AVAILABILITY OF DATA

Sediment data described in this report are available from WATSTORE (National Water Data Storage and Retrieval System). The system is operated and maintained on the central computer facilities of the U.S. Geological Survey at its National Center in Reston, Virginia. Sediment data are archived in the form of daily values and lab analyses of suspended sediment and bed material. Information about acquiring data from WATSTORE can be obtained by writing to:

Chief Hydrologist
U.S. Geological Survey
437 National Center
Reston, Virginia  22092

Sediment data described in this report also are available on computer diskettes from the U.S. Geological Survey. The data are arranged chronologically in ASCII files of several columns, which makes them immediately usable by personal computers. Although this information is available directly from WATSTORE, the processing necessary to create the ASCII files already has been performed for the data user.

Several types of sediment data files were made from the WATSTORE data. Daily values of mean discharge, sediment discharge, and mean concentration are listed for the entire study period. Dates are specified by the number of days after January 1, 1980. Files of instantaneous values of suspended-sediment concentration include concurrent stream discharge and sand-division data. Days are in calendar format; times are in days after January 1, 1980 (decimal form) and in 24-hour format. Files that summarize the statistics of bed-material samples were prepared from particle-size distributions. All file formats are described in a separate file called README.DOC. Diskettes of these data files can be obtained by writing to:

U.S. Geological Survey
David A. Johnston Cascades Volcano Observatory
5400 MacArthur Boulevard
Vancouver, Washington  98661

DOWNLOAD SEDIMENT DATA FILES

To obtain sediment data files directly, go to the README.DOC and find the files of interest.

Some non-routine sediment data are not available from primary databases such as WATSTORE, because the observations were taken for research projects. However, further analyses of sediment transport are possible with the detailed records. A partial listing of the archived data files is given below.

Archived data files at Cascades Volcano Observatory for Mount St. Helens study area:

• Stream-discharge measurements;
• Channel surveys at monumented cross sections;
• Concentration and size analyses of individual sediment samples;
• Concentration of automatic sediment samples;
• Sediment concentrations of calibration samples;
• Sediment concentrations at centroids of equal discharge in cross section (see also open-file report by Childers and others, 1988;
• Unit value files of stream discharge, sediment concentration, and sediment discharge;
• Bedload sample data;
• Water quality records: sample analyses of multiple water-quality parameters in WATSTORE; data for March to September 1980 in open-file report by Turney and Klein (1982);
• Vertical-profile measurements at research sites: data in open-file report by Dinehart, 1987;
• Bedform-migration records: North Fork Toutle River at Kid Valley (Dinehart, 1992a)
• Streamflow measurements at miscellaneous sites in study area: data in WATSTORE; summarized in open-file report by Williams and Riis (1989).

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