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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Pumps for the most part.
Some quarries are high enough and have natural drainage to allow water to drain naturally but many others require full time pumping to keep them dry. Many will have a sump hole blasted deeper than the current working floor elevation to keep the water level below the floor.
Some smaller quarries I work in shut down over the winter and they allow them to fill up and when they start back up in the spring they fire large 6 inch pumps back up to drain them out again.
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