As far as I know quarry lakes are created over time as rainwater fills the quarry over years. What keeps an open quarry from getting filled the same way when it rains?
Please tell me if the flair is wrong, I estimated this one to be the closest fitting.
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It’s not the rainwater that’s filling them usually. It’ll contribute sure, but imagine a parking lot after it rains, puddles evaporate.
Quarries are often filled back in with water because of groundwater permeation. Where I’m from, lots of quarries are built higher up into hillsides to help remediate this issue, but it will often require installing a large pump anyways to remove water that’s trickling in.
For a great example I recommend reading up on [the Berkeley Pit](https://en.wikipedia.org/wiki/Berkeley_Pit) over in Butte, MT. Open pit copper mine (quarry essentially) that filled back in with groundwater. Several very interesting environmental issues arose as the pit filled with water, it’s got a lot of interesting things about it.
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