Availability of Baseplot and Hydcomp software, user documentation, and support In Reply Refer To: April 3, 2003 Mail Stop 415 OFFICE OF SURFACE WATER TECHNICAL MEMORANDUM NO. 2003.03 SUBJECT: Availability of “Baseplot” and “Hydcomp” software, user documentation, and support This memorandum announces the availability of “Baseplot” and “Hydcomp” streamflow records review software and provides access information for documentation and user support of those programs. Over the last several years, Lamar Sanders of the South Carolina District, has developed two computer programs to aid U.S. Geological Survey personnel in the checking and reviewing of primary streamflow records. The Office of Surface Water, the Southeastern Region, and the South Carolina District funded program enhancements and documentation. The resulting programs, known as BASEPLOT and HYDCOMP, were distributed to districts in the Southeast Region and have been used extensively in records review and hydrologic surveillance by those districts. A recent survey of several of these districts indicated that the programs increased the efficiency of records preparation and review and aided the management of their networks. These software tools are being announced with the expectation that others may also find them useful and experience increased efficiencies. The current stand-alone programs are based on the Statistical Analysis System (SAS) and have the following capabilities: BASEPLOT: This Program produces tabular and graphical displays of data from measurement, rating, unit values (UV), and daily values (DV) files for use in quality control of surface-water discharge (stage-discharge ratings) records. A questionnaire/review form is available for each BASEPLOT display to guide, facilitate, and document the records-checking process. Specific displays include: 1. Plots of ratings and measurements; 2. Plots of stage-shift curves; 3. Plots of shift curves in terms of stage and flow; 4. Plots of hydrographs showing: (a) Unit-value gage heights, shifts corrections, and datum corrections; (b) Input datum and shift correction data points; (c) Discharge measurements, and (d) Numeric quality control checks; 5. Tables of numeric quality-control checks, in addition to measurement and shift correction data. HYDCOMP: This Program computes estimated daily values based on regression with DV records from one or two index stations. The estimates can be used to help fill in gaps in record or for quality control through objective comparisons with computed discharge at nearby/similar gaging stations. The program outputs estimated data in a flat file that the user must manually input to ADAPS. The HYDCOMP program: 1. Automatically selects 5 "best" index stations in the state by correlation and regression; 2. Produces the standard error of estimate for evaluating the accuracy of the regression; 3. Estimates missing flows and, if specified by the user, erroneous nonmissing flows; 4. Smooths estimated flows using a Kalman-filter smoothing algorithm, and 5. Produces DV hydrographs of estimated flow data, observed flow data, 95 percent confidence limits, discharge measurements, and limits of regression. Quality control is achieved by comparison of observed flow data with 95 percent confidence limits on the hydrograph. To assist users of these programs, two user's manuals were recently published as U.S. Geological Survey Open-File Reports. The reports, titled "User's Manual for Computer Program BASEPLOT" (OFR 02-151) and "Daily Values Flow Comparison and Estimates Using Program HYDCOMP, Version 1.0" (OFR 02-286), are currently available for download as Adobe Acrobat PDF files on the South Carolina District web page. Complete instructions on downloading, installing, and executing the programs can be found in the user's manuals. The respective URLs for the BASEPLOT and HYDCOMP user's manuals are http://pubs.usgs.gov/of/2002/ofr02151/ and http://pubs.usgs.gov/of/2002/ofr02-286/. In addition to the user manuals, the South Carolina District has agreed to provide limited user support for these programs through October 2003. /signed/ Stephen F. Blanchard Chief, Office of Surface Water Distribition Code: A, B, DC, CD, FO, PO, and District SW Specialists