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Streambank Erosion Risk  Streambank erosion can be a large
contributor to total sediment supply and is associated with
river instability, land loss, fish habitat loss, flood issues
and many other related problems. For appropriate mitigation,
identification of the sources of the sediment and stability
problems is essential. Since streambanks can be directly
observed and measured, inference from observed relations are
used to provide a risk assessment. Data required for this level
are as follows:  a) Stream types b) Aerial photographs, drainage
area maps c) Regional curves (bankfull dimensions vs drainage
area) d) Bankfull width e) Radius of curvature f) Riparian
species composition g) Bank height h) Bankfull depth  The
relation developed for riparian vegetation composition
represents the susceptibility of streambanks to erosion. The
rooting depth and density associated with the riparian plant
community is very important to reduce the risk of bank failures.