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Rainwater Harvesting Formula:
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Rainwater harvesting is the process of collecting and storing rainwater from surfaces like roofs for later use. It's an eco-friendly practice that helps conserve water resources and reduce dependency on mains water supply.
The calculator uses the rainwater harvesting formula:
Where:
Explanation: The formula calculates the potential volume of rainwater that can be harvested from a given surface area during a rainfall event, accounting for typical system efficiency losses.
Details: Rainwater harvesting helps conserve water resources, reduces water bills, decreases stormwater runoff, and provides an alternative water source for gardening, toilet flushing, and other non-potable uses.
Tips: Enter the collection area in square meters and rainfall amount in millimeters. The calculator will estimate the harvestable rainwater volume in liters.
Q1: Why is there a 0.85 efficiency factor?
A: The 0.85 factor accounts for typical system losses including evaporation, spillage, first flush diversion, and filtration losses.
Q2: What surfaces can be used for rainwater harvesting?
A: Roofs are most commonly used, but any impervious surface like driveways or patios can be utilized for rainwater collection.
Q3: How accurate is this calculation?
A: The calculation provides a good estimate, but actual harvestable water may vary based on roof material, gutter design, and system efficiency.
Q4: Can harvested rainwater be used for drinking?
A: With proper filtration and treatment, rainwater can be made potable, but additional treatment is required beyond basic harvesting systems.
Q5: What's the typical rainfall pattern in the UK?
A: UK rainfall varies by region, with western areas generally receiving more rainfall than eastern regions. Average annual rainfall ranges from 500mm to over 3000mm.