Appendix B: Bioengineering for Streambank Erosion Control -- Guidelines
Ground Photographic Coverage. Monitoring, at a minimum, should be an array of
photographs taken from the same photo point in the same directions so that later comparisons
of streambank development or degradation can occur very readily. Preferably, this will be
used to supplement the aerial photo coverage and measurements mentioned above. Photos
should be taken at established photo points with photos taken periodically for a given
azimuth. These should be taken at the same time the aerial photos are taken, again at low
water periods, if possible; however, others can be taken at intermittent times if deemed
necessary.
Ocular Description. As a further effort to document erosion, a description of any erosive
processes must be made at the same time the ground photos are made. Processes that must
be documented and particularly noted include such things as slumping from geotechnical
failures, rilling, gullying, toe undercutting or launching, flanking at upper or lower ends of
treatment, and scouring at other areas within the reach from either current or wave action.
Descriptive estimates of degree of severity for each of the above processes per treatment and
reach with backup photos should be made.
Figure 44. Aerial monitoring of bioengineering treatment. (from Logan et al. 1979)
B-80
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