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I have been thinking along these lines. Although I've used the GPS in my Polaris for altitude measurement, I have doubts about its accuracy based on simply driving around and observing. I obtained a much higher quality GPS unit and will spend time tomorrow driving around and taking some samples...

I considered pressurizing with an air compressor and listening for hissing and/or leaks, but it seems doing that is highly recommended. Something to do with making a bomb out of the pipe.

Somewhere, unknown, is a cracked or broken pipe compromising the pressure in my gravity irrigation system. The piping is 2 feet sub-grade, in well draining loamy soil, so water is not pooling anywhere on the surface. There are also some natural springs in the pastures. That is going to...