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Underground tank

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'''4. Daily usage'''<br>

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 as shown below. Work in groups to share labour, as this is a labour intensive system. It takes approximately fours for ten people to construct a 10,000 litre tank.

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