Monitor groundwater leaching, drainage and recharge
Use the Drain Gauge to determine the volume of water and chemicals draining from the vadose zone into groundwater. Once installed, water samples are easily collected through the surface port for analysis of chemicals, fertilizers, and other contaminants. The Drain Gauge is constructed from inert materials and will not react with compounds collected in the sample reservoir.
Accurately measure drainage
One challenge with lysimeter measurements is that water can flow around receptacles buried in the ground. To correct for this, our Drain Gauge uses an ingenious duct and wick design to keep soil tension in the soil column similar to that of the natural soil at the installation site.
Customize your drain gauge
Choose from a stainless steel or PVC divergence tube. Stainless steel is recommended for taking an intact soil monolith, but is not recommended for heavy metal testing.
For most applications, we recommend using the additional Drain Gauge Sensor to measure conductivity, temperature, depth, and to help determine when to empty the sample reservoir. For installation sites that are remote or have high drainage rates, we recommend using the AutoPump to take samples or empty the reservoir automatically. The sensor and AutoPump can be easily integrated with pre-installed units and are ideal for use with a cellular data logger.
Benefits
· Completely sealed system protects from high water tables
· 61 mm drainage capacity allows for large sampling volumes
· Can be used with the optional EC sensor to monitor solute fluxes
· Can be used with the optional AutoPump to automatically draw samples on remote or high drainage deployments
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· DIMENSIONS
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Total Length: 147 cm
DCT length: 63.5 cm
DCT (Inside) Diameter: 25.4 cm
Reservoir Length: 81.3 cm
Reservoir (outside) Diameter: 11.5 cm
Access Tube Length: 180 cm standard, customizable
Access Tube, Outside Diameteter: 6.0 cm (2″ schedule 40 PVC)
Sample Evacuation Tube: 1.27 cm OD X 0.79 cm ID X 3 m length; custom lenghts available upon request
Mass: 20 kg with Stainless Steel DCT, 14 kg with PVC DCT
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RANGE
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Drainage: 0-61 mm bottom of wick and 61-100 mm top of reservoir chamber
Water Depth: 0 to 3.5 m
Electrical Conductivity: 0 to 120 dS/m
Temperature: -11 to 49 °C
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RESOLUTION
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Drainage: 0.2 mm
Water Depth: 0.5 mm
Electrical Conductivity: 0.001 dS/m
Temperature: 0.1 °C
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ACCURACY
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Drainage: +1.4 mm
Water Depth: +0.1 % of full scale @ 20 °C
Electrical Conductivity: +0.01 dS/m or + 10 % (whichever is greater)
Temperature: +1 °C
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SUCTION AT INTAKE
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110 cm (11 kPa)
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SOLUTION COLLECTION CAPACITY
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3.1 L (6.1 cm of drainage) to bottom of wick. Additional 5.1 L (10 cm of drainage) of reserve capacity in wick chamber
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SOLUTION COLLECTION SURFACE AREA
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507 cm2 (25.4 cm inside diameter)
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WETTED MATERIAL
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DCT (standard): 304 Stainless Steel 11 gauge
DCT (optional intert material): PVC
Wick: dry fired fiberglass
Root Inhibitor: Treflan (BioBarrierTM), removable
Sample Evacuation Tube: Polyethylene
Hydraulic Bridge Material: Diatomaceous Earth (DE)
All Other Parts: PVC
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OPERATING TEMPERATURE
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0 to 50 °C (Pressure transducer cannot be allowed to freeze while submersed.)
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POWER REQUIREMENTS
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3.6 – 15 VDC, 0.03 mA quiescent, 0.5 mA during 300 ms measurement
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MEASUREMENT TIME
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300 ms (milliseconds)
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OUTPUT
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Serial TTL, 3.6 Volts Levels or SDI-12
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CONNECTOR TYPES
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3.5 mm (stereo) plug, or stripped & tinned lead wires (3)
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CABLE LENGTH
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10 m standard; custom lengths available upon request
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DATA LOGGER COMPATIBILITY (NOT EXCLUSIVE)
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METER EM50 Series, ProCheck, Campbell Scientific
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SOFTWARE COMPATIBILITY
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ECH2O Utility (rev 1.64+), DataTrac3 (rev 3.4+)
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COMPARISONS
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TECHNIQUE
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ACCURACY
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SPATIAL SCALE
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INSTALLATION/ MAINTENANCE
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COST
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COMMENTS
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PAN LYSIMETER
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Poor
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Medium – Large
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Low
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$
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Flux divergence under unsaturated conditions
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STATIC TENSION (WICK) LYSIMETER (I.E. DRAIN GAUGE)
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Fair
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Small – Medium
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Low
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$$
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Mid range accuracy, mid range cost
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CONTROLLED TENSION LYSIMETER
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Excellent
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Medium
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High
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$$$
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Minimal flux divergence/convergence issues; new turn-key systems with lower maintenance
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WEIGHING LYSIMETER
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Best
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Medium
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High
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$$$$$
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Quantify and manipulate hydrology
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