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FLOOD07955
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Last modified
1/25/2010 7:13:15 PM
Creation date
10/5/2006 3:19:30 AM
Metadata
Fields
Template:
Floodplain Documents
County
Statewide
Community
State of Colorado
Stream Name
All
Basin
Statewide
Title
Hydraulic Design of Bridges with Risk Analysis
Date
3/1/1980
Prepared For
USDOT
Prepared By
Federal Highway Administration
Floodplain - Doc Type
Educational/Technical/Reference Information
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<br />assume that the required capital investment for a stream crossing <br />increases as the exceedence probability of the design flood is decreased. <br />Assume also that annual maintenance costs, user costs, damages from <br />backwater, and repair and replacement costs decrease with designs for <br />smaller exceedence probabilities. Summation of the annual capital costs <br />and annual maintenance and operations costs yields the total annual <br />costs for any given exceedence probability. A graphical presentation of <br />these costs versus exceedence probability provides a basis for making a <br />rational design selection. <br /> <br />Techniques for making engineering and economic studies for the <br />least cost or optimum designs are presented in this report as well as <br />suggestions for minimizing the time and work required for such studies. <br />Procedures for developing engineering information, such as water-surface <br />elevation-discharge relations, are not included. <br /> <br />This report begins with a chapter on the mechanics of the study. A <br />design philosophy is discussed which allows a designer to determine the <br />optimum design. The concept of risk analysis is introduced as a technique <br />to evaluate the relationship between construction costs, probable future <br />damage to highways, future damage to other property associated with the <br />highway encroachment on the flood plain, and the costs for traffic using <br />alternative routes and detours. Budgetary constraints, the need for <br />emergency supply and evacuation routes, and the need for emergency <br />vehicle routes either may be included in the risk analyses to the extent <br />that their value can be stated in dollars or may be considered in <br />conjunction with the risk analysis. The analysis procedures are <br />then summarized as a 16-step process culminating in a report. A <br />suggested report outline is included. <br /> <br />Next, descriptions of the data collection and analysis procedures <br />are included in the chapter on the report of the evaluation. This <br />chapter generally follows the suggested report outline and the outline <br />of the two example studies which are included as Appendices A and B. <br />The two example studies include a rural site where the potential for <br />backwater damage is low and traffic volumes are moderate, and an urban <br />site where the potential for backwater damage is high and the traffic <br />volume is heavy. <br /> <br />This report and the two example studies do not cover every circumstance <br />and condition that occur in the design of encroachment. The study <br />framework is sufficiently general so that situations not covered can be <br />easily incorporated. <br /> <br />3 <br />
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