Water consumption for 100 ha crop

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i have seen quite large agricultural activities in the Saudi desert, probably fed by underground water reserves. 

Do you have a suggestions for the average water consumption kg/ha per month for such for the following crops:

a) wheat

b) alfalfa 

And would that be comparable (the water consumption) for areas in the Sahel zone, where crop could be farmed  if water would be available as needed?