Best answer: How do you calculate rainwater harvesting tank size?

Simple Rainwater Harvesting Formula – For every 1” of rain and 1,000 square feet of impermeable surface (roof, driveway, etc), about 620 gallons are generated. Meaning, you can capture about . 62 gallons per sq ft. To figure out the square footage of a surface, multiply the width x length.

How do you size a rainwater tank?

As a general rule of thumb, each square metre of roof space collects around 1 litre of water for every 1 millimetre of rainfall received. Using the calculation of (x) square metres of roof space available for connection to your tank multiplied by the amount of rainfall will help guide your decision.

How big should my rainwater harvesting tank be?

As a simple rule of thumb, for domestic system you will require about 1000 litres of storage per person.

What size water tank do I need?

For large properties with significant landscaping and a large home we recommend a minimum of 10,000 gallons. For smaller properties and homes that don’t have to worry about fire considerations, 2500-3000 gallons is a common tank tank that will give you plenty of water for daily needs.

How do you calculate water harvesting?

Rooftop RWH potential is estimated by multiplying the average annual rainfall, roof area and runoff coefficient. Runoff coefficient of the concrete roof is considered in the calculation which typically varies from 0.70-0.80. Fill the details below to calculate rainwater harvesting potential of your rooftop.

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What size water tank do I need for a family of 4?

For an average 4-person household, this works out to an average of 452 litres per day. Please note that this only includes a small amount of water for a very small courtyard style garden.

How big is a 20000 Litre water tank?


Capacity 20,000LT
Dimensions (mm) 3580 D x 2470 H
Inlet Height (mm) 2300mm
Supplied Accessories Inlet Strainer at 12 o ‘clock, 100mm Overflow at 12 o ‘clock
Fittings 1 x 40mm brass outlet

How much rain water comes off a roof?

Every square foot of roof space collects . 6 gallons of water in a 1 inch rainfall.

How big is a 5000 gallon tank?

5000 Gallon Plastic Water Storage Tank

Tank / Capacity Length Size
5000 Gallon Vertical Water Storage Tank 102″ 102″ L 102″ W 159″ H
5000 Gallon Vertical Water Storage Tank 102″ 102″ L 102″ W 158″ H
5000 Gallon Cone Bottom Tank 102″ 102″ L 102″ W 166″ H
5000 Gallon Cone Bottom Tank with Stand 102″ 102″ L 102″ W 166″ H
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