One explanation that I found was rainfall but it is not apparent that rainfall could contribute to such volume of water.
In: Geology
A spring comes out of the side of a mountain or hill (not at the very top). Rain falls down the upper part of the mountain and seeps in to the ground. But then it hits solid rock or layers of clay, that stop the water from seeping lower. The water starts to pool inside the earth, filling up all the tiny, empty spaces in the soil and rock. The pooled water level inside the earth eventually rises so high that there is a spot where it actually breaks the surface, which is where the spring forms.
Now, to get out, the water still has to pass through various layers of rock, soil, sand, and gravel. Sometimes the opening in the rock that allows the water out is only so big and only has so much capacity – so the water table inside the mountain just keeps on rising. The higher it goes above the opening, the more pressure there is, and the water will come out faster and at a higher volume, and a high water table also means that even drying dry spells, there is plenty of water still in the mountain to keep the spring flowing.
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