Specific Yield When Possible Recharge and Gross Water Draft Is Considered Calculator

Specific Yield Formula:

\[ SY = \frac{R + DG}{h \times A} \]

Possible Recharge (R):

m³/s

Gross Water Draft (DG):

m³/s

Water Level Fluctuation (h):

Watershed Area (A):

m²

Specific Yield (SY):

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1. What is Specific Yield?

The Specific Yield refers to the volume of water that a saturated rock or soil will yield due to gravity drainage to the total volume of the rock or soil. It is a crucial parameter in hydrogeology for understanding water storage and movement in aquifers.

2. How Does the Calculator Work?

The calculator uses the Specific Yield formula:

\[ SY = \frac{R + DG}{h \times A} \]

Where:

\( SY \) — Specific Yield (dimensionless)
\( R \) — Possible Recharge (m³/s)
\( DG \) — Gross Water Draft (m³/s)
\( h \) — Water Level Fluctuation (m)
\( A \) — Watershed Area (m²)

Explanation: The formula calculates the ratio of total water input (recharge + draft) to the product of water level fluctuation and watershed area, providing the specific yield value.

3. Importance of Specific Yield Calculation

Details: Accurate Specific Yield estimation is essential for groundwater resource management, aquifer characterization, and sustainable water extraction planning. It helps determine the available water storage capacity of aquifers.

4. Using the Calculator

Tips: Enter Possible Recharge and Gross Water Draft in m³/s, Water Level Fluctuation in meters, and Watershed Area in m². All values must be valid positive numbers with Water Level Fluctuation and Watershed Area greater than zero.

5. Frequently Asked Questions (FAQ)

Q1: What is the typical range of Specific Yield values?
A: Specific Yield typically ranges from 0.01 to 0.35, depending on the aquifer material. Coarse materials like gravel have higher values, while fine materials like clay have lower values.

Q2: How does Specific Yield differ from Specific Retention?
A: Specific Yield is the drainable water volume, while Specific Retention is the water retained against gravity. Their sum equals porosity.

Q3: Why is water level fluctuation important in this calculation?
A: Water level fluctuation represents the change in aquifer storage and is crucial for determining the volume of water available for extraction.

Q4: What factors affect Specific Yield values?
A: Grain size distribution, particle shape, packing arrangement, and degree of compaction significantly influence Specific Yield values.

Q5: How is Specific Yield used in practice?
A: It's used in groundwater modeling, well design, determining safe yield of aquifers, and planning sustainable groundwater development projects.