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Free-Flow Leakage from Landfill Geomembrane Defects

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defect density (defects/hectare)
20
fill
Bottom
Top
Axis
average hydraulic head (in)
1
​
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Installation defects in landfill geomembranes (GM) result in leakages. Free-flow leakage is a special worst-case scenario in which the controlling layers surrounding the GM are assumed to be hydraulically conductive. A specialized form of Bernoulli's principle can be used to describe the relationship among defect density, average hydraulic head and free-flow leakage rate, assuming that the head loss coefficient for sharp-edged landfill orifices is 0.6 and the defect area is 0.0001
2
m
for the time step of 1 day.
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