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I have observed this for a number of cases. If I turned off weather, temperature, or embarked on a hot/scorching climate. Also, if you build anything over or on the floor of the murky pool it will not collect rain anymore. If you are continuously draining the pool it will not fill up either. You need to have it walled off so it can build up. Basically it needs to fill faster than the evaporation rate. |
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So, did you turn off weather? |
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I have similar issue, with more notes (happened on unmodified 08)
First I drained a pool for farming and while I handled other farming issues there was rain it filled up. This happened when the pond was "visible" on my screen, just on another z level.
Then I drained the pond again and begin doing other things somewhere else on the fortress, now only half of the pond was constantly "on screen" and that half of the lake got water while rain. The offscreen part of that lake remained dry - except for waterflow.
It seems that rain occurs only on the screen area, if lake is offscreen, then it will not fill. |
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Alternatively there shouldn't be a lake/pond in some of these hot areas at all. |
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