In the face of water scarcity, Americans are turning to an ancient technique -- rainwater harvesting -- and cities across the US are encouraging them to do so by subsidizing the costs of tank installation. Since Tucson, Arizona, started its rainwater harvesting rebate program in 2012, after a decade of drought, more than 80 million gallons of rainwater have been collected. After the 2002 drought in New Mexico, when parks were no longer irrigated, the Santa Fe High School baseball coach asked for the district's first rainwater harvesting cistern. In St. Louis, rainwater harvesting is stopping flooding when storms overwhelm its sewer system, while also irrigating a garden and orchard at Jubilee Community Church.

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