Channels, whether active streams or open roadside ditches, are vulnerable to erosion, especially after construction. Maintenance personnel should inspect these facilities periodically and after significant storms for any erosion that will require remedial work.

Intercepting channels should be kept clean and free of brush, trees, tall weeds, and other material that decreases the capacity of the channel. When channel deterioration reduces channel capacity, overflow may occur more frequently, and erosion or deposition in the area adjacent to the channel may take place. Natural channels that are parallel to the roadway embankment may be best maintained in their natural state. This reduces the probability of embankment erosion.

High velocity flow in chutes or ditches often overtops the sides and erodes the adjacent area. Care must be taken to inspect for holes and eroded areas under paved channels to prevent collapse of rigid sections. Projections and joint offsets that cause splash and possible erosion should be removed or repaired. The channel entrance should not permit water to flow either along the side or underneath the channel.

Periodic inspection of channel changes is necessary to avoid costly repairs. Failures during construction should be carefully analyzed before performing remedial work because changes in the original construction may be indicated.