[Science_Parameters: Science_Category='EARTH SCIENCE', Science_Topic='TERRESTRIAL HYDROSPHERE', Science_Term='SURFACE WATER', Science_Variable_Level_1='SURFACE WATER FEATURES', Science_Variable_Level_2='RIVERS/STREAMS']
Channel Geometry Analysis Program (CGAP)Entry ID: USGS_CGAP
Abstract: The Channel Geometry Analysis Program (CGAP) permits the analysis, interpretation, and quantification of the physical properties of an open-channel reach as defined by a sequence of cross sections. The primary function of the program is to compute the area, width, wetted perimeter, and hydraulic radius of cross sections at successive increments of water-surface elevation (stage) from data that ... consist of coordinate pairs of cross-channel distances and land-surface or channel-bottom elevations. Longitudinal rates-of-change of cross-sectional properties are also computed. In addition, the mean properties (including discharge as computed using the Manning's equation) of a channel reach and the cross-sectional area and channel widths as functions of stage for subdivisions of a cross section can be computed. CGAP was developed to compute, display, and otherwise format cross-sectional data for use with simulation models. CGAP produces files of data in the required input format for BRANCH and HSPF (the latter after use of the program genftbl--generate F- Table--provided with CGAP). CGAP has 17 output options that produce the following forms of output: tabular lists, sequential files, and (or) graphical plots in digital or line-printer format.
Role: TECHNICAL CONTACT
Email: h2osoft at usgs.gov
U.S.G.S. Hydrologic Analysis Software Support Program 437 National Center
Province or State: VA
Postal Code: 20192
Regan, R.S., and Schaffranek, R.W., 1985, A computer program for
analyzing channel geometry: U.S. Geological Survey Water-
Resources Investigations Report 85-4335, 40 p.
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