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UBC Theses and Dissertations

Optimal culvert size selection Neudorf, Patrick Alexander


The hydraulic design criteria for culvert size selection currently employed by most highways departments, including British Columbia's, can lead to economically non-optimal culvert size choices. This thesis describes a method of economic analysis to determine the optimum sized culvert for any culvert site, taking into direct account the uncertainty of the data. The method is applied to a hypothetical culvert site, assuming different hydro-logic and economic situations. The uncertainty in evaluating flood flows is taken into account, and methods of calculating the value of better information are presented. The hydrologic, hydraulic, and economic aspects of culvert selection and the problems and uncertainties in collecting data and making assumptions in each of these areas are discussed before the results are presented.

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