- Problem 1 A Well Having A Diameter Of 0 50 M And Dug In An Unconfined Aquifer Is Being Pumped And Is Delivering 0 025 M 1 (168.08 KiB) Viewed 55 times
Problem 1 A well having a diameter of 0.50 m and dug in an unconfined aquifer is. being pumped and is delivering 0.025 m³/s. The depth of water in the well is now 50 m that was 60 m when pumping was started. Two observation wells are installed at 7.5 m and 15.0 m distances from centerline of well being pumped. The water level in the well being 7.5 m from centerline of well is at depth of 55 m. Find the depth in the second observation well? Problem 2 A well of diameter 0.40 m is installed in a confined aquifer to its full depth of 100 m. Its radius of influence is 275 m. When pumped, the well delivers 0.05 m³/s at drawdown of 10 m. Find the coefficient of permeability of the aquifer? Problem 3 A 0.30 m diameter well is pumped at a rate of 500 gallons/min. Observations of drawdowns taken at 5.0 m and 20.0 m distances from the centre of the well were found to be 15.0 m and 1.50 m respectively. Determine the 'K' of the water bearing strata assuming that the thickness of the aquifer is 50.0 m? Problem 4 Observational wells were drilled in a cone of depression of artesian (confined) well, being pumped at the rate of 0.05 m³/s. The drawdown in the observational wells at 5 m and 15 m were found to be 8.5 m and 3.5 m respectively. Calculate 'K' of the aquifer if the average thickness of the aquifer is 80 m? Problem 5 A well is sunk to the whole of an unconfined aquifer and is pumped at a constant rate. The drawdowns in the observational wells are measured and the following data is generated. Static water depth = 25 m Q = 0.05 m³/s Diameter of well = 1.0 m Drawdown at 10.0 m = 1.50 m Draw down at 20.0 m = 1.00 m Find out the coefficient of permeability 'k', the diameter of circle of influence and the drawdown in the well. Problem 6 A well with a radius of 0.30 m completely penetrates an unconfined aquifer with k=25 m/day and water table height from impermeable strata at the bottom of aquifer is 45 m. The well is pumped so that the water level in the well remains at 35 m above the bottom of the aquifer assuming that pumping has no effect on water table height at r = 300 m. What is steady state well discharge?