Twin Culvert Invert Lining

Project Overview

Two 72-inch diameter corrugated metal (CMP) culverts in Greenville, Alabama, had sections at the invert that had rusted through. The cost to cut open then replace the culvert was prohibitive. However, this culvert could not be left alone without further degradation, which could jeopardize the overlying roadway.

Pipe sections had been added over the years as the road was widened and the culvert now consisted of three 20-foot sections, for a total length of 60 feet. The center section was the oldest and in the greatest need of repair, so full excavation and closure of the road was the conventional option. This option would have required closing the road for a minimum of several weeks at a cost of at least $100,000.


1) Internally spraying an inner lining, costing up to $1,000 per linear foot

2) Excavation and replacement of the culverts costing at least $100,000

3) Using Combat Concrete GCCM as a protection liner by arranging panels in a shingle pattern within the culvert, at an estimated cost of ~$100 per linear foot.

The county engineer decided to use Combat Concrete GCCM in this trial application, because the product is easy to install, the project was expected to take less than one day, the installation would not require excavation, and the total project cost was expected to be very competitive.


Project cost for this size culvert and length was approximately $100/ linear foot. Costs will vary depending on culvert size and actual length and accessibility. Combat Concrete GCCM material is an efficient, cost effective alternative for CMP repair and protection.

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