Tony L. Wahl, Dale J. Lentz, Bruce D. Feinberg. 2012. "Appraisal-Level Prediction of Canal Breach Outflow Hydrographs". Bureau of Reclamation, Report Number PAP-1066.
Abstract: A program of physical model tests and numerical unsteady-flow simulations has been used to develop an appraisal-level tool for predicting the rate of breach development, time to peak outflow, amplitude of peak outflow, and outflow hydrograph recession time for breaching of homogeneous canal embankments. Physical model test results were used to develop relations between soil erodibility and rates of headcut advance and breach widening. These relations were consistent with previously developed relations in the literature for erosion and breaching of traditional embankment dams. Numerical studies developed separate relations for predicting breach outflow hydrograph characteristics as a function of canal hydraulic parameters, breach development rate, length of the canal pool containing the breach site, and the location of the breach relative to nearby canal check structures. A spreadsheet tool has been developed that incorporates all of these relations to predict breach outflow hydrographs as a function of embankment and canal properties. This capability will help water managers identify canal reaches and breach locations that have potential to produce large peak outflow rates. This could be used to prioritize emergency management planning activities or identify the need for additional detailed investigations.
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