Wahleach Project Water Use Plan Wahleach Reservoir ... - BC Hydro

deep water zone of the reservoir and to enable acoustic assessment of the near
shore, shallow habitat areas. Horizontal side scanning is used when surveying
shallow waters as this method samples a larger volume of water than vertical
sounding. The method covers a greater area so more fish targets are detected and
it’s harder for the fish to avoid the echo beam
11) A “hydroacoustic workshop” should be planned with previous contractors to
discuss methodology to ensure consistency in the long term data set is maintained.
A better understanding of previous acoustic surveys details would assist in
determining how the change in equipment may have affected trends in acoustic
population estimates. A number of questions and concerns with comparability of
current and past abundance estimates and best methods to monitor species
composition will be addressed in future surveys.
Wahleach Reservoir Fertilization Project, 2004-2006.
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