Cistern Size Calculator

What is a Cistern Size Calculator?

A “Cistern Size Calculator” is a tool used to estimate the appropriate size of a cistern or rainwater harvesting tank for collecting and storing rainwater.

It calculates the cistern size based on factors like average annual rainfall, roof surface area, and water usage requirements.

Why use a Cistern Size Calculator?

• Using this calculator is important for several reasons:
• Sustainability: It helps individuals and communities utilize rainwater for various purposes, reducing the reliance on municipal water sources.
• Resource conservation: Efficiently capturing and storing rainwater contributes to water conservation efforts.
• Financial savings: Properly sizing the cistern ensures that collected rainwater meets water usage needs, potentially reducing water bills.

How to use a Cistern Size Calculator:

1. Input the average annual rainfall in your area (in inches).
2. Input the surface area of the roof that will collect rainwater (in square feet).
3. Input the estimated water usage per year (in gallons).
4. Click the "Calculate" button.
5. The calculator estimates the cistern size in gallons and determines if it's sufficient for your water usage.

Example calculation:

If you input an average annual rainfall of 36 inches, a roof area of 1,000 square feet, and water usage of 30,000 gallons per year, the calculator may estimate that a cistern with a size of approximately 28,200 gallons is sufficient for your water usage.

Please note that this is a simplified example, and actual cistern size may require more precise calculations, considering factors like seasonal variations in rainfall.

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