This manual establishes the surveying procedures for (1) setting gages at a streamflow gaging station to datum and (2) checking the gages periodically for errors caused by vertical movement of the structures that support them. Surveying terms and concepts are explained, and procedures for testing, adjusting, and operating the instruments are described in detail. Notekeeping, adjusting level circuits, checking gages, summarizing results, locating the nearest National Geodetic Vertical Datum of 1929 bench mark, and relating the gage datum to the national datum are also described.
Additional publication details
USGS Numbered Series
Levels at streamflow gaging stations
Techniques of Water-Resource Investigation
U.S. G.P.O. ;For Sale by the Books and Open-File reports Section, U.S. Geological Survey,