Hydrogeology

Hydrogeology calculators and formulas for groundwater flow through porous media. Includes Darcy's law, hydraulic conductivity, and aquifer transmissivity calculations.

12Formulas

All levels Difficulty

Updated Jul 2026

← All Geology & Earth Science (30) Hydrogeology (12)

Fundamental

Groundwater Seepage (Linear) Velocity

v_s = v / n

Fundamental

Well Specific Capacity

Sc = Q / s

Fundamental

Groundwater Recharge Rate

R = P - ET - RO

Fundamental

Porosity

n = (Vv / Vt) * 100

Fundamental

Specific Yield (Unconfined Aquifer)

Sy = Volume of Water Drained / Total Volume of Aquifer

Fundamental

Aquifer Storativity (Confined Aquifer)

S = Ss * b

Fundamental

Well Drawdown (Thiem Equation, Confined Aquifer)

s = (Q / (2π*T)) * ln(R/r)

Fundamental

Hydraulic Conductivity from Intrinsic Permeability

K = (k * ρ * g) / μ

Fundamental

Groundwater Volumetric Flow Rate (Darcy's Law)

Q = K * A * (dh/dl)

Fundamental

Darcy's Law (Groundwater Flow Velocity)

v = -K * (dh/dl)

Fundamental

Aquifer Transmissivity

T = Kb

Fundamental

Darcy's Law

Q = −KA(dh/dl)