Hydraulic Grade Line
The HGL shall be designed so there is air space between the top of water and the inside of the […]
Design Criteria of Storm Sewer
Along with determining the required pipe sizes for flow conveyance and the HGL, storm sewer system design should consider the
Introduction to Storm Sewer
A storm sewer is a pipe network that conveys surface drainage from a surface inlet or through a manhole to
Scupper Barrier
Scuppers in median barriers shall not be used in the following situations: • Passing runoff from one side of a
Grate Types
Grate Types Grates are an essential component in ensuring the efficiency of a drainage system. The following grates (except the
Inlet Structure Types
WSDOT uses grate inlets, catch basins, and manholes to capture runoff for WSDOT projects. Each inlet structure type has different
Drainage Structures
Many variables are involved in determining the hydraulic capacity of an inlet structure including depth of flow, grade, superelevation, and
Capacity of Inlets at Sag Locations
By definition, a sag is any portion of the roadway where the profile changes from a negative grade to a
Capacity of Inlets on a Continuous Grade
The flow that is not intercepted by an inlet on a continuous grade and continuous run of curb and gutter