How does a rivers source constantly have water.
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Try a little experiment:
Set up a little sprinkler so that it’s “raining” on some ground higher than some other ground. Depending on whether the water easily seeps into the earth or not, it will begin to collect in what we would call a drainage basin. Because of gravity, the drainage will move down hill through the path of least resistance. As long as there is a sprinkler (read: rain) recharging the higher elevation with water, that water will need to get downhill to find the ocean. We call these drainage paths streams. If we have extreme drought the rivers will quite literally run dry.
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