Use this geological calculation for a transparent first-pass interpretation of measured rock, soil, fluid, well, stratigraphic, isotopic, geophysical, or seismic data under an explicitly selected model.

K

Hydraulic conductivity in centimeters per second.

C

Hazen coefficient C in reciprocal centimeter seconds.

Invert the Hazen formula K = C * D10^2 to estimate the effective grain size D10 in centimeters from hydraulic conductivity in cm/s and the Hazen coefficient in 1/(cm*s). The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

D10

Effective grain size D10 in centimeters.

• Geological models are scale-, site-, method-, and calibration-dependent. Heterogeneity, anisotropy, sampling, diagenesis, pressure-temperature history, instrument response, boundary conditions, and empirical-correlation range can dominate the result.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Compare independent measurements and models, retain units and analytical metadata, propagate uncertainty, and validate interpretations against logs, cores, maps, laboratory data, or field observations.

• Curvature Coefficient Calculator

  Compute the gradation curvature coefficient Cc = D30^2 / (D60 * D10) from grain sizes in millimeters read from a gradation curve.

• Uniformity Coefficient Calculator

  Compute the uniformity coefficient Cu = D60 / D10 from grain sizes in millimeters read from a gradation curve.

• Darcy Discharge Calculator

  Compute the total Darcy flow discharge in cubic meters per second as hydraulic conductivity times gradient times cross-sectional area.