Question

1. A well having 34 cm diameter penetrates 26m below the static water level. After 24 hours of pumping at 5500l/min, the water level in a test well at 95m away is dropped by 0.7m and at a well 38m away the drawdown is 1.2m. Determine A. Transmissibility of the aquifer(2pts) B. The drawdown in the main well if the distance from the center of the main well to the point in the aquifer where the draw down becomes zero is 250m(2.5pts) C. Specific capacity of the main well(2pts) D. The percentage reduction in the yield of the well if the diameter is reduced by half(3pts) E. Find the discharge of the main well if it only penetrates up to 13m below the water table. (7pts)

Answer #1

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A 30 cm well penetrates 45 m below the static water table. After
a long period of pumping at a rate of 1200 lpm, the drawdown in the
wells 20 m and 45 m from the pumped well is found to be 3.8 and 2.4
m respectively. Determine the transmissivity (=K*aquifer width) of
the aquifer. What is the drawdown in the pumped well?

A well 12 in dimeter penetrates 108 ft below the
static water table. After a long period of pumping at a rate of 350
gpm, the drawdowns in wells 57 ft and 148 ft from the pumped well
were found to be 12 ft and 7.4 ft respectively. What is the
transmissivity of the aquifer? What is the approximate drawdown in
the pumped well?

Q2.A 30 cm diameter well completely penetrates
completely penetrates a confined aquifer of permeability 45 m/day.
The depth of the aquifer which is equal to the length of the
strainer is 20 m. Under steady state of pumping, the drawdown at
the well was found to be 3.00 m and the radius of influence was 300
m.
Draw the aquifer with all the available information given
Calculate the discharge in m3/s
Note: R is the radius of influence, rw is...

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