Various types of drainage facilities are required to move water under, along or away from a highway. These facilities must be economical and efficient, as well as possess the capacity to do so without damaging the highway or endangering motorists.
The Hydraulics Manual provides hydrologic and hydraulic analysis procedures for most situations encountered in highway design.
Please contact the Hydraulics Engineering Unit should a situation arise that is not described in this manual. Requesting assistance as soon as questions or problems arise is highly encouraged, as it will allow for the time needed to develop a satisfactory solution and likely reduce the amount of redesign needed.