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40d:Evaporation
Evaporation in DF occurs when liquids (water or magma) are very shallow. Also, outdoors, water can evaporate when the outdoor environment is very hot.
If a tile has either water and magma at a depth of 1 (also referred to as 1/7) for too long, that liquid will slowly disappear. (A tile of depth 1/7 fluid resting on a full 7/7 water tile below it will also evaporate in this fashion.) Magma will evaporate more slowly than water will, but also flows more slowly - this can also slow or even prevent long diversions of liquids, as at some extreme point the flow and the evaporation occur at the same rate. A solution is to install floodgates or other barriers at regular intervals, allow that section of the passage to fill, and then move on to the fill the next section.
Outdoor water of any depth will evaporate (and possibly disappear completely) during hot or dry seasons. Outdoors, deeper water seems to lose water at a slower rate; over a couple of seasons, a depth 2 pool has been observed to vanish completely while a depth 5 pool didn't lose any water at all.