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Hydrology & Irrigation

Critical Yield of Open Well and Recuperation Test

Discharge per...

Question

Discharge per unit drawdown at an open well is known as

A

specific storage

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B

specific capacity

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C

specific yield

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D

specific retention

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Solution

The correct option is B specific capacity
1. Specific Storage - the volume of water removed from a unit volume of a confined aquifer for a unit drop in hydraulic head.

2. Specific capacity - discharge per unit drawdown in the well

3. Specific yield - The ratio of the volume of water that a given body of soil will yield by gravity to the volume of the body itself

4. Specific retention - The ratio of the volume of water that a given body of soil will hold against the pull of gravity to the volume of the body itself

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Q. The discharge per unit drawdown at the 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 5 m diameter open well has a discharge of 40 cumecs under a depression head of 3 m. What will be the discharge (in cumecs) from a 8 m diameter open well in the same aquifer under a depression head of 2 m?

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.

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