An existing 785-foot Corrugated Metal Pipe (CMP) culvert, with a diameter ranging from 66” to 102”, was suffering from severe degradation. The culvert flowline was rusted through for much of the length, and the entrance was damaged during a heavy rain event, requiring an emergency repair. There were also reports of increased upstream flooding following the repairs. M3 was retained to address the degradation, flooding and the damage sustained by the culvert.
M3 first performed a field condition assessment and found the existing CMP culvert to be “fully deteriorated”, which implies a high risk of structural failure. Any rehabilitation alternative needs to assume the existing culvert has no remaining structural capacity. M3 then prepared...