Specific analysis of the specific situation! This depends on the local groundwater level, that is, the elevation of the diving surface! The distance between the diving surface and the surface determines that "in some places, there is groundwater when you dig two or three meters, and in some places, there is groundwater when you dig more than ten meters".

At the same time, this distance is also related to the local dry season or rainy season; Or related to groundwater recharge, and so on! These are all determined by specific circumstances!

Specific analysis of the specific situation! It depends on the local groundwater situation!