Horizontal saturated conductivity1 and specific yield2 of geologic materials. Sources:Duffield; Morris and Johnson
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Material Range Ksat (m/s)3 Typical Ksat (m/s) Range specific yield Typical specific yield
Gravel 3×10-4 to 3×10-2 3×10-3 0.21-0.28 0.24
Coarse sand 9×10-7 to 6×10-3 5×10-5 0.26-0.30 0.26
Medium sand 9×10-7 to 5×10-4 1×10-5 0.26-0.30 0.26
Fine sand 2×10-7 to 2×10-4 5×10-6 0.20-0.30 0.21
Silt, loess 1×10-9 to 2×10-5 1×10-7 0.15
Till 1×10-12 to 2×10-6 1×10-9 0.06-0.16 0.10
Clay 1×10-11 to 4.7×10-9 1×10-10 0.06-0.10 0.08

1vertical saturated conductivity is considered to be one-tenth the value of horizontal saturated conductivity.
2Specific yield is expressed here as a fraction. It is often reported as a percentage in the literature.
31 meter = 3.28 feet

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