1. What is a Rain Volume Calculator by Month?

Definition: This calculator estimates the volume of rainwater collected based on the catchment area and monthly rainfall amount.

Purpose: It helps homeowners, farmers, and water management professionals determine potential rainwater collection volumes.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( V \) — Volume of rainwater (cubic meters)
• \( A \) — Catchment area (square meters)
• \( R \) — Monthly rainfall (meters)

Explanation: The catchment area is multiplied by the rainfall depth to calculate the total volume of water collected.

3. Importance of Rain Volume Calculation

Details: Accurate rain volume estimation helps in designing rainwater harvesting systems, irrigation planning, and flood prevention measures.

4. Using the Calculator

Tips: Enter the catchment area in square meters and monthly rainfall in meters. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: How do I convert rainfall from mm to meters?
A: Divide mm by 1000 (e.g., 50mm = 0.05m).

Q2: What's a typical roof catchment area?
A: A small house might have 100m² roof area, while larger buildings can have 500m² or more.

Q3: Does this account for collection efficiency?
A: No, typical systems have 80-90% efficiency due to evaporation and spillage.

Q4: How can I use this for annual calculations?
A: Multiply the monthly result by 12 or use average monthly rainfall data.

Q5: What if my area is in square feet?
A: Convert to square meters by multiplying by 0.0929.