Calculators

HOW MUCH RAINWATER WILL I USE / WILL I NEED?

DID YOU KNOW

  • Every 1 square metre of roof area collects 1 litre of Rainwater for every 1mm of rain
  • Collection from one or two roof down pipes will gather an average area of 100 sq meters of roof on an average suburban house roof.

MAXIMISE YOUR RAINWATER COLLECTION

By collecting from your property’s main stormwater line (the pipe that connects all the interlinking pipes including all downpipes on your property) you can increase your rainwater collection area from 100m2 to 750 m2.

This means your TANKLESS® Underground Rainwater Storage Unit can maximise rainwater collection from a variety of sources, including your entire roof as well as paths and driveways. In doing so, this increases your rainwater collection capacity by 750%

So, for 1mm of rain – 750 litres of rainwater is collected.
For 10mm of rain – 7500 litres of rainwater is collected.

HOW MUCH WILL MY DRIP SYSTEM USE?

Drip systems are the most water efficient way of watering your garden.
Typically, drip systems emit 2 litres of water per hour per dripper x 3 drippers per metre.

For schools and commercial buildings, which have greater roof and other rainwater collection surface areas, naturally the rainwater collection capacity dramatically increases

Tip: If rain is forecast that week, water your garden in advance to maximise your collection capacity