Hydrogeology. Kevin M. Hiscock

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S cm⁻¹ Eh redox potential V e void ratio e‐ electron eq chemical equivalent (see Box 4.1) eq L⁻¹ F Faraday constant (9.65 × 10⁴ C mol⁻¹) F Darcy–Weisbach friction factor f _c infiltration capacity cm h⁻¹ f _t infiltration rate cm h⁻¹ f _oc weight fraction organic carbon content G Gibbs free energy kJ mol⁻¹ g gravitational acceleration m s⁻² g gram (mass) (g) gas H depth (head) of water measured at a flow gauging structure m H enthalpy kJ mol⁻¹ h hydraulic head m I ionic strength mol L⁻¹ i hydraulic gradient IAEA International Atomic Energy Agency IAP ion activity product molⁿ L⁻ⁿ J joule (energy, quantity of heat) K equilibrium constant molⁿ L⁻ⁿ K (hydraulics) hydraulic conductivity m s⁻¹ K (temperature) kelvin K _d partition or distribution coefficient mL g⁻¹ K _f fracture hydraulic conductivity m s⁻¹ K _H Henry’s law constant Pa m³ mol⁻¹ K _oc organic carbon‐water partition coefficient K _ow octanol‐water partition coefficient K _s selectivity coefficient K _sp solubility product molⁿ L⁻ⁿ k _i intrinsic permeability m² L litre (volume) LNAPL light, non‐aqueous phase liquid l length m MNA monitored natural attenuation m mass kg mol amount of substance (see Box 4.1) n an integer n roughness coefficient (Manning’s n) n porosity n _e effective porosity P Peclet number P precipitation amount mm P pressure Pa (or N m⁻²) P partial pressure atm or Pa P _A′ P_o atmospheric pressure atm or Pa Pa pascal (pressure) P _w porewater pressure Pa or m of water PAH polycyclic aromatic hydrocarbon PDB Pee Dee Belemnite PE potential evapotranspiration mm

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