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Civil Engineering - Water Resources Engineering

Exercise : Water Resources Engineering - Section 1
41.
Pick up the correct statement from the following :
Perched aquifer is found in unconfined aquifer
The top surface of the water held in the perched aquifer, is known as perched water table
Perched aquifer is formed in unfined accquifer if an impervious layer exists
All the above.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
42.
In the derivation of Thiem's formula , the following assumption is not applicable
The aquifer is homogeneous and isotropic
Flow lines are radial and horizontal
The slope of the water surface is too small
The well has been sunk up to the surface of the unconfined aquifer
None of these.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
43.
A well penetrates to 30 m below the static water table. After 24 hours of pumping at 31.40 litres/minute, the water level in a test well at a distance of 80 m is lowered by 0.5 m and in a well 20 m away water is lowered by 1.0 m. The transmissibility of the auifer, is
1.185 m2/minute
1.285 m2/minute
1.385 m2/minute
1.485 m2/minute
1.585 m2/minute.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
44.
Shrouding is provided in
cavity type tube wells
slotted type tube wells
strainer type tube wells
perforated type tube wells.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
45.
The efficiency of a pump may be taken as
0.55
0.60
0.65
0.70
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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