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[Ariosto]

I have a number of waterfalls, at the present four, which I have cascading down through a series of grates in the Residential area(s) into a sewer, which is then supposed to offload the water through fortifications on the side of the map. Unfortunately, for reasons I can't understand, the water is not "running" down the sewer fast enough, to the point that it is backing up into the first residential layer. The waterfalls themselves are only coming down in single columns, minus a central pillar on the third level that allows the water to run along all its sides, then through the grates into a cistern, which itself drains by a slope into a sewer line.

The plan, besides making use of waterfalls to both clean and provide happiness for the dwarves, was also to provide a constant supply of clean fresh water through the grates on the lowest residential block, and I'm worried now I might not be able to do that now.

Any ideas how I could fix this?

[anewaname]

Without seeing the map, I would guess your sewer isn't letting water off the map fast enough because you have too few fortifications at the end, and adding more fortifications at the end will solve the problem.

Fortifications on the edge of the map do not allow "water pressure teleportion" to teleport water off the map, it just flows out about 3/7 per movement. If your four waterfalls add more than the outlet can accept, it backs up. I usually make a 1-wide sewer tunnel and put three fortifications at the end since water can flow diagonally through them.