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« on: July 06, 2012, 02:27:54 am »
Brooks, unique among the various river types, have a strange quasi-floor on top of them, which is why dwarves can walk over them without drowning nor even getting wet. As you've seen this floor can get muddy... it also blocks water wheel access to the water, and must be channeled away if you want to use the brook for that purpose. I doubt the brook is actually frozen.
Regarding the farm plot error message, ignore it. Error messages for farm plots in general are a bit weird and inaccurate, and the ones for above-ground plots are egregiously so. Just check back later on any plot location you're not sure of, see if it's being planted or not.
Exposing an underground tile to light and then roofing over it by constructing a floor on the level above does leave it lighted and above-ground. You can never grow underground crops there again, nor will you see volunteer cavern plants pop up there, but you can build above-ground crops there, and if you aren't quick about putting down the plots you might see surface grass and tree volunteers pop up.