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Consider the sample of sand having porosity 60%. If the specific retention of an aquifer containing this sand is 20%, then the specific yield of an aquifer will be:
- a)20 %
- b)40 %
- c)60 %
- d)80 %
Correct answer is option 'B'. Can you explain this answer?
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Consider the sample of sand having porosity 60%. If the specific rete...
Relation between specific yield (ηs), specific retention (ηr ) and porosity (η) is given by
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ηs + ηr = η
ηr = 20%
η = 60%
ηs = 60 - 20 = 40%
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Consider the sample of sand having porosity 60%. If the specific rete...
Calculation of Specific Yield
Porosity of sand = 60%
Specific retention of aquifer containing sand = 20%
To calculate specific yield, we need to subtract specific retention from porosity:
Specific yield = Porosity - Specific retention
Specific yield = 60% - 20%
Specific yield = 40%
Therefore, the specific yield of the aquifer containing sand with a porosity of 60% and specific retention of 20% is 40%.
Explanation
Porosity is the percentage of void space in a rock or soil. In this case, the sand has a porosity of 60%, which means that 60% of the volume of the sand consists of void space.
Specific retention is the amount of water that is retained in the pore spaces of a rock or soil after gravity drainage. In this case, the aquifer containing the sand has a specific retention of 20%, which means that 20% of the water in the aquifer is retained in the pore spaces of the sand after gravity drainage.
Specific yield is the amount of water that can be extracted from a rock or soil by pumping. It is calculated by subtracting specific retention from porosity. In this case, the specific yield of the aquifer containing the sand is 40%, which means that 40% of the water in the aquifer can be extracted by pumping.
Therefore, the specific yield is an important parameter in the assessment of groundwater resources, as it determines the amount of water that can be extracted from an aquifer by pumping.
Porosity of sand = 60%
Specific retention of aquifer containing sand = 20%
To calculate specific yield, we need to subtract specific retention from porosity:
Specific yield = Porosity - Specific retention
Specific yield = 60% - 20%
Specific yield = 40%
Therefore, the specific yield of the aquifer containing sand with a porosity of 60% and specific retention of 20% is 40%.
Explanation
Porosity is the percentage of void space in a rock or soil. In this case, the sand has a porosity of 60%, which means that 60% of the volume of the sand consists of void space.
Specific retention is the amount of water that is retained in the pore spaces of a rock or soil after gravity drainage. In this case, the aquifer containing the sand has a specific retention of 20%, which means that 20% of the water in the aquifer is retained in the pore spaces of the sand after gravity drainage.
Specific yield is the amount of water that can be extracted from a rock or soil by pumping. It is calculated by subtracting specific retention from porosity. In this case, the specific yield of the aquifer containing the sand is 40%, which means that 40% of the water in the aquifer can be extracted by pumping.
Therefore, the specific yield is an important parameter in the assessment of groundwater resources, as it determines the amount of water that can be extracted from an aquifer by pumping.
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Consider the sample of sand having porosity 60%. If the specific retention of an aquifer containing this sand is 20%, then the specific yield of an aquifer will be:a)20 %b)40 %c)60 %d)80 %Correct answer is option 'B'. Can you explain this answer?
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