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Hydraulics Manual - Web Page
The Hydraulics Program is responsible for developing and maintaining the ODOT Hydraulics Manual.  This program is part of Geo-Environmental’s Engineering and Asset Management Unit
Hydraulics Engineering Program Lead
Hydraulics Manual ​

The manual changes are effective beginning August 1, 2014. These changes supersede all previous versions and apply to new designs projects as of the effective. New ODOT designed projects are those that do not have an approved DAP by the effective date. New outsourced projects are those that do not have an executed work order contract for PE by the effective date. However, existing projects may make use of the new changes, if agreed to by the CPM or Project Team Leader.

Edits within existing chapters are shown in blue highlighting. Chapter or appendix titles highlighted in green are new.

Changes were made to chapters 3, 4, 5, 6, 12, 13, 14 and 17.

New guidance added to the manual includes:
Temporary Water Management (Chapter 18) ​ ​



Cover Page / Preface    

​Chapter ​
1 - Introduction 10 - Bridges
11 - Energy Dissipaters
12 - Storage Facilities
4 - Documentation 13 - Storm Drainage
5 - Pipe Materials ​​14 - Water Quality
6 - Data Collection 15 - Bank Protection
7 - Hydrology 16 - Trenchless Technology
8 - Channels 17 - Field Markers
9 - Culverts 18 - Temporary Water Management


3 - A Hydraulic Design Deviation Form
4 - A Preliminary Hydraulic Recommendations Example
4 - B Hydraulics Report Example
4 - C Pavement Drainage, Storm Drainage, Water Quality and Detention Basin Design Documentation for Developers or Non-ODOT Projects
4 - D Operation and Maintenance Manual Examples ​
6 - A Streambed Material Analysis Methods
6 - B Topographic Data Required for Bridge Backwater Analysis
6 - C Topographic Data Required for Culvert Analysis
​6 - C Topographic Data Required for Culvert Analysis
6 - D Culvert Inspection Form
6 - E Topographic Data Required for Stormwater Analysis
6 - F Storm Drain Pipe Inspection Form
7 - A Rainfall Intensity - Duration - Recurrence Interval Curves
        * Estimation of Peak Discharges for Rural, Unregulated Streams in Western Oregon 
        * Magnitude and Frequency of Floods in Eastern Oregon
7 - D USGS Regression Equations for Arid Regions of Rural Eastern Oregon
7 - E USGS Nationwide Urban Regression Equations
7 - F Rational Method
7 - G NRCS Unit Hydrograph Method
7 - H Oregon 24 Hour Precipitation Maps
7 - I 2-Year 7-Consecutive Day Low Flows
7 - J Mean Daily Exceedance Discharges
7 - K Maximum Predicted Discharge Based on Station Records and Envelope Curve
8 - A Hydraulic Roughness (Manning's n) Values of Conduits and Channels
8 - B Hydraulic Properties of Conduits
9 - A Culvert Performance Charts
9 - B Culvert Design Sheet
9 - C Debris-Control Structures
13 - A Pavement Drainage
13 - B Gutter Flow
13 - C Inlets
13 - D Inlet Capacity and Spacing
13 - E Access Structures
13 - F Storm Drains
13 - G Hydraulic Grade Line
13 - H Design Charts
14 - A Low Impact Development Approach
14 - B Biofiltration Facilities
14 - C Media Filtration Facilities
14 - D Density Separation Facilities
14 - E Stormwater Treatment Facility Components
14 - F Oil Control Structures
4-1 Example Cross-Section of Proposed Bridge
4-2 Example Culvert Elevation View Drawing
5-1 Plan and Profile for Storm Drain Example Problem
7-A-1 Rainfall IDR Curve Zone
7-A-2 Rainfall IDR Curve Zone with Mile points
7-D-1 Northwest Flood Region Boundary
7-D-2 Mean Annual Precipitation in Eastern Oregon
7-H-1 2-Year 24-Hour Precipitation
7-H-2 10-Year 24-Hour Precipitation
7-H-3 25-Year 24-Hour Precipitation
7-H-4 50-Year 24-Hour Precipitation
7-H-5 100-Year 24-Hour Precipitation
7-H-6 500-Year 24-Hour Precipitation
7-H-7 1000-Year 24-Hour Precipitation
7-I-1 Boundary Between Western and Eastern Oregon
7-I-2 Normal Annual Precipitation 1930-1957 State of Oregon
7-I-3 Mean Minimum Temperature (°F), January in Western Oregon
7-I-A 2-Year 7-Consecutive Day Low Flow Discharges for Western Oregon
7-I-B 2-Year 7-Consecutive Day Low Flow Discharges for Eastern Oregon
Link to Previous Versions
2005 Version
2011 Version




Technical Bulletins
Technical Bulletins may be issued between manual updates. Bulletins are intended to provide immediate guidance on process, procedures and design information for users until the next manual update, at which time the bulletin may be incorporated into the Hydraulics Manual.
Other Programs/Resources

Stormwater Management Program  Hydraulic Data Resources 
Culvert Management Creating or Revising Standard Drawings & Details  
FEMA (Flood Maps)  ODOT O&M Manuals