The Drain Gauge G3 allows you to deploy multiple units to cover a large area at an affordable cost. It’s an incredibly easy-to-use lysimeter that provides dependable monitoring of leaching, drainage, and recharge without the complexity of larger systems. This means you can instrument entire agricultural fields to better quantify variability. The G3 was deliberately engineered to be installed below the plow layer, so growers can perform normal operations directly over the instrument, which eliminates problems like edge effects. Plus, the Drain Gauge G3 can be combined with METER soil moisture sensors and precipitation gauges to estimate the total water balance more accurately than methods which only guess at deep drainage as a residual.
The Drain Gauge G3 is a passive-capillary lysimeter that determines the volume of water and chemicals draining from the root zone into groundwater. Once installed below the root zone, water samples are easily collected through the surface port for analysis of chemicals, fertilizers, and other contaminants. Not only is the Drain Gauge constructed from inert materials so it won’t react with compounds collected in the sample reservoir, it also features a sealed design, which allows it to work in both saturated and unsaturated conditions.
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One challenge with lysimeter measurements is that water can flow around receptacles buried in the ground. Unlike traditional pan lysimeters, the G3 corrects for this problem by using an innovative duct and wick design to keep soil tension in the soil column similar to that of the natural soil at the installation site. After installation, the G3 is practically effortless. It requires almost no power and no maintenance other than periodically pulling samples.
Engineered to fit your needs
The Drain Gauge is designed to be flexible to fit your unique application. A stainless steel or PVC divergence control tube holds the soil monolith. Stainless steel is recommended for taking an intact soil monolith, and PVC is recommended for conditions where heavy metals are leaching.
For most applications, we recommend using the add-on Drain Gauge Sensor to measure conductivity, temperature, and depth of the collected sample and to help determine when to empty the sample reservoir. The sensor also provides time-series drainage data, enabling you to correlate drainage with irrigation, fertilization, or other events. For installation sites that are remote or have high drainage rates, use the G3 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 our new ZL6 data logger.
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