The US desert city where I live – Tucson, Arizona – receives just 304 mm of rain on average each year. That’s nearly half the amount of rain that falls on Australia’s driest city, Adelaide. Like many communities around the world, Tucson fails to see the rain as an asset, letting rainwater run off into storm drains and sewers, while pulling from the water table faster than nature can replenish it. In Australia, this practice has resulted in water restrictions in major cities and depletions of the water table as severe as 80 per cent in many areas. In Tucson, the same practice has dried up countless springs and wells, along with the Santa Cruz River, which once ran perennially through the west side of town.
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