Water Wells 1.) Why do some run dry? 2.) Is rainwater what fills them up? 3.) If so, why isn’t the water dirty from the…ya know, DIRT?
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Water will filter through just about anything, including a lot of rocks. So you dig your well down into rock, and you get water that’s filtered through the rock. And yeah, it’s just rainwater that’s filtered through dirt and then rocks. There’s a lot of water underground that’s been there for hundreds of thousands of years because it’s not evaporating.
When you use groundwater, for instance from a well, the water level in the surrounding rock goes down, forming a cone shape as water slowly moves back into the rock around your well. If your neighbor has a deeper well, and uses enough water, then their cone will engulf your well, and you won’t get any water. And if you’re drawing water from an ancient aquifer, we’re probably drawing water a lot faster than its being replenished, meaning the water level just keeps going down over time.
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