Answer Happy

3. Groundwater System (a) A confined aquifer is 20 m thick. Two observation wells are located 100 and 300 m respectively from the pumping well. Two observation wells indicate heads of 39.5 and 40 m. If the coefficient of permeability of the aquifer is 5.2 x 10-4 m/s, calculate the total daily flow through the aquifer and the diameter of the pumping well when the head at the well is 36.5 m. [8 marks] (b) A well is located in a 25 m confined aquifer of permeability 20 m/day and storage coefficient S = 0.005. Calculate the discharge if the well is being pumped and the drawdown at a distance of 75 m from the well after 20 hours of pumping is observed to be 0.75 m. [7 marks]