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Evapotranspiration: Pitfalls to Avoid and Why It’s Easier Than You Think

Mistakes that kill your estimates
Measuring evapotranspiration (ET) to understand water loss from a native or a managed ecosystem is easier than it looks, but you have to know what you’re doing. If you can’t spend the time or money on a full eddy-covariance system, you’ll have to be satisfied with making some assumptions using equations such as Penman-Monteith.

Like any model, the accuracy of the output depends on the quality of the inputs, but do you know what measurements are critical for success? Plus, as your instrumentation gets more inaccurate, the errors get larger. If you’re not careful, you can end up with no idea what’s happening to the water in your system.

Get the right number every time
You don’t have to be a meteorologist or need incredibly expensive equipment to measure ET effectively. In this 30-minute webinar, Campbell Scientific application scientist Dr. Dirk Baker and METER research scientist Dr. Colin Campbell team up to explain:

- The fundamentals of energy balance modeling to get ET
- Assumptions that can simplify sensor requirements
- What you must measure to get adequate ET estimates
- Assumptions and common pitfalls
- How accurate your equipment should be for good estimates
- Causes and implications of uncertainty

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