Thought about this a few months ago: We are seeing lots of flooding this year as well as a continuing drought on the left coast. Why cant we simply bring in tanker trucks (i.e. 18 wheelers), suck up all the damn flood water and haul it out west to give those Bubbas some relief? Seems like a win/win to me?? An I oversimplifying this or what??
Not could, would. Plus, just doing an eyeball estimate, there isn't enough rolling stock in existence world wide to move that much water fast enough to do any good for agriculture. One acre foot of precip is over 360,000 gallons; a LARGE over the road tanker can handle say 10,000 gallons. A rail tanker can handle 36K gallons more or less. Go with those numbers, and it's far better to wait out mother nature, sez me and maybe me only. That said, moving water into dry areas may well allow the population in place to wait it out for Momma's magic elixir to fall.
Not bad for an idea. Now all you need is pipelines. Knowing what we are dealing with permits for nat gas pipes in the roughly 100 mile range, have a blast with the thousand milers. Especially for intermittent 100 year storm services. I wish I had a good answer that was practical and readily doable.
Flood waters would likely be classified hazmat due to all the crap in it (sewage, misc. chemicals)...that would shut things down quickly even if the infrastructure was in place.