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Rainwater Tank Size Formula:
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Rainwater tank size calculation determines the optimal storage capacity needed to collect and store rainwater from a roof catchment area, based on local rainfall patterns and collection efficiency.
The calculator uses the rainwater tank size formula:
Where:
Explanation: The formula calculates the volume of rainwater that can be collected from a roof area during a rainfall event, accounting for collection losses through the efficiency factor.
Details: Proper tank sizing is crucial for maximizing water collection, ensuring adequate storage during dry periods, optimizing investment costs, and meeting water demand requirements.
Tips: Enter roof area in square meters, average rainfall in millimeters, and collection efficiency (typically 0.8-0.9). All values must be positive numbers.
Q1: What is a typical efficiency value for rainwater collection?
A: Typical efficiency values range from 0.8 to 0.9, accounting for losses from evaporation, splash, first flush diversion, and system inefficiencies.
Q2: How do I measure my roof area?
A: Measure the length and width of your roof and multiply them. For complex roof shapes, break it down into simple rectangles and sum the areas.
Q3: What rainfall data should I use?
A: Use average monthly or annual rainfall data for your location from local meteorological services for the most accurate results.
Q4: Should I consider water demand when sizing my tank?
A: Yes, the calculated size represents maximum collection capacity. Your actual tank size should also consider your water usage patterns and dry period requirements.
Q5: Are there other factors to consider in tank sizing?
A: Yes, consider local regulations, available space, budget, intended water use, and climate patterns when finalizing your tank size.