

Although important topic - many regions already suffer from acute water shortage, at least for half of the year - global aggregate numbers don’t mean so much, as large-scale inter-regional water transport isn’t practical. There are a few exceptions - China has it’s N-S water transfer project, there’s potential for a canal from Congo to Chad. Transfer by evapotranspiration is big, but not really planned. There’s also water (and energy) embedded in food, could be reduced if people care. Anyway what’s new (not this article)?
There’s still thin snow on the high mountains to the NE (checking nasa worldview). Where the main river emerges from them is about 200m lower than Kabul city, but it must be possible to pump some up that much, and bring it thence (about 70km) with a pipe or canal. Probably chinese will do it, maybe bringing stuff via Wakhan, if nobody else helps.
Edit - zooming on opentopomap I see traces of part of such a canal, but it doesn’t get as far (or as high) as Kabul.