Can't believe we've missed this one...

[EternalOptimist]

but what happens when the floodgates are opened ? water flows downhill and you end up with a level surface

[Mich the Tester]

but what happens when the floodgates are opened ? water flows downhill and you end up with a level surface

Well, yes, possibly, if borders are opened unilaterally, but that isn't what I support.

[EternalOptimist]

one in, one out

i like it