Equation For Recharge When Gross Water Draft Is Considered Calculator

Equation for Recharge when Gross Water Draft is Considered:

\[ R = (h \times SY \times A) - DG \]

Water Level Fluctuation (h):

Meter

Specific Yield (SY):

Unitless

Watershed Area (A):

Square Meter

Gross Water Draft (DG):

Cubic Meter per Second

Possible Recharge (R):

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1. What is the Equation for Recharge when Gross Water Draft is Considered?

The Equation for Recharge when Gross Water Draft is Considered calculates the possible groundwater recharge by accounting for water level fluctuations, specific yield of the aquifer, watershed area, and the gross water draft from the system.

2. How Does the Calculator Work?

The calculator uses the equation:

\[ R = (h \times SY \times A) - DG \]

Where:

\( R \) — Possible Recharge (Cubic Meter per Second)
\( h \) — Water Level Fluctuation (Meter)
\( SY \) — Specific Yield (Unitless)
\( A \) — Watershed Area (Square Meter)
\( DG \) — Gross Water Draft (Cubic Meter per Second)

Explanation: The equation calculates the net recharge by multiplying water level fluctuation, specific yield, and watershed area, then subtracting the gross water draft from the system.

3. Importance of Recharge Calculation

Details: Accurate recharge calculation is crucial for sustainable water resource management, groundwater modeling, and ensuring adequate water supply for various uses while maintaining aquifer health.

4. Using the Calculator

Tips: Enter water level fluctuation in meters, specific yield (unitless), watershed area in square meters, and gross water draft in cubic meters per second. All values must be valid positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is specific yield and how is it determined?
A: Specific yield is the ratio of water volume that a saturated aquifer will yield by gravity to the total volume of the aquifer. It's determined through laboratory tests or field measurements.

Q2: How is water level fluctuation measured?
A: Water level fluctuation is typically measured using monitoring wells equipped with water level sensors or manual measurements taken at regular intervals.

Q3: What factors affect groundwater recharge?
A: Factors include precipitation patterns, soil characteristics, land use, vegetation cover, topography, and human activities such as water extraction.

Q4: Why subtract gross water draft from the calculation?
A: Gross water draft represents the total water extracted from the system, which reduces the net available recharge for groundwater storage.

Q5: What are typical values for specific yield?
A: Specific yield values vary by aquifer material: sand (0.2-0.3), gravel (0.2-0.35), sandstone (0.1-0.3), and limestone (0.01-0.2).