Concave convex drainage board has a good drainage system of the civil construction period and normal use of structure in playing an important role. Drain and porous tubes has an effective drain drainage system, cylindrical long-short drainage plate and geotextiles is composed of a drainage system, thus forming the function of water seepage, water storage and drainage system.

Concave convex drainage board has a good drainage system of the civil construction period and normal use of structure in playing an important role. Drain and porous tubes has an effective drain drainage system, cylindrical long-short drainage plate and geotextiles is composed of a drainage system, thus forming the function of water seepage, water storage and drainage system.