Its crazy how much water can be collected from run off and reused. I have some farmer friends in western Manitoba who went together and built a 60 million gallon water reservoir, and in this spring they diverted some run off water from JUST ditches (not creeks, rivers, etc), and filled it in 2 weeks with the snow melt and water run off through the ditches. Its not clean, and its not drinking water, and they still need to clean it, but it gives them 3 year supply for other stuff. Up till now them were paying $300k per year to the local township for all their water, now they just need to buy drinking water.
But they don't live in a desert, and a lot of the problems with California seem to come from trying to grow stuff in a desert area.
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