Ok, 12-feet it is. How tall are the tanks, and to how far from the top do you fill 'em? Next time you're out, please take a tape rule and your digital camera. I've already started on drawings, but have /zip/ experience with cattle operations.
I have historical weather data from NREL (National Renewable Energy Labs,
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), but need to know more about less scientific stuff like portability and what would make for ease of deployment and how to build something that won't be done in by curious/bored critters. :)