any more development in the fast-growing city must rely on other sources of water -- such as under-strain rivers. BestPlaces.net tells me Phoenix averages 9 in

any more development in the fast-growing city must rely on other sources of water -- such as under-strain rivers. BestPlaces.net tells me Phoenix averages 9 inches of rain annually and another site (below) suggests rainfall varies from 3.3 inches to more than 21 inches across the state. https://www.currentresults.com/Weather/Arizona/yearly-average-precipitation.php https://www.currentresults.com/Weather/Arizona/yearly-averag... My recollection is that off-grid Earth Ships only need 10 inches of rainfall to have adequate water supply using catchment systems and relying on gray water for things like irrigation. Fresno, California has a rich history with regards to water development and has increased groundwater levels in some years. Anyone working in this area or interested in this issue should look up the book about that history. I believe it's called "Water for a thirsty land" and has some subtitle. (I've said this before and linked it before.)