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The WSDOT headquarter hydraulics section provides technical support, training and policy in the fields of hydraulics, fish passage, hydrology and stormwater to ensure our roadways provide a safe, effective and efficient movement of people and goods while maintaining the natural movement and treatment of water throughout our watersheds and water bodies.

In addition, the headquarter hydraulics section coordinates and provides technical guidance and policy for research in the fields of hydraulics, fish passage, hydrology and stormwater. Find for more information (pdf 123 kb) about the Hydraulics Section roles and responsibilities in supporting statewide project delivery. 

Resource and guidance materials
Hydraulics Manual
Fish Passage
FHWA Hydraulics
Hydraulic Report Outline (pdf 173 kb)
Hydraulic Report Checklist (pdf 46 kb)

Highway Runoff Manual
Erosion Control
NPDES Permits
Stormwater Research
Water Quality

Precipitation Information
Washington 2-hour Isopluvail Maps (pdf 616 kb)
Washington 24-hour Isopluvial Maps (pdf 703 kb)
Washington Mean Annual Precipitation Map (pdf 173 kb)

Approved Drawings

Product Number: 00372519(pdf 254 kb)
Product Number: 00777501 (pdf 254 kb)
Product Number: 00777502 (pdf 249 kb)
Product Number: 00777011 (pdf 63 kb)