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 Great Man-Made River - Wikipedia 

*Update:  So how about this lake Ptolemy?  If this was a monsoon area, what stopped the monsoon.  The plot thickens with the soil..

Nice work.  Rather than a pump project, to pull from deep underground, why not try collapsing the soil through the water and create a giant lake?  The water being tapped is not forever, unless the ocean is being filtered into this basin.  From what i understand, the water is a finite supply.  drain it with well fields, and you may pull salt water, or worse, run out when it gets to support a larger population.  This is also causing massive trash with the piping, wells, motors, fuel, its all waste.   make a river off a big lake that heads through to a giant reservoir in your country.  The rivers would cause plants and animals, and that is what builds a canopy, and that is what holds moisture, and that is what creates never ending rain.  

My fear is that changing morocco or Saudi Arabia could throw off the Jetstream for the Congo.  If we alter the flow, we need to ensure it comes back around to feed the flow across the Atlantic.  the way it circles off the Mediterranean southward makes Libya a nice spot to start.  I think some Italians had homes there... ;)