1. What is Possible Recharge?

Possible Recharge refers to the gross recharge minus the natural recharge of the area. In hard rock areas with sandstone and minimum specific yield, it represents the maximum amount of water that can be artificially recharged into the aquifer system.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( R \) — Possible Recharge (Cubic Meter per Second)
• \( h \) — Water Level Fluctuation (Meter)
• \( A \) — Watershed Area (Square Meter)
• \( D_G \) — Gross Water Draft (Cubic Meter per Second)

Explanation: The formula calculates the potential recharge by considering the water level changes during monsoon, the catchment area, and subtracting the total water extracted from the system.

3. Importance of Possible Recharge Calculation

Details: Accurate recharge estimation is crucial for sustainable water resource management, especially in hard rock areas with sandstone where water retention is minimal. It helps in planning artificial recharge structures and managing groundwater resources effectively.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: What is specific yield and why is it minimum in sandstone?
A: Specific yield refers to the amount of water that can be drained by gravity from a saturated rock. Sandstone typically has lower specific yield due to its finer pore spaces and lower permeability compared to other aquifers.

Q2: How does water level fluctuation affect recharge?
A: Greater water level fluctuations during monsoon indicate higher potential for recharge as more water is available to percolate into the aquifer system.

Q3: What factors influence gross water draft?
A: Gross water draft depends on water extraction for domestic, agricultural, and industrial uses, as well as natural discharge from springs and seepage.

Q4: Are there limitations to this calculation method?
A: This method provides an estimate and may not account for complex geological variations, evaporation losses, or seasonal variations in water demand.

Q5: How can this calculation help in water management?
A: It helps identify areas with recharge potential, plan artificial recharge structures, and maintain sustainable groundwater levels in hard rock regions.