CULVERT HYDRAULICS. The Engineer shall use the above-listed manuals to prepare and submit the work under this task. The hydraulic calculations shall have the following: • Determine flows for cross culvert drainage systems. • Determine the sizing of the drainage crossings. The scope includes replacing non bridge-class culvert crossing or crossings as specified in the Work Authorization. • Develop designs that minimize the interference with the passage of traffic or cause damage to the highway and local property in accordance with the State’s Hydraulic Design Manual, District criteria and any specific guidance provided by the State. Cross drainage design shall be performed using HY-8, HEC RAS or Bentley’s CulvertMaster • Description-Material, Size, & Entrance(headwall) • Design discharges, Flow per barrel, barrel slope, and Xxxxxxx n-value • Inlet flow line, allowable headwater, roadway (shoulder) elevation, calculated inlet headwater elevation DocuSign Envelope ID: F43CDC74-DA27-4A02-AC2A-90D8CB2811D6 • Outlet flow line, Tailwater for design frequency/frequencies, type of flow, critical depth, and calculated friction losses, calculated outlet water elevation • Controlling headwater elevation, outlet velocity, and recommended countermeasures to maintain an acceptable outlet velocity.
