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Water Software > Groundwater Software > PART

PART: A computerized method of base-flow-record estimation

The computer program PART uses streamflow partitioning to estimate a daily record of groundwater discharge under the streamflow record. The method designates groundwater discharge to be equal to streamflow on days that fit a requirement of antecedent recession, linearly interpolates groundwater discharge for other days, and is applied to a long period of record to obtain an estimate of the mean rate of groundwater discharge.

This web site includes information about the use of the PART 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.

PART Downloads

  • Notice to users: USGS has received reports that SCREEN.exe and PART.exe are being flagged as malware by some antivirus programs. (SCREEN is a utility program distributed with PART.) To the best of our knowledge, these are false-positive reports for the original .EXE files served from this web site. Please note that the USGS has no control over files distributed from non-USGS.gov web sites; the only official USGS versions of PART and SCREEN are served from this web page. If you have additional questions, please contact us at ogw_webmaster@usgs.gov.
  • PART version 2.0 software, documentation, and sample data sets (1.3MB EXE ), updated March 2012
  • README file describing files included in EXE file, including a version history

Background Literature

PART is described in the following documents:

Useful Resources

The following resources may also be of use:

Related Software: Groundwater Toolbox

PART 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 PART is intended to work. Only limited assistance can be provided for applying PART to specific problems. Comments and questions can be sent to Paul Barlow.

Other USGS Groundwater Software

The USGS develops groundwater RSS, 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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Page Last Modified: Thursday, 05-Mar-2015 17:19:23 EST