Review Question Consider an unconfined aquifer overlying impermeable bedrock with the following properties Porosity 27% Specific retention 12% Thickness.

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Presentation transcript:

Review Question Consider an unconfined aquifer overlying impermeable bedrock with the following properties Porosity 27% Specific retention 12% Thickness 15 m Hydraulic conductivity 12 m/day Assume that there is 2 cm of precipitation that all infiltrates and percolates to the water table, calculate the water level rise (m). [10] How much water can be produced by lowering the water table by 2 m over an area of 1 km2. Report your result in m3. [10] [20 points]

2. For a particular location the average net radiation is 145 W/m2, air temperature is 24 C, relative humidity is 65%, the wind speed is 1.5 m/s at a height of 2 m, and the roughness height zo is 0.02 cm. Determine the open water evaporation rate using the combined method (mm/d). [10] Determine the fraction of net radiation that is used in evaporation. [5] Explain what happens to the energy from net radiation that is not used in evaporation. [5] [20 points]