided for correcting bugs and clarification of how RECESS is intended to work. Only limited assistance can be provided for applying RECESS to specific problems. Comments and questions can be sent to Paul Barlow.
Other USGS Groundwater Software
The USGS develops groundwater , water-quality, surface-water, and other water-resources software for use by the USGS in fulfilling its mission. Most of this software is available online for download at no charge.
Disclaimers and Notices
Please refer to the USGS Software User Rights Notice for complete use, copyright, and distribution information. The USGS provides no warranty, expressed or implied, as to the correctness of the furnished software or the suitability for any purpose. The software has been tested, but as with any complex software, there could be undetected errors. Users who find errors are requested to report them to the USGS.
References to non-USGS products, trade names, and (or) services are provided for information purposes only and do not constitute endorsement or warranty, express or implied, by the USGS, U.S. Department of Interior, or U.S. Government, as to their suitability, content, usefulness, functioning, completeness, or accuracy.
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