Brook

From DwarfFortressWiki

A brook is a small river that creatures and wagons can travel across without swimming. The top of the brook shows running water as long as there is water in the tile below; if the brook is dammed or otherwise drained, a dry streambed character (similar in appearance to a boulder, but not blocking wagons) will appear instead. The top of a brook acts like a floor grate most of the time: fluids, such as magma and water itself, will fall through it, and it can be fished through as well. However, releasing water over the surface of a brook will cause the brook to become muddy, and capable of being farmed on.

Water wheels will not function if placed directly on a brook. In order to get water wheels to work, you must dig a channel through the surface of the brook, which removes the floor tiles, making that part a normal river. After damming the brook you can mine out the brook tile to produce one stone. This can provide an important source of stone in maps which contain aquifers with the brook itself providing the motive force for draining the aquifer, and the stone supplying the much needed mechanisms.

Overworld
World generation - Regions - Biomes - Civilizations - Map legend - Sites - Armies
Aquifer - Brook - Cave - Chasm - Forest - Island - Lake - Mountain - Ocean - Pit - River - Tunnel - Volcano - Waterfall