Hydraulic Conductivity Calculator

About this calculator

Hydraulic conductivity (K) describes how easily groundwater moves through a saturated soil or rock formation. It follows Darcy's law, Q = K·A·i, where Q is the volumetric flow rate, A is the cross-sectional area the water flows through, and i is the hydraulic gradient (the head loss per unit distance). Rearranged, K = Q ÷ (A × i), so the calculator solves directly for K once you supply the other three measured quantities.

K values span many orders of magnitude — from under 10⁻⁹ m/s in clay to over 10⁻² m/s in gravel — and that spread is exactly what determines how fast a well recharges or a contaminant plume spreads. Hydrogeologists, environmental consultants, and water-well drillers use this calculation from pumping tests or permeameter data to size wells, model aquifer yield, and assess contamination risk.