The sheer volume of water that moves through even a small creek is shockingly massive.

The amount of water held in an aquifer is astounding.

The soils required for agriculture and general growing plants (ones that hold water and nutriet) specifically are lacking or depleted in deserts.

So… it’s a literal pipe dream.

You’re wrong about the soil nutrient content in deserts. Or at least it’s not a blanket statement like that since some deserts are essential in providing soil nutrients to other parts of the world through wind.