eli5: Why does there continue to be water in a river, even though it doesn’t rain all the time in the upper parts?

Question

eli5: Why does there continue to be water in a river, even though it doesn’t rain all the time in the upper parts?

In: 29

Answer 1

I think about this every time i see a creek in the summer, it seems so mysterious. But notice that creeks and rivers are always cut into the ground. They are lower than the soil above, and sometimes just that few feet is enough for ground water to seep into the creeks and streams and feed them.

But that doesn’t meant it never stops. In dry summers lots of waterways do dry up.