The border of water block curtain, water block depth, water block materials were determined after scientific analyses on hydrology and geology condition and some geophysical survey.

The constructed wetland wastewater treatment method can not only remove pollutants such as organic compounds, nitrogen and phosphorus, but also can control the damage of seawater intrusion by forming fresh water barrier, which realizes the integrated utilization of gray-water and the eco-renovation of coastal ecosystem.

Existing several projects show that fresh water barrier can be effectively used to prevent sea water intrusion and protect aquifer.

The application of single-row pile combined with water-resisting curtain in deep excavation work;

The application of high-pressure rotating water-resisting curtain under complex sea-frontl geological conditions;

The application of soil nailing and water-resisting curtain in deep foundation pit supporting;

5m, including sloping excavation, mesh and shotcrete on the slope, pressure-spraying mortar into riprap layer to form water-stop curtain and etc.

Single-pipe revolving spray technique was used to treat the foundation of multi-conduits in the construction of water-stop curtain work of the right abutment at Beijing Sanjiadian Reservoir.

The retaining and protecting piles, curtain for cutting off water, dewatering, recharging and shotcrete-anchor retaining are integrated the systematic constrction technology; and it successfully used in a deep excavation engineering, of which the depth is 13m and the groundwater is at -1.

The curtain for cutting off water in well point recharging system is to complement water when it is dropped in foundation pit by using water returning to the well.