A confined aquifer 12.0m thick has a piezometric surface 25.0 m above the bottom confining layer. Groundwater is being extracted from a 0.2 m diameter fully penetrating well. The pumping rate is 0.150 m3/min. The aquifer is relatively sandy and has a hydraulic conductivity of 230 m/d. Steady-state drawdown of 1.8 m is observed in a monitoring well 4.0 m from the pumping well. Calculate: i. The drawdown in the pumping well ii. The radius of influence of the pumping well

A 3.2 meter thick silty sand stratum intersects one side of a reservoir. The stratum has a hydraulic conductivity of 4 x 10-² cm/sec and exceeds along the entire 1000-m length of the reservoir. Compute seepage loss per month. el. 167.3 m Reservoir Clay Silty sand Observation well Clay 256 m - el. 165.0 m 3.2 m

A permeability pumping test was carried out in a confined aquifer with the piezometric level before pumping is 2.11 m. below the ground surface. The aquiclude (impermeable layer) has a thickness of 5.94 m. measured from the ground surface and the confined aquifer is 7.6 m. deep until it reaches the aquiclude (impermeable layer) at the bottom. At a steady pumping rate of 14.9 m³/hour the drawdown in the observation wells. were respectively equal to 1.61 m. and 0.43 m. The distances of the observation wells from the center of the test well were 16 m. and 32 m. respectively. Compute the depth of water at the farthest observation well. Compute the coefficient of permeability in mm/sec. Use 4 decimal places.

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