One further note:  In order ...

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One further note:  In order to give you a continuous supply of water for your growing population , you will need a very large reservoir or lake as a source.  One hectare-Meter of water will last about 3.37 days at the maximum usage rate.  So for a year's supply you will need something with a volume of about 115 ha at a depth of at least 2 meters or more.  You work out the cubic volume but plan for 25% evaporation losses during dry season from a reservoir.