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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