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The following calculations are used in this test:

 

Hydraulic Conductivity

 

k = (d2 * L) / (D2 * Δt) * ln (h1 / h2)

 

where,

k        = Hydraulic conductivity

d        = Standpipe diameter

D        = Specimen diameter

L        = Specimen length

Δt        = Time interval

h1        = Head loss at beginning of time interval

h2        = Head loss at end of time interval

ln        = Natural logarithm