Author(s): Yeoukoung Tung; A. Mainard Wacker; Victor Hasfurther
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Keywords: No Keywords
Abstract: The purpose of a highway is to serve the public. The commonly used design para meter is the design flood frequency which is arbitrary and is based on practices that have "evolved" over the years. During the late 1970's and early 1980's, the concept of risk-based(least total expected cost, LTEC) analysis was developed for determining the design flood frequency for various hydraulic structures. The risk-based analysis yields a structural design associated with the minimum total amount of structural installation cost and expected future flood related damage cost. The corresponding design frequency is herein called the LTEC design frequency. However. there exist many intangible factors that might affect the final adoption of a design flood frequency. In this pa-per, two types of design frequencies, namely, the LTEC and extended-LTEC design frequencies, are studied. The LTEC design frequency is the conventional, solely economically-based design frequency using tangible factors whereas the extended-LTEC design frequency considers other intangible factors in the determination of flood design frequency for highway drainage structures.
Year: 1997