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[[Image:Underground_tank_icon.png|right]]
Where access to groundwater is limited, rainwater harvesting in underground tanks can be an effective and low-cost solution. Water stored in the rainy season can be used in the dry season and lifted from the tank with a rope pump or with a FlexiEmas pump (see PVC pumps), which can elevate water up to 30 m. The government, with support from organisations such as UNICEF and IRCSA (International Rainwater Catchment Systems Association) started a programme to construct one million rainwatertanks in Brazil. Practica foundation is testing various options for low-cost storage and groundwater recharge like the "Reed cement tank" and the "Tube recharge"
[[Image:Underground_tank.PNG|thumb|right|150px|Underground storage of rainwater in Bolivia ]]