RELIABILITY ANALYSIS OF OPEN DRAINAGE CHANNELS UNDER MULTIPLE FAILURE MODES

Design of an open drainage channel involves uncertainty when considering factors such as runoff and channel capacity. Because the performance of the channel system is also uncertain, system performance is based on reliability analysis. This paper examines the reliability of open drainage channels under three possible failure modes. Those three failure modes are when: 1) the runoff exceeds channel capacity, 2) the actual flow velocity exceeds the maximum allowable velocity for erosion control, and 3) the actual flow velocity is less than the minimum allowable velocity for deposition control. The minimum and maximum allowable velocities are considered random variables. Using the advanced first-order second-moment (AFOSM) method, the failure probability is estimated. Also presented is the overall failure probability of the system that accounts for the correlations between the three failure modes. The AFOSM method was verified using Monte Carlo simulation. In practice, the method has applications in determining the reliability of an existing channel under multiple failures, evaluating the effects of alternative improvements, and designing new channels at specified reliability levels.

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  • English

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Filing Info

  • Accession Number: 00672360
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jan 23 1995 12:00AM