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[slothen]

on a serious note, while you cant flood the entire map,
1) try building a 20 Zlevel high cistern, with a floodgate wall at the bottom pointing out from your entrance hall towards a nice pit with good drainage.
2) open it when invaders come and laugh at the miracle of pressurized water.

I did something similar with an underground tunnel.  Managed to flood my pit and drown the invaders instead of knocking them off.  In your suggestion, the water would flood the entrance way so fast that it would stop pushing them, and invaders would drown, or path back toward the pit to escape, and only get knocked off once they reached the edge of the pit.

If you want a controlled flow of water (7776665544333321  instead of 777777777763 )  I would suggest using a cistern that keeps 7/7 water behind diagonal baffles.  If the water isn't training from the baffles fast enough, you can add more, but subsequently keep the width of the path of the water narrowed down.  (5 diagonal baffles leading to a 3-wide corridor).

[bombzero]

i do 15 unrestricted floodgates leading to a 3 wide corrider, it pushes them, trust me.

[Ross Vernal]

Essentially, you can sustain 1 edge tile drenched in water for every lake or river that intakes from the map edge.  Unless you're on an ocean and causing a tide, I don't think you'll find enough water entering your map to sustain a flood.

For every lake, or for every lake tile that is an edge input? If it's per lake, then no, I am totally hosed. If it's per tile, then it may be more of a possibility.

At least I can cast the world in obsidian!