A well is constructed to pump water from a confined aquifer. Two observation wells, MW1 and MW2, are constructed at distances of 10 m and 100 m, respectively. Water is pumped from the pumping well at a rate of 0.8 m³/min. At steady state, drawdown is observed as 5 m in MW2 and 19 m in MW1. Note that drawdown is greater for well MW1 located closest to the pumping well. Determine the Transmissivity (cm²/s) if the aquifer is 40 m thick. (Please enter your answers with 2 decimals)

10. A single well pumps water from a horizontally infinite confined aquifer at a rate of 6 m³/day beginning at time t = 0. The aquifer has a transmissivity (T) of 50 m²/day and a storativity S of 0.0001. Use the Theis solution (eqs. 9.4.5-7) and Table 9.1 to calculate the drawdown in a monitoring well located 44 m from the pumping well after 10 days and after 90 days.

QUESTION 1 Calculate the transmissivity of an artesian aquifer that has a thickness of 5.5 m and is pumped at a rate of 1.52 m³/min. There are two observation wells located at 150 m and 280 m away with drawdowns of 0.8 and 0.72 m respectively. (15) QUESTION 2 An aquifer has T = 175 m²/day, S = 1.3 x104, and provides a flow of 20 L/s to a well. Find the drawdown at the two observation wells located 15 and 65 m from the producing well after 1 day, 2 months, 10 months and 2 years. (15)

ENVIRONMENTAL ENGINEERING ( Practice Questions)   a). Suppose a well 0.36m in diameter has been pumped at a rate of 3,000cu.m/day for a long enough time that steady-state conditions apply. An observation well located 30m from the pumped well has been drawn down by 1.0m, and another well at 120m is drawn down by 0.4m. The pumped well extends completely through an unconfined aquifer 60.0m thick. GIVEN: For an unconconfined aquifer, Q =      πK(h2c1 – h2c2) / [Ln(r1 / r2)] Determine the hydraulic conductivity, K. (7 marks)   (ii) Estimate the drawdown at the pumped well. State any assumptions made.                           b). A confined aquifer 40.0 m thick has two monitoring wells spaced 400m apart along the direction of groundwater flow. The difference in water level in the wells is 4.0m (the difference in piezometric head). The hydraulic conductivity is 40m/day. Estimate the rate of flow per meter of distance perpendicular to the flow.    C). Suppose the aquifer, which has a…