Abstract
Fifty corrugated metal pipe (CMP) conduits in dams in the Midwest were inspected visually and evaluated to determine the overall condition of such conduits. Each was rated on aspects of joints, corrosion, lining, and their estimated remaining life (ERL) before repair or replacement was determined. The sum of ERL plus age at time of inspection yields the expected life (EL). Average EL was 43 years, but ranged from as low as 25 to beyond 65 years. Conditions of leakage at joints and the corrosion associated with this leakage was the aspect which most often limited EL. Relationships between environmental characteristics at the dams and EL were found to be weak. Water characteristics were found to be more important than soil characteristics. While visual inspection of the entire conduit is desirable, we found that qualitative evaluations of the condition of CMP conduits can be made without viewing the entire interior of the conduit to the degree provided by the visual inspection system.
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