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Specific Yield Formula:
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Specific Yield Percentage (in %) tells how much water is available for Consumptive use. It represents the ratio of water volume that can be drained by gravity to the total volume of the aquifer material.
The calculator uses the Specific Yield formula:
Where:
Explanation: The formula calculates the percentage of water that can be extracted from an aquifer by gravity drainage relative to the total volume of the aquifer material.
Details: Accurate Specific Yield calculation is crucial for groundwater resource assessment, well design, and sustainable water management practices. It helps determine the available water supply from aquifers.
Tips: Enter the volume of water drained by gravity and total volume in cubic meters. Both values must be positive numbers greater than zero.
Q1: What is a typical range for Specific Yield values?
A: Specific Yield values typically range from 0.01 to 0.3 (1% to 30%), depending on the aquifer material. Coarse materials like gravel have higher specific yield than fine materials like clay.
Q2: How does Specific Yield differ from Specific Retention?
A: Specific Yield represents the drainable water, while Specific Retention represents the water retained against gravity. The sum of Specific Yield and Specific Retention equals porosity.
Q3: Why is Specific Yield important in hydrogeology?
A: Specific Yield is essential for estimating groundwater storage, designing well fields, and managing aquifer recharge and discharge rates.
Q4: How is Volume of water drained by gravity measured?
A: It is typically measured through pumping tests, drainage experiments, or laboratory analysis of aquifer samples.
Q5: Can Specific Yield change over time?
A: Yes, Specific Yield can change due to factors like compaction, mineral deposition, or changes in water chemistry that affect pore spaces.