PVC channel-type roof-roof,waterproof directional water storage and drainage system
is composed of arch-type storage-drainage board,ditch,closed slots near wall and waterproof
protection strip of garage edge. After pavement, the networked ditches are formed on the surface
of underground garage and it is a directional water storage and drainage system with the auxiliary
function of water resistance and roof separation.

Big water storage hole with round stiffener is designed on the PVC arch-type storage-drainage board.
It’s water storage capacity reaches 5 liters per square meter.big flat surface with four round stiffeners
is adopted on every point. All of these designs improve compressive strength and impact-resistance strength of the system.