USGS - science for a changing world

USGS Surface Water Information

 Home Data Info Data & Information Activities Activities Methods & Modeling Methods & Modeling Publications Publications OSW Contact Contact Us

New & Noteworthy

T&M Chapters
Stage, Discharge, & Levels

WaterAlert USGS WaterAlert

Streamflow Summary 2014 Streamflow Summary

Threatened Streamgages Threatened and Recently Discontinued Streamgages

Calendar Streamgaging Calendar

Today's Water Conditions

View maps of current and historical conditions

Click map to go to current water resources conditions in the U.S. WaterWatch Streamflow
Flood & High Flow Flood and high flow
Drought Drought
Groundwater Networks Groundwater levels
Water Quality Watch Surface water quality

SWToolbox Testing Information

USGS and EPA have combined their SWSTAT and DFLOW software programs into a new tool, the SWToolbox. This software is currently available only for the purpose of demonstration and testing. It is not yet approved for public release.

Overview and Help

The software is designed to facilitate easy import of USGS NWIS streamflow data and also user-defined text files. Its primary functions are to conduct a n-day frequency analysis (most commonly used for computation of 7Q10) and to compute biologically-based flows. Flow duration curves can also be computed.

The software is built on the BASINS system. The SW Toolbox Documentation found under the Help menu provides information on the functionality of the software. Most of the information on use of the software is general and applies to all applications built on the BASINS platform.

Demo: A PDF that highlights the material covered in the August 25, 2016 demo is available here: SWToolbox_Demo_08-25-2016.pdf.

Software and Manual Release

The software and accompanying user manual are being finalized for publication and will be posted here as soon as possible. If you would like to be notified when they are released, please click here to leave your information .


We are looking for feedback on the SWToolbox software. If you encounter any problems, please let us know by sending an email to


USGS Home Water Resources Biology Geography Geology Geospatial

Accessibility FOIA Privacy Policies and Notices

Take Pride in America logo logo U.S. Department of the Interior | U.S. Geological Survey
Page Contact Information: USGS Office of Surface Water
Page Last Modified: Thursday, 08-Feb-2018 09:49:43 EST