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Hydrology & Irrigation
Critical Yield of Open Well and Recuperation Test
The discharge...
Question
The discharge per unit drawdown at the well is known as
A
Specific yield
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B
Specific storage
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C
Specific retention
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D
Specific capacity
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Solution
The correct option is
D
Specific capacity
Specific capacity is the discharge per unit drawdown of a well and it measures efficiency of a well.
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Q.
Discharge per unit drawdown at an open well is known as
Q.
A 45 cm diameter well penetrates an unconfined aquifer of 30 m thick. Under the steady pumping rate for a long time, the drawdown at two observation wells 10 m and 20 m from the pumping well are 5 m and 3.5 m respectively. What will be the discharge (cubic metre per sec), if the permeability of the aquifer is given as 20 m/day.
Q.
Match List - I (Well hydraulics parameters) with List - II (Definition) and select the correct answer using the codes given below the lists:
List-I
A. Specific yield
B. Safe yield
C. Specific capacity
D. Field capacity
List-II
1. Discharge per unit drawdown of well
2. Same as specific retention
3. Measure of water that can be removed by pumping
4. Limit of withdrawal from well without depletion of the aquifer
5. Water-bearing capacity of aquifer
Q.
A well diameter 30 cm fully penetrated a confined aquifer of 25 m thick. After a long period of pumping at a steady state, the observations drawdown taken at 25 m and 75 meters distances from the centre of the main well are found to be 5 m and 1.5 m respectively. If the coefficient of permeability of the aquifer is 12 m/day, the steady state discharge from the main well would be ____ liter/min.
Q.
The force per unit charge is known as :
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