The discharge from a fully penetrating well under steady state pumping in a confined aquifer is (1000A liters per minutes. The aquifer has a thickness of 20 m. The drawdowns observed at two wells located at 6 and 12 meters from the well are 3.0 m and 2.0 m respectively. Calculate the permeability of the aquifer. Show the data on the neat sketch.
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- A 30 cm diameter well penetrates vertically through an aquifer to an impermeable stratum which is located 18.0m below the static water table. After a long period of pumping at rate of 1.0m^3/min, the drawdown in test holes 14m and 40m from the pumped well is found to be 2.62m and 1.50m respectively. What is the coefficient of permeability of the aquifer? Express in meters per day. What is its transmissibility? Express in cubic meters per day per meter. What is the drawdown in the pumped well?A well 12‐in in diameter penetrates 108 ft below the static water table. After a longperiod of pumping at a rate of 350 gpm, the drawdowns in wells 57 ft and 148 ft from thepumped well were found to be 12 ft and 7.4 ft, respectively.(a) What is the transmissivity of the aquifer?(b) What is the approximate drawdown in the pumped well?Calculate the drawdown halfway between the two wells if the wells are 400 ft apart, the original groundwater table is 230 ft above the bottom of the aquifer, and the hydraulic conductivity of the aquifer is 2.0 ft/day. Each well is pumped at a rate of 250 gals/min.
- 3 wells are sunk in a confined aquifer in a straight line at 25 m intervals. If one end well is pumped at rate of 300 m3/day, the steady state drawdown in the other wells was found to be 3 m and 2 m. Find the aquifer transmissivity. If all the wells are pumped at the same rate of 300 m3/day, what is the minimum drawdown between the wells?Charyeong wants to determine the permeability of an aquifer. The aquifer has a 300 mm diameter test well that penetrates 27 m. below the static water table. After 24 hours of pumping at 61 liters/sec, the water level in an observation well 93.53 m. from the test well was lowered to 24.83 m. and the other observation well at 33.3 m. from the test well, was lowered to 23.02 m. Determine the coefficient of permeability of the aquifer in m/day.An artesian well with a radius of 0.75 meters was constructed to pump water from a source with a confining unit height of 30 meters. Two observation wells are 200 meters and 1,500 meters away from the test well with corresponding drawdowns of 9 meters and 3 meters at a steady state. Water is pumped at a rate of 432,000 L/day. a) The aquifer type for this problem is: b) The drawdown in the test well c) What is the value for the hydraulic conductivity d) The soil classification for the confining unit can be e) The transmissivity
- b) A 30-cm well fully penetrates an unconfined aquifer of saturated depth 25 m. When a discharge of 2100 lpm was being pumped for a long time, observation wells at radial distances of 30 m and 90 m indicated drawdown of 5 and 4 m respectively. Estimate the coefficient of permeability and transmissibility of the aquifer. What is the drawdown at the pumping well?The following data relate to a pump-out test: Diameter of well = 24 cm; Thickness of confined aquifer = 27 m; Radius of circle of influence = 333 m; Draw down during the test = 4.5 m; Discharge = 0.9 m^3/s.What is the permeability of the aquifer in mm/s? Choices: a. 2.15 x 10^-2 b. 4.5 x 10^-1 c. 93 X 10^-1 d. 1.6 X 10^-1The static level of water table in an unconfined aquifer was 30 m above the underlying impermeablestratum. A 150 mm diameter well, penetrating the aquifer to its full depth, was pumped at the rate of20 liters per second. After several weeks of pumping, the drawdown in observation wells 20 m and 50m from the well were 3.5 m and 2 m respectively, and the observed drawdowns were increasing veryslowly (B.Sc., DU, 2012).a) Assuming equilibrium conditions, estimate the hydraulic conductivity and transmissivity of theaquifer.b) Estimate the drawdown just outside the pumped well.c) What will be the yield of a 300 mm diameter well which will produce the same drawdowns justoutside the well and at the 50 m distance observation well in (2)? What would be the drawdown at anearer observation well?
- An 18-inch-diameter (~46 cm) well within an aquifer with a transmissivity of 1070 ft2/day (~100 m2/day) and a storativity of 7x10-2 is to be pumped continuously. What pumping rate should be used so that the maximum drawdown after two years will not exceed 20 ft (~6 m)?After 2 months of pumping, water levels stabilize with a head at well 1 of 132 ft and a head at well 2 of 143.5 ft. Transmissivity of the aquifer is 450 ft2/day. What is the discharge (gal/min)?You are asked to design a rectangular clarifier for a wastewater treatment plant. The clarifier is designed to settle 2,000 m3/day with an overflow rate of 32m3/m2-day. If the tank is 2.4 m deep and 4.0 m wide, what should the length and detention time be?