Minimizing Roadway Embankment Damage from Flooding (2016) / Chapter Skim
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8 CHAPTER TWO FAILURE MODES 1. Overtopping erosion 2.
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9 topping flow. This case is the most problematic, and generally occurs during hurricane events in coastal environments.
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10 • Subcritical flow over the embankment crest (Zone 1) , which is characterized by the critical depth (Yc)
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11 of the road elevation, construction of sand dunes, and armoring of shoulders to prevent back erosion. For both riverine and coastal embankments, different protection options for the downstream slope are discussed further in chapter eight.
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12 the effective stress is very low at the exit face of the flownet associated with the underseepage, which weakens the toe of the downstream slope (Chen and Anderson 1987; Seed et al. 2005; Bonelli 2013)
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13 the imposed hydrostatic lateral forces. Such resistance can be achieved by keying the embankment in the foundation soil to generate a passive resistance situation in the foundation soil mass.
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