Assignment Task
True/False: Circle the most correct response.
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Get Help Now!- Pressure head approaches zero above the capillary fringe. T F
- The process of retardation tends to decrease the velocity of a dissolved contaminant. T F
- The coefficient of molecular diffusion D has dimensions of L/T2 . T F
- Sorption can be a reversible process. T F
- In groundwater recharge areas, the hydraulic head at the water table is usually greater than that of zones below the water table. T F
- The water level in a piezometer with a measurement point located in the capillary fringe will rise to the height of the top of the capillary fringe. T F
- Pumping an aquifer results in a decrease in the effective stress within that aquifer. T F
- Hydraulic conductivity is dependent on groundwater temperature. T F
- For a conservative chemical, such as chloride, it migrates in a porous medium without retardation, and thus its retardation factor is usually 0. T F
- Dispersion coefficients in homogeneous sand tend to be lower than those in heterogeneous sand. T F
Calculations
- A sample of soil has total volume and mass of 400 cm3 and 414.5 g, respectively. It is known that the porosity of this soil is 0.35 and also that the predominant mineral is quartz (i.e., particle density can be considered as 2.65 g/cm3 ). a) An effective stress of 100 kPa is evenly applied to this sample, causing a reduction in volume of 5%. Calculate the compressibility of the soil.
b) Assume that the compression is due to grain reorientation, calculate the porosity of the sample after the compression.
- The following map shows a set of monitoring wells in an unconfined sand and gravel aquifer, with an average hydraulic conductivity of 4×10-4 m/s, and a porosity of 20%. a) Create a contour map of the water table surface using on a 10 meter interval, and indicate the direction of average groundwater flow with 2 flowlines.
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