One explanation that I found was rainfall but it is not apparent that rainfall could contribute to such volume of water.
In: Geology
Rock can be like a sponge, with holes in it that fill with water, but it can also be solid and fracture. Fracture lines or fault lines can go up/down from the top of a hill to a lower point underground where there is a lot of water. If that water is has limited space in the rock, but more water drains down into that space, then the pressure of being squeezed in a too-small space can push the water up the fractures and fault lines, because they are weak points in the rock. And then at the top, you have a spring pushing water up and out with surprising amounts of force and volume.
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