Deep mines that flood with rain

If a mine is lower than the surrounding land, it floods when it rains and it is necessary to use pumps to keep it free of water. The thing can be extended and there are already dry lakes or with fresh water springs that form lakes and rivers. The course of the rivers could obviously be changed through excavations. At the same time a "salt lake" that is a portion of the ocean surrounded by emerged earth, if pumped would see the water level drop until it dries up.