Our cities will need to harvest stormwater in an affordable and green way – here's how

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When it rains, stormwater runs down surfaces like streets and parking lots and into drains. Most of the time, we see it as a problem because it can cause floods. Recent storms across eastern Australia created huge amounts of stormwater and flooding.

At such times, stormwater is seen as a problem. But it’s also the last untapped source of water available for cities.