Groundwater flows extremely slowly (meters/day) by Darcy's law; one and the same layer feeds springs and wells — and if it meets magma it erupts into a geyser.
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Adjust Rain / Pump / Heat & pick a "Scenario" (pumping/artesian/geyser/contamination…) on the right · click a layer / concept for details
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Water table & dischargewater leveldischarge/eruption