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[Phynhas]

So I'm playing as humans, on a largish map (actually a wee bit bigger than the picture) so I have room to build above ground.

I was making modifications/repairs to the old worldgen road/bridge when the waterfall... "pit", I guess, started to flood slowly across the bridge.  It's a fairly chilly biome; it's late-spring and the water just now all thawed out.

Spoiler (click to show/hide)

It's not too bad now, but I'm not sure how serious it will get.  Do you think the stream emptying to the ocean is too narrow?  I considered raising that whole section of the road on pilings, but if it freezes while it's flooded, will it deconstruct the pilings?  I could wall the whole thing off and use it for farming, like a huge spillway running down to the beach.  It's still a temperate biome, so I'm hoping maybe some of it will evaporate off during the summer.

Edit: By pilings, I meant supports, but obviously, I could just construct walls.

I dunno though, never had this happen before.

[neblime]

wow thats pretty cool... but i expect the flooding will get to be problematic, especially if it reaches your front door!
Consider having a floodgate at the entrance you can shut at any time

[BlackFlyme]

I've seen this happen once before.

The river wasn't able to drain fast enough to contain the output from the waterfall.

It may evaporate in the Summer, if the flooding isn't faster than the evaporation rate. But if the supports are caught in ice when it freezes, they may be damaged or destroyed. Constructed floors and walls should be fine though.

If it ends up being a problem, you could build walls near where the flooding occurs to contain it.

[smurfingtonthethird]

Save me, please. That sounds like an awesome play, if laggy.

[Necrisha]

I had a river & waterfall flood like that. it was only 3 z levels deep, but the bottom would freeze and flood across the thawed portions of the map, snap freezing anything that ended up on the still frozen part of the map... It eventually killed all my dwarves due to inexperience and failing to setup on the upper levels

[misko27]

That, that's actually pretty cool.

[Bo-Rufus CMVII]

Interesting.

I'd start a levee to contain it, since it may be six months before you get a freeze.  As time, water, and ice allow, push the levee toward the stream, and let the resulting "canal" carry the water off the map.

[Sutremaine]

You could also dig drainage near where the flooding starts and have the water drain to a tunnel that leads to the edge of the map. Carve fortifications into the edge tiles, and you have infinite drainage.

[Koremu]

Or you could draw an extra adit off above the waterfall and install a series of power generating waterwheels. You're bound to need the power sooner or later, after all.

[Phynhas]

I'm gonna put a levee up for now, then I'll channel out the stream next winter.  I usually dam waterfalls right away but forgot this time.

I have a save right when the flooding began.  I'll put it on DFFD tonight after work.  The flooding is very slow, so there's time to do any number of things.

[PDF urist master]

when 1/7 water gets thawed out, does it turn into 7/7 water?

[krenshala]

when 1/7 water gets thawed out, does it turn into 7/7 water?

Yes, any level of water becomes 7/7 when it thaws again.  This is part of the reason the waterfall floods, in my experience.  The falling water tends to be in 1/7 to 3/7 chunks when it freezes, so at best it doubles the amount of falling water when it thaws.  It could give you seven times as much water in a worst case scenario (each 1/7 becomes a 7/7 at the thaw).

[Hurkyl]

Doesn't 1/7 freeze into an ice floor, rather than an ice wall?

[Phynhas]

Save me, please. That sounds like an awesome play, if laggy.

Hmm.... Okay, what's your second favorite upload site, after DFFD?  Doesn't seem to want to cooperate.