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Water Tank Size Formula:
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The water tank size calculation determines the appropriate storage capacity needed for water tanks in New Zealand based on daily water demand and required storage days. This helps ensure adequate water supply during dry periods or for specific usage requirements.
The calculator uses the water tank size formula:
Where:
Explanation: The calculation multiplies the daily water consumption by the number of days you need to store water, providing the total storage capacity required.
Details: Proper water tank sizing is crucial for ensuring adequate water supply, especially in areas with seasonal rainfall patterns or for emergency water storage. Correct sizing prevents water shortages while avoiding overspending on unnecessarily large tanks.
Tips: Enter daily water demand in liters per day and the number of storage days required. Both values must be positive numbers. Consider typical NZ household water usage patterns and local climate conditions when determining storage needs.
Q1: What is typical daily water demand in NZ households?
A: Typical NZ household water usage ranges from 150-300 liters per person per day, depending on household size and water usage habits.
Q2: How many storage days should I consider?
A: This depends on your location and rainfall patterns. In many NZ regions, 14-21 days storage is recommended, but consult local guidelines.
Q3: Should I include rainwater collection in my calculation?
A: Yes, if you're relying on rainwater, consider average rainfall patterns and collection surface area in your overall water strategy.
Q4: Are there regulations for water tank sizing in NZ?
A: Some regional councils have specific requirements for rainwater storage, particularly in areas without town supply. Check with your local council.
Q5: Should I add a safety margin to the calculated size?
A: It's often recommended to add 10-20% extra capacity to account for unexpected dry periods or increased water usage.