Reliability Analysis of Levee System of a River

by Kazumasa Mizumura, Kanazawa Inst of Technology, Ishikawa, Japan,

Document Type: Proceeding Paper

Part of: Hydraulic Engineering


The levee height is determined by the summation between computed water level and an assumed freeboard. The water level is computed by given discharge in the steady conditions. Therefore, the water level is the function of the discharge, a rating curve, channel conditions such as cross-sectional data and bottom slopes, and friction coefficients.The unsteady condition also must be considered during flood. Even if the accurate discharge is selected based on the past data and probability law, the other conditions are not appropriate and the computed water level is not reliable. This study computes the reliability of the unsteady flow for given channel conditions and friction coefficients without a rating curve. The method for the unsteady computation without a rating curve is developed. This shows the water level always has reliability or risk based on the used assumptions during the computation.

Subject Headings: Water discharge | System analysis | Ratings | Curvature | System reliability | River systems | Friction | Channel flow

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