Ever try to fill a pool? Pond? Lake? Reservoir, Whatever? Takes fooooorrrrever! How about a machine that you put at the level you want and you feed it say up to 40 slots of water and it slowly autofills your entire area until it either equals that elevation, or runs out of water (refill me lol). Only would fill YOUR lands…
REVERSE to remove water using same machine except it would obviously store the water.
Fuel machine could be coal or whatever…