3. A 30 cm well completely penetrates an unconfined aquifer of saturated depth 40 m. After a long period of pumping at a steady rate of 500 liters per min., the drawdown in two observation wells 25 and 75 m from the pumping well were found to be 3.5 and 2.0 m respectively. Determine the transmissivity of the aquifer [2.5]. What is the drawdown at the pumping well? [2.5] Objective: Understand well hydraulics and pumping test.