How are some man-made lakes so deep? And where does the water come from and how can that much water be transported? It seems impossible to me that we can fill lakes that are 250+ feet deep.
In: Engineering
The key is the [drainage basin](https://en.wikipedia.org/wiki/Drainage_basin), or catchment area. The water comes from the rain but it’s not just the rain that falls into the lake itself but the water that falls onto the land around that is sloped towards the lake. So all the rain that falls on the valley sides will flow in to form the lake.
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