Wired has some pictures from Orange County’s (California) latest groundwater replenishment system. For $480M it converts 70M gallons of dirty water (sewage) into drinking water.
Western Water Crisis
Weird has another water story, also on the western parts of the US: Climate change is anticipated to severe the water crisis there.
Irrigation – but what crops
Another Weired story: not only how irrigation is done is important, also the crops play a role (who would have thought).