Here's an engineering megaproject for you--flood the Qatarra Depression (which covers ca. 18,000 km2) with water from the Med. It would provide a large inland sea in the north of Egypt, and sea-surface evaporation would significantly influence the climate of the local area. It would alsdo provide an enormous surrounding area of potential farmland for people to grow crops. A canal could be cut towards the northern coast; and obviously they don't want to cut the northern coastal route westward, so the channel would have to be covered, which would also act to slow down evaporation as the water flows into the new sea.