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Fate & Transport Model

1D Advection-Dispersion model with retardation and biodegradation. Domenico (1987) analytical solution for contaminant migration screening.

Source Zone

Source Concentration (mg/L)

Source Length (m)

Source Width (m)

Source Depth (m)

Aquifer Properties

Hydraulic Conductivity (m/day)

Hydraulic Gradient (-)

Effective Porosity (-)

Bulk Density (kg/L)

Transport Parameters

Long. Dispersivity (m)

Trans. Dispersivity (m)

Vert. Dispersivity (m)

Distribution Coeff. Kd (L/kg)

Half-Life (days, 0=no decay)

Receptor Location

Distance Downgradient (m)

Off-Centerline (m)

Depth Below WT (m)

Simulation Time (years)

Enter parameters and click Run Simulation

Contaminant transport results will appear here

Common Kd Values

Contaminant	Kd (L/kg)	Notes
Benzene	0.1-1	Low sorption, mobile
Toluene	0.5-5	Low-moderate sorption
Trichlorobenzene	10-100	Moderate sorption
Low MW PAHs	10-100	Naphthalene, fluorene
High MW PAHs	100-10000	Benzo(a)pyrene, etc.
Lead	100-10000	Strongly sorbs, pH dependent

Common Half-Lives

Contaminant	Half-Life (days)	Notes
Benzene	180	Aerobic conditions
Toluene	90	Aerobic conditions
Xylene	180	Aerobic conditions
MTBE	730	Slow degradation
TCE	1095	Anaerobic only
PCE	1825	Very slow
Conservative (no decay)	N/A	Metals, recalcitrant

About This Model

Domenico (1987) Solution

This model uses the Domenico analytical solution for 3D transport from a finite source. It includes advection, 3D dispersion, linear retardation, and first-order decay. Suitable for preliminary screening assessments.

Limitations

Assumes homogeneous, isotropic aquifer
Steady-state flow conditions
Constant source concentration
Linear equilibrium sorption
Not suitable for complex hydrogeology