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Darcy’s Law Calculator
Estimate the volumetric flow rate of fluid through a porous medium (like soil or an aquifer) using Darcy’s Law.
m/day
m
m
m²
What Darcy’s Law Calculates
Darcy’s Law describes how fluid flows through a porous medium such as soil, sand, or rock. It is the foundation of groundwater hydrology and is used to estimate how much water moves through an aquifer over time.
The Formula
The law states Q = K × (Δh / L) × A, where K is the hydraulic conductivity of the material, Δh/L is the hydraulic gradient (the drop in water level over the flow distance), and A is the cross-sectional area the flow passes through.
Note: this tool is for general planning and educational purposes; real aquifers are often heterogeneous and may require site-specific testing.
Last reviewed August 2026