Method of precipitation:

1. Large Bore Jet Well Method: Mainly involves drilling large bore wells within the water lowering area, installing filter pipes and deep well pumps, and pumping groundwater to the surface. The large bore jet well method covers a broader area due to its larger well pipe diameter and the installation of a deep well pump in each well bore.

2. Open Ditch Drainage Method; Open ditch drainage is a simple, relatively economical and quick method of water drainage. It involves excavating an open ditch on both sides of the pipe trench, with the bottom elevation of the open ditch lower than that of the pipe trench, and a sedimentation well is set up.

Application Range:

1. Layers of sand and gravel, or silt with high groundwater levels. For weakly permeable clayey soil layers, measures such as electric well points, deep well points, or combined dewatering can be taken to lower the groundwater level.

2. Measures are in place to control ground subsidence near the site within permissible limits.

3. The surrounding environment allows for some ground settlement.

4. Possesses mature regional experience, proving that precipitation has no significant impact on the surrounding environment.

5. The water stop diaphragm is sealed, so when precipitation occurs within the pit, the water level outside the pit does not drop significantly.