First, the surface is drained. Drilling in the aquifer on the surface, and pumping water from the mutually communicating holes to the surface with a deep well pump or submersible pump, so that the mining section is above the surface of the dredged falling funnel to achieve safe production.
Second, the underground is drained. When the groundwater source is deep or the water volume is large, the method of downhole drying can achieve better results. According to different types of groundwater, there are methods for draining old pore water and draining aquifer water.
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