One explanation that I found was rainfall but it is not apparent that rainfall could contribute to such volume of water.
In: Geology
Groundwater will follow the path of least resistance, like a river will on the surface. Underground, this means following cracks and other spaces that can lead well above the actual water table. Some of these springs may disappear and reappear depending on actual groundwater levels, or disappear entirely due to an opening some distance away that allows the release of pressure within the groundwater system.
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