Geoscience Formulas

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6 Terms

1
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Porosity

n = Vv / Vt

(Vv = volume of void)
(Vt = total volume)

2
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Darcy’s Law

v = -K * (h2 - h1)/L

(K = Hydraulic conductivity)
( h = hydraulic head)
(L = length of flow path)

3
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Rock Quality Designation

A measure of the quality of rock core samples, defined by the percentage of core recovery that is intact and free of fractures.

4
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UCS

The Uniaxial Compressive Strength (UCS) measures the maximum axial load a rock can withstand before failure, typically expressed in pounds per square inch (psi) or megapascals (MPa).

5
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Hydraulic Gradient

The hydraulic gradient is the change in hydraulic head per unit distance, commonly used to describe the flow of groundwater.

6
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Void Ratio

e = Vv / Vs

(Vv = volume of void)
(Vs = volume of soli