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ESE 2021 Technical Quiz || Environmental Engineering || Groundwater and Well Hydraulics

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Question 1

Consider the following statements:
1). Infiltration galleries are placed along the river beds at a depth 4 to 6 m.
2). The draw-down for the in infiltration galleries is more than that for radial wells
3). clogging of pipe pores in infiltration galleries is less than that for radial wells.
4). The cost of extracting unit volume of water is more in case of infiltration galleries as compared to radial wells.
Which of these statements is/are correct?

Question 2

Assertion (A):In a strainer type tube well, strainer pipes are surrounded by wire mesh.
Reason (R): This prevents the fine particles from entering the well pipe.

Question 3

As recommended by Sichardt, the radius of influence is

Question 4

Calculate the coefficient of permeability of an unconfined aquifer, if the yield from the aquifer is 285 liters per day. The water table depth at a distance of 2m and 22.5 m from the 3.45 m and 5 m respectively.

Question 5

Water is pumped out through an unconfined aquifer 4.5 m thick and hydraulic conductivity 0.685 m/day. The drawdown in two observation wells 4m and 15 m away is observed to be 0.68m and 0.23m respectively. Calculate the percentage increase in discharge if the hydraulic conductivity of the aquifer increases to 1.185 m/day and the drawdown in the same observation wells increases to be 0.75 and 0.28m respectively.
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Jun 4ESE & GATE CE