Stage and Pore Pressure
A non-contact stage sensor (on bridge at left) is suspended approximately 2 meters above two pressure transducers (not visible) and a force plate (silver square) mounted in the channel bed.
Stage is measured by a non-contact distance meter suspended over the channel. The device measures the distance from the sensor to the surface below. When no runoff is present, the measurement surface is the surface of the channel bed. Distance measurements are converted into a stage above a datum, which is 0.5 m beneath the bedrock channel. Changes in stage detected by the sensor when no runoff is present are usually caused by infilling of the channel by dry ravel processes.
Pressure transducers are used to measure fluid pressures in the pores of the bed directly beneath the stage gage. The pressure transducers are installed next to the force place in the bed of the channel. Pressure is displayed as an equivalent depth of water in meters. The measurement includes pore water pressure and barometric pressure. Barometric pressure is measured by a separate instrument above the channel and has not been removed from the data displayed.
WARNING: Provisional data, subject to revision
Stage, pore pressure, and rainfall for last hour
Stage, pore pressure, and rainfall for last 3 days
Stage and signal quality for last day
