Culverts CDOT

9.2 DESIGN CRITERIA

Culvert Alignment From the standpoint of hydraulic efficiency, durability, and maintenance, abrupt changes in flow direction are undesirable. The maximum angle of bend at any point along a culvert’s horizontal or vertical alignment should be 22° 30’.

Culvert Length

The culvert length should be increased to compensate for soil sloughing from steep, high fills by projecting the culvert end out an additional 1 foot for each 10 feet of fill height.

Culvert Skew

Culvert skew is the acute horizontal angle left or right (looking in the direction of increasing stations) between the centerlines of the roadway and culvert.

The culvert skew must not be less than 45 degrees without the approval of the Region Hydraulic Engineer.