Sewage inspection wells is a mould used for laying in bed at the
bottom, flat cement brick bottom area drains ditch, the six corners of
the shape of the design is to strengthen the close combination of each
slope protection brick, docking and edges and can also form a three
angle of good posture, such support to be equally good, from the surface
to ensure that each will have the same pressure at the bottom of a
river is the flow of water through the plane, slope protection bricks
can play a very good sealing effect.