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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Some quarries have water seeping in or out, but most have pumps.
As the quarries get deeper, they have to pump part way up and then use another pump to get all the way up.
Some big open pit mines/quarries actually drill wells around the outside of the pit, and use pumps to lower the water table in the ground before it seeps into the pit. They do it this way because the water that comes out is clean groundwater, so it can be pumped to a nearby river or lake. If they pump the water out of the pit, it is considered dirty and has to go to a settling pond before it can go into the environment in
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