Movie:Sand Boil behind Levee: Difference between revisions
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|Animation model name = | |Animation model name = | ||
|First name contributor=Chris | |First name contributor=Chris | ||
|Last name contributor=Lee fish | |Last name contributor =Lee fish | ||
|Location movie=Bennington Levee | |Location movie=Bennington Levee | ||
|Timespan movie=March 2011 | |Timespan movie=March 2011 | ||
Revision as of 14:08, 1 June 2015
Information Page: Sand Boil behind Levee
Play Movie
Sand Boil near Levee
Key Attributes
| Domain: | terrestrial, hydrology |
| Keywords: | levee |
| Keywords: | groundwater |
| Keywords: | seepage |
| Keywords: | flood risk |
| Model name: | |
| Name: | Chris, Lee fish |
| Where: | Bennington Levee |
| When: | March 2011 |
Short Description
Grade level: Middle (6-8), High (9-12), Under graduate (13-16), Graduate / Professional
Statement: sand boil results from seepage under levee
Abstract: 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. The sand boil was an indicator of the underminng of the levee and a 25 ft breach did happen during this same flood.
Theory
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. Sand and water start bubbling up on the floodplain; usually indicating that undermining of the levee is going on.
Links
References
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