For more information on the USGS-the Federal source for science about the Earth, its natural and living resources, natural hazards, and the environment, visit http://www.usgs.gov/ or call 1-888-ASK-USGS.For an overview of USGS information products, including maps, imagery, and publications, visit http://www.usgs.gov/pubprod/ To order this and other USGS information products, visit http://store.usgs.gov/ Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.Although this information product, for the most part, is in the public domain, it also may contain copyrighted materials as noted in the text. Permission to reproduce copyrighted items must be secured from the copyright owner.Suggested citation: Barlow, P.M., Cunningham, W.L., Zhai, Tong, and Gray, Mark, 2015, U.S. Geological Survey Groundwater Toolbox, a graphical and mapping interface for analysis of hydrologic data (version 1.0)-User guide for estimation of base flow, runoff, and groundwater recharge from streamflow data: U.S. Geological Survey Techniques and Methods, book 3, chap. B10, 27 p., http://dx.doi.org/10.3133/tm3B10. ISSN 2328-7055 (online) iii Preface This report is a user guide for the streamflow-hydrograph analysis methods provided with version 1.0 of the U.S. Geological Survey Groundwater Toolbox. These include six hydrograph-separation methods to determine the groundwater-discharge (base-flow) and surface-runoff components of streamflow-the Base-Flow Index (BFI; Standard and Modified), HYSEP (Fixed Interval, Sliding Interval, and Local Minimum), and PART hydrograph-separation methods-and the RORA recession-curve displacement method and supporting RECESS program to estimate groundwater recharge from streamflow data. The performance of the program has been tested in a variety of applications, some of which are documented in this report. Future applications, however, might reveal errors that were not detected in the test simulations. Users are requested to notify the U.S. Geological Survey (USGS) of any errors found in this report or the computer program.Although this computer program has been written and used by the USGS, no warranty, expressed or implied, is made by the USGS or the U.S. Government as to the accuracy and functionality of the program and related program material, nor shall the fact of distribution constitute any such warranty, and no responsibility is assumed by the USGS in connection therewith. The Groundwater Toolbox and other groundwater programs are available online from the USGS at http://water.usgs.gov/software/lists/groundwater/. Information on how to download and install the program can be found at that Web site.
AcknowledgmentsWe thank our U.S. Geological Survey (USGS) colleagues David Nelms and Richard Healy for their review of the Groundwater (GW) Toolbox and an earlier draft of this report. We also thank Leslie DeSimone and Anna Glover, USGS, for their editorial comments on the draft report. David Nelms and Ronald Sloto of the USGS and T...
