Use the Drain Gauge to determine the volume of water and chemicals draining from the vadose zone into groundwater.
The one-and-a-half meter tall Drain Gauge is buried directly in the ground to measure flow rate in unsaturated soils and collect soil water samples for chemical analysis. Water samples can be collected easily through a surface port to analyze for chemicals, fertilizers, and other contaminants.
One of the challenges with lysimeter measurements is that water tends to flow around receptacles buried in the ground. The drain gauge uses an ingenious duct and wick design to apply a constant tension and keep the flow rate within the drain gauge equivalent to the flow rate in the surrounding soil.
The Drain Gauge G3 is constructed from inert materials, so chemicals won't react with the tube, the sensors, or the collection reservoir.
The Drain Gauge G3 has two available materials for the divergence control tube:
The Drain Gauge G3 can be used with or without the electronic sensor.
|Total Height:||125.5 cm|
|Measurement Time:||10 ms (milliseconds)|
|DCT Diameter:||25.4 cm|
|Drainage Resolution:||± 0.1 mm|
|Operating Temperature:||0 to 50°C|
|Weight:||10 kg (22 lbs.)|
|Compatible Dataloggers:||Em50 series, all CSI loggers|
|Wick Tube Length:||1 m (3 ft)|
|Sample Collection Reservoir Volume||3 L|
||mV, proportional to water level, scales with excitation voltage|
|Wick Material:||60 cm inert fiberglass|
|Divergence Control Tube (DCT) Length:||66 cm|
|Power Requirements:||2.5 - 5 VDC @ 3 mA, for 10 ms|
|Construction Material:||Stainless steel DCT, inert polyethylene wick, PVC reservoir chamber|
|Technique||Accuracy||Spatial scale||Installation/ Maintenance||Cost||Comments|
|Pan Lysimeter||Poor||Medium - Large||Low||$||Flux divergence under unsaturated conditions|
|Static Tension (wick) Lysimeter (i.e. Drain Gauge)||Fair||Small - Medium||Low||$$||Mid range accuracy, mid range cost|
|Controlled Tension Lysimeter||Excellent||Medium||High||$$$||Minimal flux divergence/convergence issues; new turn-key systems with lower maintenance|
|Weighing Lysimeter||Best||Medium||High||$$$$$||Quantify and manipulate hydrology|
Phone: 800-755-2751 or