The content of the map database can be described in terms of the lines, areas, and points that compose the map, which are summarized in table 3. Descriptions of the database fields use the terms explained in table 4. The shaded-relief topographic base was created by Graham using relations provided by R.A. Haugerud. In any one storm only a small fraction of the potential source areas may be activated. Most debris flows in the San Francisco Bay region travel only several tens of yards or less, but some may travel hundreds of yards downslope from their sources and others have traveled as much as a mile or more down stream channels.
Numbers refer to typical hazardous locations discussed in text.
Erratic behavior of ratio at high values of steepness and low values of curvature results from sparsity of data points. Grid sfbr-df, etc. Points sfbr-dfs, etc. Arcs sfbr-dfml, etc.