![debrisflow.jpg (51461 bytes)](debrisflow_small1.jpg) |
The
image at left is by Dr. William Weaver from his work at Redwood National
Park and shows typical debris flow locations derived from Park studies.
The illustration shows that roads may trigger failures when crossing headwater
swales. Note also that failures in upslope areas may be linked to culvert
and fill failures further down the drainage. Failures of multiple crossings
tend to have very significant impacts on stream reaches below. |