Miscellaneous Culvert Design Considerations
This section presents miscellaneous culvert design considerations, including multiple culvert openings, camber, horizontal and vertical angle points, upstream ponding, and […]
Hydraulics
Various types of drainage facilities are required to protect the highway against surface and subsurface water. Drainage facilities must be designed to convey the water across, along, or away from the highway in the most economical, efficient, and safe manner without damaging the highway or adjacent property. The purpose of this manual is to provide detailed information on the subjects of hydrologic and hydraulic analysis related to highway design. This manual should be used in conjunction with the Washington State Department of Transportation (WSDOT) Highway Runoff Manual and the WSDOT Design Manual, specifically Section 1210.
Culvert Debris Culvert Design
Debris problems can cause even an adequately designed culvert to experience hydraulic capacity problems. Debris may consist of anything from
Energy Dissipators Culvert Design
When the outlet velocities during the design-year storm event are 5 ft/s or greater, the PEO shall use an energy
Improved Inlets Culvert Design
When the head losses in a culvert are critical, the PEO may consider the use of a hydraulically improved inlet.
Wing Walls and Aprons
Buried structures greater than 10 feet long require wing walls. Wing walls and aprons are required with reinforced concrete box
Headwalls Culvert Design
A headwall is a concrete frame poured around a beveled culvert end. It provides structural support to the culvert, eliminates
Flared End Sections Culvert Design
A metal flared end section is a manufactured culvert end that provides a simple transition from culvert to channel. Flared
Mitered End Sections Culvert Design
A mitered end treatment consisting of cutting the end of the culvert at an angle to match the embankment slope
Projecting Ends of Culvert Design
A projecting end is a treatment where the culvert is allowed to protrude out of the embankment (see Figure 3-4).