Actually Ern, that is a good point - thanks for the perspective. I'm used to very urban environments where the water never sees the light of day again until it hits the sea. But obviously that is not always the case, so yes- proper research is needed.
In fact, the entire country's philosophy on water needs a major reevaluation. Countries such as Israel don't spray their crops anymore - wastes too much water. They are expert at drip irrigation systems for crops, and we have similar needs here - we need to get away from old water management practices.