Depth Sensors
A variety of pressure sensors, with varying accuraccies and sizes.
Staff Gages
USGS style A, C, E and M Reference gages.
Bubbler System
A gas is fed through a tube and bubbled freely into the stream
through an orifice at a fixed elevation in the stream. The gas pressure in the tube is equal to the
piezometric head on the bubble orifice at any gage height.
Float Recorder
A float-operated recorder provides a permanent, long-term graphic
 record of water-level fluctuations.
Data Logger
Recorders electronic data transmitted via pressure sensors, bubbler systems and float recorders