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USGS in Your State

USGS Water Science Centers are located in each state.

RORA: The recession-curve-displacement method for estimating recharge

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

The computer program RORA estimates ground-water recharge using the recession-curve-displacement method. The method is based on the change in total potential ground-water discharge that is caused by each recharge event.

RORA Downloads

• Download RORA software executable files and sample data sets (690kb ZIP file, updated January 2007)
• Download README file describing files included in ZIP file
• Download fortran source code (10KB ZIP file)
• Download user's manual (50KB PDF file)

Background Literature

The user's manual does not include complete explanation of the computer program; the program user is referred to the documentation report (first item below). Additional information is provided below.

• Computer programs for describing the recession of ground-water discharge and for estimating mean ground-water recharge and discharge from streamflow records: USGS WRIR 98-4148.
• Considerations for use of the RORA program to estimate ground-water recharge from streamflow records: USGS OFR 00-156.
• Testing an automated method to estimate ground-water recharge from streamflow records: Ground Water, vol. 32, no. 2, pp. 180-189, 1994.
• Use of RORA for complex ground-water flow conditions: USGS WRIR 03-4304
• Obtaining streamflow data from a USGS web site.
• USGS Water Resources Applications Software
• USGS Ground-Water and Surface-Water Interactions web site.

Point of Contact

Comments about this site can be sent to Paul Barlow.