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Underground tank

1 byte removed, 19:36, 20 May 2013

→‎Design the tank

This is related to the above factor but ensure that the crops are hardened to withstand some stress during the dry spell. Determine how much area you would want to save in case of a very long dry spell lasting more than three weeks.<br>

'''5. Construction costs'''<br>

To save costs use as many available local materials as possible. Work in groups to share labour, as this is a labour intensive system. It takes approximately four for to ten people to construct a 10,000 litre tank.

====Materials required====

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