1. What is the Rainfall Recharge Formula?

The Rainfall Recharge formula calculates the amount of water that infiltrates through surface layers and percolates into the underlying hard rock sandstone aquifer during monsoon seasons. This is crucial for managing groundwater resources in semi-consolidated sandstone formations.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( Rss \) — Rainfall Recharge in Hard Rock Sandstone (m³/s)
• \( Acr \) — Area of Computation for Recharge (m²)
• \( Pnm \) — Normal Rainfall in Monsoon Season (m)

Explanation: The formula estimates groundwater recharge by multiplying the catchment area with normal monsoon rainfall and applying a factor of 6, which accounts for infiltration characteristics in hard rock sandstone formations.

3. Importance of Rainfall Recharge Calculation

Details: Accurate calculation of rainfall recharge is essential for sustainable groundwater management, aquifer replenishment assessment, and planning water resource allocation in hard rock areas with semi-consolidated sandstone.

4. Using the Calculator

Tips: Enter the catchment area in square meters and normal monsoon rainfall in meters. Both values must be positive numbers for accurate calculation.

5. Frequently Asked Questions (FAQ)

Q1: What is the significance of the factor 6 in the formula?
A: The factor 6 represents the recharge coefficient that accounts for infiltration characteristics specific to hard rock sandstone formations with minimal rainfall conditions.

Q2: How is Normal Rainfall in Monsoon Season determined?
A: It's typically calculated as the statistical average of rainfall measured over 30 years during monsoon months in a specific region.

Q3: What areas qualify as "Area of Computation for Recharge"?
A: This refers to the specific catchment area where water infiltration into groundwater aquifers is being calculated, typically defined by geological boundaries.

Q4: Are there limitations to this formula?
A: Yes, this formula is specifically designed for hard rock areas with semi-consolidated sandstone and minimal rainfall conditions, and may not be accurate for other geological formations.

Q5: How often should recharge calculations be updated?
A: Recharge calculations should be updated regularly, especially after significant land use changes or when updated long-term rainfall data becomes available.