exemplary dimensions of a greater variety of pipe sizes it is to be understood that these pipe dimensions are merely exemplary and that the present invention contemplates pipe having a wide variety of dimensions fig4 illustrates a cross section of a sidewall section of another exemplary embodiment of the present invention similar to the previous embodiment the section of pipe wall 400 preferably includes a smooth inner wall 410 and a corrugated outer wall 420 the corrugated outer wall 420 includes corrugation crests 430 and corrugation valleys 440 on top of the corrugated outer wall 420 is an outer layer 450 of the pipe wall 400 that includes convex sections 460 and concave sections 470 the concave sections 470 of the outer layer 450 are generally aligned not with adjacent corrugation crests as in the previous embodiment but rather with every other corrugation crest 430 indeed the present invention contemplates the convex portion of the outer layer spanning any number of corrugation crests the pipe dimensions of the embodiment illustrated in fig4 may be similar to or the same as the dimensions set forth above the corrugated pipe of the present invention achieves reduced installation sensitivity due to an increased moment of inertia i e stiffness of the pipe wall that translates into increased resistance to deformation bending in addition because the outer layer 350 450 is smoother or less non linear.