Installation of a fixed ADCP for use in measuring index velocity.

With ADCPs, measuring and computing continuous records of streamflow can be conducted in challenging environments. Until the advent of ADCPs, it was difficult or impractical to accurately compute streamflow records on tidally affected rivers or rivers affected by backwater. Two-beam ADCPs can be attached to a fixed structure, such as a pile or bridge pier, and used to measure velocity horizontally for a portion of a channel cross section. The measured velocity at a fixed point in the cross section can be used to compute continuous streamflow records.