Storage-type water harvesting systems consist of a cistern or tank, along with a delivery system for the water. Storing lots of water comes with a responsibility to prevent it from becoming a problem. So check for sediment periodically, and clean the bottom of the tank as needed. Maintain critter-exclusion devices to keep mosquitoes and other vermin from coming to live in the system. Keep lids and access ports locked so nobody gets inside and drowns.
Keep in mind that tanks can eventually leak or even fail catastrophically. Inspect them at least once a year for leaks, rust spots (metal tanks), cracks (ferrocement or masonry tanks), undermining of the tank foundations, or any other signs of failure. Be sure to check all components after an earthquake.
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