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[[Image:Plastic-lined_tank_icon.png|right]]
[[Image:Plastic-lined_tank.PNG|thumb|right|150px|In Nicaragua earth is used to construct open storage tanks ]]
A low cost alternative to metal or ferro-cement tanks for storing of water are plastic-lined tanks. Several models have been developed, for example:
Open storage tanks can be made of earth. If clay is not available, a plastic lining is needed to stop water from leaking away. Linings can be made of standard plastic sheet glued together with the tar normally used to repair roofs. The plastic must be covered with earth to prevent it from being exposed to the sun.
==History and social context==The [http://ideorg.org organisation IDE] in Asia is developing several models of plastic-lined tanks. [Imagehttp:Plastic//www.akvo.org/rsr/project/16/ Low cost rehabilitation of impluvia with PVC liner in Madagascar] by CRS and Practica, has very nice photographs of the process of installing these type of tanks. ==Suitable conditions ==Rainwater harvesting requires at least an annual rainfall of 100-lined_tank200 mm.PNG|thumb|right|150px|In Nicaragua earth is used Depending on the size of the design; the tank has a capacity of 1 500 to construct open storage tanks ]]10 000 liter.
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== Costs Manuals==
== Examples and initiatives External Links==* The [http://www.ideorg.org organisation IDE] in Asia is developing several models of plastic-lined tanks. * [http://www.akvoideorg.org/rsr/project/16/ Low cost rehabilitation of impluvia with PVC liner in Madagascar] by CRS and Practica, has very nice photographs of the process of installing these type of tanks.
* [http://www.practicafoundation.org www.practicafoundation.org ]
== External links Acknowledgements==[http://www.ideorg.org www.ideorg.org ]