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Underground tank

37 bytes removed, 23:43, 8 November 2012
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[[Image:Underground_tank_icon.png|right]]
[[Image:Underground_tank.PNG|thumb|right|300px|Underground storage of rainwater in Bolivia. Photo: Netherlands Water Project.]]
Where access to groundwater is limited, [[Rainwater harvesting|rainwater harvesting]] in underground tanks can be an effective and low-cost alternative. Water stored in the wet season can be used in the dry season and lifted from the tank with a [[rope pump]] or with a [[Deep well pump|deep well pump]], which can elevate water up to 30 m.
These tanks can be constructed of concrete blocks or with other materials. The tanks are partly (1.5 m) built below the soil surface. These tanks can store up to 20,000 liters of water, used for domestic use and crop cultivation.
==Suitable conditions ==
The area should be suitable for [[rooftop rainwater harvesting]]. Depending on the design the capacity of the tank varies from 3,500 to 20,000 liters.
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