ASDSO Dam Safety Toolbox

Deterioration at Invert is Hard to Detect

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Message: The invert of a pipe is difficult to see and subject to increased corrosion.


This bituminous coated CMP showed only moderate deterioration in conduit. However, the connections between sections of the pipe and between the pipe and the tower were severely corroded. In addition, the coating at the invert of the pipe was gone and corrosion was beginning. Removal and replacement was needed.

  • 1998: Beginning signs of corrosion on CMP

    1998: Beginning signs of corrosion on CMP

  • 2008: Loss of bituminous coating below springline

    2008: Loss of bituminous coating below springline

  • Following removal in 2013: Loss of bituminous and corrosion along pipe invert

    Following removal in 2013: Loss of bituminous and corrosion along pipe invert


Note: The content on this page was originally created as part of DamOutletWorks.org (DOWL, 2018). It has subsequently been updated and reformatted as part of the Dam Safety Toolbox.
Revision ID: 3133
Revision Date: 09/15/2022

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