Egypt is planning to create a new delta on the left of the old one by building an artificial river that redirects agricultural waste water into the desert. The water should gradually turn the desert into land that's suitable for agriculture. Here's a video that explains the plan further.
This ambitious plan will cost around 9 billion euro's to complete. What I don't understand about it though is how simply redirecting water to a desert can turn it into arable land. The Egyptian desert consists of sandy soil and this soil type usually lacks the nutrients necessary for crops to grow. So how will this work?