Reliability--based Assessment of Erodible Channel Capacity


Abstract: The surface drainage of an irrigation area is concerned with the collection and removal of storm runoff and excess water from irrigation applications. The engineering problem is to determine the shape, cross-sectional area and slope of a stable channel. A reliability-based design, which addresses and treats possible uncertainties associated with the design parameters, is of importance as it leads to realistic decision-making. In this paper, a reliability-based assessment of erodible channel capacity based on the regime concept is carried out in an example using the Advanced First Order Second Moment formulation and the Monte Carlo simulation technique. A sensitivity analysis is also carried out to observe the effects of coefficient of variation and probability distributions. The results obtained from both approaches are found to be in relatively good agreement.

Keywords: Reliability, Erodible channel, Advanced first order second moment formulation, Monte carlo simulation

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