American Society of Civil Engineers

Hydrology and Hydraulic Analysis for a Drainage Rehabilitation Project on Interstate Highway 80 in California

by Z. Luo, (Office of Office Engineer, Division of Engineering Services, California Department of Transportation, MS 43, 1727 30th Street, Sacramento, CA 95816. E-mail: and M. Peng, (District 3 Construction, California Department of Transportation, 2777 Del Monte Street, West Sacramento, CA95691. E-mail:
Section: Stormwater Management, pp. 620-630, (doi:

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Document type: Conference Proceeding Paper
Part of: Watershed Management 2010: Innovations in Watershed Management under Land Use and Climate Change
Abstract: The drainage systems on Interstate Highway 80 (I-80) at Emigrant Gap in California were built in 1950s. After more than 50 years of service, most of these systems are in poor conditions and need major rehabilitation. A procedure has been developed to perform hydrology and hydraulic analysis for these systems, based on information available to design engineers, including as-built plans, Geological Survey (USGS) maps, aerial images, etc. The design flood volumes are calculated using the Rational Method and the National Resources Conservation Services TR-55 method, while the hydraulic capacities of drainage systems are calculated using the software program CulvertMaster. The results show that the capacities of many culverts are reduced as a result of the proposed rehabilitation work, which is not expected by engineers who used to believe that a smoother surface might offset the reduction in cross section area on flow capacity. This paper summarizes the procedures and methods used in this project to determine the final rehabilitation treatments.

ASCE Subject Headings:
Highways and roads