FHWA Resource Center
GEOTECH & HYDRAULICS TEAM
Hydraulic Engineering Circular No. 22, 2nd Edition
URBAN DRAINAGE DESIGN MANUAL
Publication No. FHWA-NHI-01-021
August 2001
ABSTRACT:
The Urban Drainage Design Manual, Hydraulic Engineering Circular No. 22 (HEC-22), provides a comprehensive and practical guide for the design of storm drainage systems associated with transportation facilities. Design guidance is provided for the design of storm drainage systems which collect, convey, and discharge stormwater flowing within and along the highway right-of-way.
Methods and procedures are given for the hydraulic design of storm drainage systems. Design methods are presented for evaluating rainfall and runoff magnitude, pavement drainage, gutter flow, inlet design, median and roadside ditch flow, structure design, and storm drain piping. Procedures for the design of detention facilities are also presented, along with an overview of stormwater pumping stations and urban water quality practices.
This edition includes corrections of minor errors and inclusion of dual units.
DOCUMENT AVAILABILITY:
To download an electronic copy:
RELATED NHI TRAINING COURSE:
FHWA-NHI-135027, Urban Drainage Design
FHWA-NHI-135028, Stormwater Pump Station Design
RELATED FHWA SOFTWARE:
Visual Urban – Urban Drainage Design Programs (2002)
FHWA TECHNICAL CONTACTS:
Mr. Dan Ghere
Hydraulics Engineer, FHWA Resource Center
Phone: (708) 283-3557
Email: dan.ghere@fhwa.dot.gov
Mr. Joe Krolak
Sr. Hydraulics Engineer, FHWA HQ
Phone: (202) 366-4611
Email: joseph.krolak@fhwa.dot.gov
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