Modified pipe inlet

摘要: A pipe, such as a liner for repairing failing culvert, comprises continuous wall defining an inner surface and exterior surface. The pipe further defines central fluid passageway extending from inlet end to outlet end. of the waveform-like geometry near end, said including initial curvature beginning at continuing until reaching predetermined location where diameter is minimized, then with increasing again second location, before decreases third remains substantially constant along remaining length thus creating annular recess in pipe.