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Concrete pipe is a rigid pipe that has significant structural strength.
The load carrying capacity of this rigid pipe when installed is increased by at least two-fold because of active soil pressure. Furthermore, concrete pipe's structural strength can be adjusted through several means, most notably by varying the wall thickness, concrete strength, or the amount and shape of the reinforcing steel. Installation using concrete pipe should be considered as a pipe-soil structure. Because the structural integrity is derived primarily from the pipe, moderate changes to the soil envelope over time will not compromise the structural integrity. HDPE is a flexible pipe which relies upon pipe stiffness, rather than strength, for its structural integrity.