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Harvesting rainwater has long been the norm in rural areas that reticulated water doesn’t reach, yet it’s still not common in New Zealand’s urban areas. We lag far behind Australia, where drought and pressure on water supply are motivating changes in household water use and government subsidies for rainwater collection. More than half of Adelaide households have rainwater tanks for example. There’s a lot to consider about how you harvest rainwater. But for urban households already connected to reticulated water, first you need to consider why you might do that. Water security Your family needs water to survive an emergency....