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.

Distributing control point used of straight closed traverse and using of distance measurement polar coordinates and near distance high degree level measuring method to do deformation measuring for the plugging water curtain wall.

With the technics of purdah infusion to stem water, surface sinking of large area can be prevented.

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.