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[JTTCOTE1]

I'm trying to create a castle type fort. I got literally the best embark in the history of embarks for that purpose - two streams form a Y shape, with the section between the two streams being elevated. However, it's only elevated above one of the streams - the other is at the same level as my fort. It's a temperate area, so in winter that stream freezes over and goblins can cross. How can I lower the water level so that it's a level below me?

If I wait for winter, set up a wall where the ice is near the start, then channel out the ice and the level below, will this cause the stream to be a level lower on the other side of the wall?

[joeclark77]

I'm trying to create a castle type fort. I got literally the best embark in the history of embarks for that purpose - two streams form a Y shape, with the section between the two streams being elevated. However, it's only elevated above one of the streams - the other is at the same level as my fort. It's a temperate area, so in winter that stream freezes over and goblins can cross. How can I lower the water level so that it's a level below me?

If I wait for winter, set up a wall where the ice is near the start, then channel out the ice and the level below, will this cause the stream to be a level lower on the other side of the wall?

Yes.

[Raphite1]

Remember to leave a way for the water to flow off the map; this is an issue since you won't be able to channel out the very last map-edge tile where the stream exits.

However, if the edge tile is rock, you can carve a fortification in it, which will let the stream flow out. So, consider lowering the end of the stream all the way down to a rock layer.

[joeclark77]

He's already got a waterfall, he's just going to lower the top of the waterfall by one z-level.  It should drain out the same way it already does.

[Xinael]

If it was me if just build a wall along the stream and make the goblins walk round to invade. You see this sort of design all the time in real castles - check out this pic of Warwick castle, for example.

[slothen]

I would wait for winter, then you can channel out the ice of the frozen stream, and lower the riverbed by 1 level.  You'll need to probably modify the place where the stream flows out to avoid problems as well.

If it was me if just build a wall along the stream and make the goblins walk round to invade. You see this sort of design all the time in real castles - check out this pic of Warwick castle, for example.

Because the water makes that side the most defensible, all of the staterooms and living quarters are facing it.