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First, the top plate crashes the crack channel
Second, the bottom plate breakthrough channel
Third, the drilling channel 
Artificial water channel
Such passages are caused by unreasonable exploration or exploitation and should be eliminated.
Water-permeable cracks caused by caving mining, such as reaching the overlying water source, can cause the water source to rush into the wells and cause water inrush.
When there is an indirect water-filled layer under the floor of the roadway, under the action of groundwater pressure and mine pressure, the water-repellent layer of the floor will be destroyed, and an artificial fissure channel will be formed, resulting in water inrush from the lower high-pressure groundwater.
The mine bed, the lower aquifers or the surface water can be communicated during various exploration and drilling operations. If the drilling is poorly closed or not closed after the exploration, the water inrush will be caused when the drilling is exposed.