Groundwater movement Objective To be able to calculate the hydraulic conductivity of a sample given measurements from a permeameter To be able to evaluate.

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Presentation transcript:

Groundwater movement Objective To be able to calculate the hydraulic conductivity of a sample given measurements from a permeameter To be able to evaluate Reynolds Number and the validity of Darcy’s Law for groundwater flow To be able to quantify intrinsic permeability as an inherent property of ground material To be able to quantify the temperature dependence of hydraulic conductivity To be able to estimate hydraulic conductivity from a tracer test and describe limitations of this method

Darcy’s experiment: Pressure distribution and head loss in flow through a sand column From Mays, 2011, Ground and Surface Water Hydrology

The figure shows a sample from an unconfined aquifer. L=50 cm, Diameter = 6 cm. The sample is tested for 3 min under constant head difference of 16.3 cm cm 3 of water is collected at the outlet. Determine the hydraulic conductivity of the sample Determine the average interstitial velocity assuming a porosity of 0.3 Determine the Reynolds number assuming an effective grain size (d 10 ) of cm From Mays, 2011, Ground and Surface Water Hydrology

Water Viscosity at different temperatures From