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Animation model name +
Sand Boil near Levee +
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14:42:33, 16 May 2011 +
This show the bubbling of sand near a leve … This show the bubbling of sand near a levee in the lowlying farmlands, the sand seepage results from the pressure gradient that is caused by high river stage in flood conditions. This example is near Bennington Levee, Indiana, where the White River was at flood stage in March 2011. </br>The sand boil was an indicator of the underminng of the levee and a 25 ft breach did happen during this same flood. breach did happen during this same flood. +
Chris +
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Lee fish +
Bennington Levee +
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22:31:43, 21 June 2017 +
Movie +
sand boil results from seepage under levee +
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High river water that does not overtop a l … High river water that does not overtop a levee yet, can still create a tremendous water pressure. This pressure creates a potential for groundwater seepage of the water, through the underlying, permeable aquifer into the lowlands that are protected from direct flooding by an largely impermeable levee.</br>Sand and water start bubbling up on the floodplain; usually indicating that undermining of the levee is going on.that undermining of the levee is going on. +
March 2011 +
Image:Sandboil.png +
dFzgckaDq4o +
