I want to know if this is scientifically possible in the real world.
When you take vast expanses of deserts (the sandy hot ones, not the icy ones) like the Sahara, life in general is restricted to near whatever small rivers or oasis/lakes there are or close to the oceans. But these places can become vastly different with just a bit of steady rain. Take India or mainland southeast Asia/ southern China for example which is on the same level as the Sahara from top to bottom on the map but is much greener and can sustain high population and produce lots of food and even rainforests similar to the amazon thanks to monsoons and tropical rainstorms.
The only way to make it rain is to get cloud systems to make their way into the Sahara, but as is evident this doesn't happen. So maybe a way to fix this is to bring massive quantites of water inland where they can evaporate away and then rain down somewhere else in the Sahara (which is HUGE so the rain clouds won't make it far enough to escape the desert).
This could be achieved by making massive, deep canals (dimensions can vary) that run through much of the interior of the Sahara (like the veins of a leaf) bringing Atlantic and Mediterranean water inland which evaporates in vast quantities and bringing more water in. Dams could be built to control flow and generate power. Endoheric basins could be expanded on or completely built from scratch to create inland seas like the Aral or Caspian. Rivers like the Congo which already have a high elevation and is second only to the amazon in the water it produces could be diverted easily from higher to lower elevations in the Sahara. Dams again could generate power for new settlements along the new river banks.
The salt which collects at the bottom could be a problem and block the canals but they could be mined away or made into building materials and coated to prevent water from dissolving them and this could be used to make at least a few small scale houses. Other industrial uses escape me but must exist. The threat of rising sea levels is non existent as these canals could be made deeper and narrower to prevent flooding. if built on a large enough scale it may even lower the sea levels worldwide. The lake chad basin alone is bigger than a quarter of the US and is mostly desert. Mining could make it deeper. The Massive amounts of materials generated could be used to reclaim new land from the ocean or build flood barriers like the Netherlands is doing.
Could this turn the Sahara green? Or at least make it more inhabitable?