Chapter 6, Problem 6.4.5P

A 1-m diameter well penetrates vertically through a confined aquifer 30 cm thick. When the well is pumped at 113 m³/hr, the drawdown in a well 15 m away is 1.8 m, in another well 50 m away, it is 0.5 m. What is the approximate head in the pumped well for steady state conditions and what is the approximate drawdown in the well? Also compute the transmissivity of the aquifer and the radius of influence of the pumping well. Take the initial piezometric level as 40 m above the datum.

a 45-cm well in an unconfined aquifer of saturated thickness of 48 m yields 701 lpm (liters per minute) under a drawdown of 4m at the pumping well. Assuming a radius of influence of 605 m, a. what is the hydraulic conductivity of the aquifer, in m/day? b. what will be the drawdown 200m from the well? c. what will be the piezometric head 400m fron the well?

1. A 10-in. diameter well is drilled to the bottom of an unconfined aquifer. The water table is originally 500 ft above the bottom of the aquifer whose hydraulic conductivity is known to be 0.25 ft / day. If 100 gal / min is pumped from the well, what will be the equilibrium depth of the water in the well if the radius of influence is 1000 ft? How much drawdown should be expected at a distance of 250 ft from the well.

An unconfined aquifer is 10 m thick and is being pumped so that one observation well placed at a distance 76 m shows a drawdown of 0.5 m. On the opposite side of the extraction well is another observation well 100 m from the extraction well, shows a drawdown of 0.3 m. Assume the coefficient of permeability of 50 m/day. a.) What is the discharge f the extraction well? b.) Suppose the well at 100 m from the extraction well is now pumped. Show with a sketch what this will do to the drawdown. c.) Suppose the aquifer sits on an aquaclude that has a slope of 1/100. Show with a sketch what this will do to the drawdown.

18. A well that pumps at a constant rate of 0.5m/s fully penetrates a confined aquifer of 34 m thickness. After a long period of pumping, near steady-state conditions, the measured drawdowns at two observations wells 50 and 100 m from the pumping well are 0.9 and 0.4m respectively. a) Calculate the hydraulic conductivity and transmissivity of the aquifer. b) Estimate the radius of influence of the pumping well c) Calculate the expected drawdown in the pumping well if the radius of well is 0.4m

Part 2 please

Consider a confined aquifer with a thickness of 12 m and hydraulic conductivity of 20 m/day. This aquifer is fully penetrated by a pumping well having a radius of 0.4 m and is operating at a discharge of 550 m3/day. Calculate the drawdown under steady-state condition in the pumping well and at a point located 41 m away from the well. Assume the radius of influence of the pumping is 310 m.

TELEGRAM Q1: A 30cm diameter well penetrates vertically through an aquifer to an impermeable stratum located 18.0 m below the static water table. After a long period of pumping at a rate of 1.2 m3/min, the drawdown in test holes 11m and 35 m from the pumped well is found to be 3.05 and 1.62m respective. What is the hydraulic conductivity of the aquifer? Express in meters per day. What is its transmissivity? Express in cubic meters per day per meter. What is the drawdown in the pumped well?

Question 19 Yuri wants to determine the permeability of an aquifer. The aquifer has a test well 300-mm in diameter with two observation wells. A pumping test was conducted for 24 hours with the discharge being held constant at 5,696.1 m^3/day. The first one, 89.64 meters from the test well, has a draw-down of 0.72 meters. The second one, 47 meters from the test well, has a draw-down of 1.14 meters.The static water table penetrates the well to a depth of 29 meters. Determine the radius of influence of the aquifer in meters. Round off to three decimal places.