Transmittal of Report, "A Computer Program (FLOWSTAT) for Summarizing Daily and Peak Streamflow Statistics," In Reply Refer To: August 18, 1992 Mail Stop 415 OFFICE OF SURFACE WATER TECHNICAL MEMORANDUM NO. 92.12 SUBJECT: Transmittal of Report, "A Computer Program (FLOWSTAT) for Summarizing Daily and Peak Streamflow Statistics," by G. D. Rogers and M. R. Werley The subject report, which has been released as U.S. Geological Survey (USGS) Open-File Report 92-115, 17 pages, describes a computer program that has been used by several Districts for compilation of streamflow statistics for publication. The program performs few statistical calculations itself, but instead reformats statistical information retrieved from the WATSTORE mainframe computer into a format suitable for publication. The program thus can reduce the routine clerical labor required for preparation of a streamflow statistics report. The statistics compiled by this program include annual peak-flow, high-flow, and low-flow frequencies. As noted in the report, these frequency-analysis results are interpretive information that must be reviewed and possibly revised for reasonable hydrologic interpretation, and must receive Director's approval for release. The program is designed to facilitate any necessary manual revisions of the statistics. As noted in the report, authors of streamflow statistics reports are responsible for adequacy of hydrologic interpretations. Instructions for obtaining, installing, and using the software are included in the report. Two copies of the report are provided for reference and possible use. Please bring this material to the attention of computer and hydrologic specialists in your office who may be concerned with preparation of streamflow statistics reports. Charles W. Boning Chief, Office of Surface Water Attachments (2) WRD DISTRIBUTION: SL SELECT LIST: Each District and State Office Florida Subdistricts Darrell D. Carlson, Atlanta, Georgia Kenneth M. Nolan, Menlo Park, California Arthur G. Scott, Reston, Virginia Kenneth L. Wahl, Lakewood, Colorado