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[Telok]

Explanation: Each floodgate is linked to one of the levers (top lever = righthand floodgate) and the bridge is on the cave river. I successfully flooded and drained this area in late summer of the first year, all normal. This is in the spring of the second year and has become a permanent flood inside that room. Normal method of activation is to just put one "Pull" job on each lever. Repeated opening and closing ofthe levers had no further effect, leaving the gates closed untill summer had no effect.

This is odd (to me anyways) because this is the setup I've used on the last twenty or so forts, up to seven or more years longevity on some of those forts. This has never happened to me before.

[Silveron]

I think it might have something to do with the pillars you have on the outside walls. Ive seen some odd things happen when the floods change directions. Do the tiles that are flooded change if you watch the room?

[Maximus]

You don't even need those outer pillars; 6 open spaces across is safe from cave-ins.

[Telok]

Hmm, it may be the pillars then. The flood washes back and forth in a nice sort of mandelbrot.

I'm also aware that I don't need the pillars for support inside the room. Those were mostly to remind me where the support pillars were going to go when I opened the area to later expansion. Besides, it looked nice.

[Toady One]

Yeah, this weird effect is known, and usually has something to do with a door or other structure closing on a flood.  I'll get to it when I can.

[bbb]

try sticking fortification on "inner" pillars?

[Maximus]

Fortifications still block dwarf-made floods, just not seasonal flooding.