Drainage Basin
Drainage basins are the areas that contribute runoff to a point of interest such as catch basins, inlets, culverts, drainage […]
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.
Selecting a Method of Hydrology
The first step in performing a hydrologic analysis is to determine the most appropriate method. The methods for determining runoff
Introduction to Hydrology
This chapter presents WSDOT’s procedures and acceptable methodologies for hydraulics and hydrologic analyses for transportation hydraulic features. The procedures and
Hydraulic Milestones and Scheduling
WSDOT has developed the Project Management and Reporting System to track and manage projects. This system uses a master deliverable
Hydraulic Report Review Schedule
Hydraulic reports developed for WSDOT must be reviewed and receive concurrence by the State Hydraulics Office or RHE (per Table
Storm Frequency Policy and Design Tools and Software
WSDOT policy regarding design storm frequency for hydraulic structures has been established so the PEO does not have to perform
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Existing Stormwater Drainage Conveyance System
During the scoping phase, a stormwater and hydraulic assessment is done for the project. If the assessment identified any parts
Upstream and Downstream Analysis
Conducting an upstream and downstream analysis as part of a Type A or B or specialty report identifies, evaluates, and
Developers and Utility Agreements
Developers, state and local agencies, utilities, and others designing stormwater facilities within the WSDOT ROW shall assume the same responsibility