ABSTRACT
Selection of aquatic biological parameters is complicated due to system relationships in terms of material and energy flows. An important element in planning a river study is to carefully identify hydraulic, water quality, biological, and sediment parameters to be monitored. One approach which can be used in the selection of water quality parameters to be monitored is to utilize general recommendations for conduction of water quality surveys. Due to variations of the concentrations of various water quality constituents with time and stream flow, it is necessary that information be available on flow frequencies in the study river. Most stream-gaging discharge measurements are made by the area-velocity method using a current meter to measure the velocity. For measuring velocities in streams with a depth of 0.5 feet or less, greater accuracy may be achieved by using a small Price-type meter called the pigmy current meter.
