Lecture 48 - Groundwater Transport Lecture #48 advection in...

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Groundwater Transport ± Lecture #48 ± advection in porous media ± Darcy’s Law ± ICP #40 ± Reading: M: Ch 5 (CNP: pg. 73-84) What you should know ± 1. What the terms hydraulic conductivity, hydraulic gradient, and groundwater advection mean. ± 2. How to describe 1D advection in groundwater. ± 3. How to apply Darcy’s Law to estimate time of arrival of a contaminant. ± 4. What the retardation factor is, how to calculate it, and its impact on contaminant movement in the subsurface. Groundwater ± unsaturated (vadose) zone: partially air filled region ± saturated zone: water filled zone ± water table: top of saturated zone ± capillary fringe: contains water that rises due to capillary action in small pores ± aquifer: water filled zone ± aquitard: impermeable layer often comprised of a clay layer Groundwater and Transport Groundwater Supplies Groundwater Supplies Long residence times of many groundwaters put them at risk for long term contamination if polluted
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Groundwater Contamination Suppose one gallon of tetrachloroethylene (PCE) is spilled into groundwater. How much groundwater could it contaminant to the MCL? light non-aqueous phase liquid dense non aqueous phase liquid PCE Contamination ± PCE: C sat = 200 mg/L; MCL: 5 ppb (5 ug/L); ρ PCE = 1.62 g/L ± 1 gal = 3.785 L
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Lecture 48 - Groundwater Transport Lecture #48 advection in...

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