Operational Plan for the Restoration of Diadromous Fishes to the ...

Discharge through the study area is unregulated, and therefore subject to precipitation
and climatic events. A staff gage was semi-permanently installed in the vicinity of each study
site to verify that discharge remained adequately stable during hydraulic measurements and also
to potentially serve as reference should future site visits occur at other discharge levels. Stage
(water height) was recorded at the beginning and end of each survey.
A discharge measurement transect was located in the vicinity of the study area in a
location featuring a relatively flat stream bottom with non-turbulent flow. Velocity was
measured at intervals along the transect to the nearest 0.1-ft/s , using a calibrated Marsh-
McBirney Model 2000 Flowmate electronic current meter attached to a top-setting wading rod.
In water less than 2.5-ft deep, mean-column-velocity was measured at 0.6 of the depth. In water
greater than 2.5-ft deep, mean-column-velocity was taken as the average of the velocities
measured at 0.2 and 0.8 of the depth. Each point velocity measurement used on a given vertical
was the mean of a series of 20-second time-averaged readings.
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