I currently have two large ponds filled with water to depth 7 that I need to get drained. Because I didn't think very hard about how liquid flow works, the out pipe on the one is one tile wide, controlled by a floodgate, and it's draining really slowly. The other one doesn't have an out pipe yet, but I had pretty much the same plan.
I'm thinking there must be a more efficient way to do this. Do I simply need a wider out-pipe? If so, can I connect multiple floodgates to one lever? (I'm favoring mechanical simplicity here.) Or is there an even better way? Assume that my pond isn't actually flooded, so a good pre-flooding setup will work too.
Here's a picture of the more interesting pond:
This one is directly below my trap-filled maze, hence all the ballista arrows, blood and corpses. I flooded it for a long siege which just finished up. The larger body of water to the north is the river, with its floodgate closed. The out pipe goes off to the west and ends at a floodgate (open) and a fortification (flooded). The tubes are weirdly shaped because that red ore is delicious hematite. And yes, my pond of death is adjacent to my bedroom area.