Oklahoma Department of Transportation

ODOT Roadway Drainage Manual, Chapter 10: Stormwater Drainage

StateOklahomahighNo

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Jurisdiction level

state

“ODOT ROADWAY DRAINAGE MANUAL”
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State

Oklahoma

“Oklahoma Department of Transportation”
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Version / edition

November 2014

“ODOT Roadway Drainage Manual November 2014”
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independent

“Chapter 7 "Hydrology," discusses ODOT's practices with respect to hydrology. This section discusses the application of the hydrologic practices specifically to storm drainage systems.”
Section 10.8.1, Page 10.8-1

Design Criteria

Design storm return periods (years)

5-year, 10-year, 50-year, 100-year

“Freeways and Arterials on grade 10-year ... Freeways and Arterials at sag 50-year ... Local Road - 2 lanes on grade 5-year ... The review flood frequency is typically the 100-year return period.”
Figure 10.5-A and Section 10.8.3, Pages 10.5-1 and 10.8-1

Water quality volume method

No statewide water quality volume sizing in Chapter 10; OPDES-regulated systems may require urban BMPs per local ordinances and HEC-22 Chapter 10 guidance when directed by ODOT Environmental Programs Division.

“ODOTs Environmental Programs Division will inform the designer if water quality practices are required, depending on local ordinances and regulations in specific project locations. HEC-22 (2), Chapter 10 provides an introduction to the types of BMPs that have been historically used to provide water quality benefits.”
Section 10.6.2, Page 10.6-1

Peak flow calculation method(s)

Rational Method

“The Rational Method is the most common method used for the design of storm drains when the peak-flow rate is desired. Its use should be limited to systems with drainage areas of 640 acres or less.”
Section 10.8.4, Page 10.8-1

Required hydrologic/hydraulic software

HEC-22, FHWA Hydraulic Toolbox

“The hydraulic methodology in HEC-22 (2) for the hydraulic analysis and design of a storm drainage system has been adopted.”
Section 10.13.3, Page 10.13-3

Approved BMP categories

Detention Basins, Storm Drainage Pipe Storage, Swales and Channels, Urban BMPs per HEC-22 Chapter 10 (when OPDES or local requirements apply)

“The reduction of peak flows can be achieved by the storage of runoff in detention basins, storm drainage pipes, swales and channels and other detention storage facilities.”
Section 10.4.9, Page 10.4-4