The Northern Region Hydraulics Group is responsible for hydraulic design of all cross drainage culverts 48” in diameter and larger with spans less than 20 feet. The Northern Region Hydraulics Group is also responsible for hydraulic design of all fish passage culverts, regardless of size. Chapter 9 of the AK Highway Drainage Manual covers the current ADOT policy and criteria for culvert design.
Field data collection is needed for design of culverts. Consultation with the Northern Region Hydraulics Group early in the design process is important to facilitate scheduling of data collection for culvert and drainage design.