It is in the water cycle true, but where it is in that cycle and where it ends up are both critical to our long term industrial agricultural water use.

Our water (in the US) comes from aquifers and like the proverbial milk shake, we're drinking it all up and pouring it on alfalfa.

We need far far more water than collecting it from the rain would provide.

The coming water wars will be fought over the rights to the dwindling supplies...