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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Most working quarries will be pumping out any water that collects within them.
This is done by creating a sump – have you ever noticed that quarries often seem to have a small pond right at the bottom? This is made on purpose so that any water that gets in to the quarry (through rain, groundwater, etc) will collect there where it is safe, rather than flooding the low point of any roads or structures. Once the water collects in this pond, we can just run a pump to shift the water away to a safe spot outside of the quarry where it can drain away safely.
Turn off the pump – such as once a quarry closes – and this water will no longer be pumped out, and the quarry will slowly fill up over time until it find an equilibrium – where enough water evaporates, drains out into the surrounding water table, or overtops and flows away as a stream and the level will stay fairly constant..
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