Flow Stage and Pore Pressure
Stage data is only available during rain events from the laser distance meter.
The radar distance and pore pressure sensors were destroyed by a debris flow on Jan. 18, 2010, at 12:03 pm.
Stage is measured by both radar and laser distance meters suspended over the channel. Both devices 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 below bedrock.
The radar sensor is better suited for measuring clear-water flows, while the laser is better suited for resolving rapid stage changes associated with fast-moving debris flows. The laser is only operated during rain events to conserve power.
A pressure transducer vented to the atmosphere is used to measure fluid pressures in the pores of the bed directly beneath the stage gage. The pressure transducer is mounted in the bedrock. Pressure is displayed as an equivalent stage of water in meters.
Stage, pore pressure, and rainfall for last hour
Stage, pore pressure, and rainfall for last 3 days
