| http://www.w3.org/ns/prov#value | - A water extraction system which protects water quality. ??? Storage tanks should have a maximum height of 2 m (unless additional reinforcement is used). ??? Organic materials such as bamboo and sisal fibres should not be used for the construction of water tanks. ??? Cylindrical or spherical tanks are stronger and more cost effective than cube shaped tanks. ??? Tanks should be sited to avoid risks
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