Harvest rainwater and use it in the home

Posted by: Saving Water SA (Cape Town, South Africa) – partnered with Water Rhapsody conservation systems – 01 June 2011

Now that winter is here it’s a good time to install a rainwater tank and reduce your home’s reliance on Cape Town’s precious water.

5000 litre tank used to supply home with harvested rainwater


A rainwater tank is a great way to make a difference to the environment and reduce your annual household water and sewerage costs.

It’s always a good time to install a rainwater tank, and now makes good sense given our winter rainfall pattern.

The average rainfall for Cape Town is approximately 600mm per annum. 10mm of rain on 100sqm of roof provides up to 1000 litres of stored water. A 100sqm roof will provide a whopping 60,000 litres a year.

Homeowners have the ability to make a great difference to the local water supply simply by installing a tank and system that will allow for the use of the stored water throughout their home and garden.


Contrary to belief you don’t need a big tank to make good use of harvested rainwater for your home.

The size of the tank is calculated using the roof catchment area, type of roof, number of people in the home, etc., and the tank can be as small as 1500 litres. Harvested rainwater is drawn down constantly and replenished at each rainfall. So it makes no sense to have 10000 litres of storage capacity when the roof size and rainfall cannot fill the tanks.

Aesthetics may be an important factor when deciding on a tank. Tanks are available in a number of different colours and styles with the most common, and most cost effective, being the vertical round tank that is placed above ground.

Water Rhapsody Rain Runner. Used to harvest clean water.

Systems used to harvest rainwater no longer require that the tank is positioned close or under a downpipe, or outside the lounge window. Tanks can now be unobtrusively positioned at the bottom of the garden, out of sight, with pipe work concealed underground.

Water Rhapsody offers a vast range of rainwater tanks for domestic or commercial use, starting from 260-litre through to 27000 litre tanks, including slimline and underground tanks.


Plumbing a rainwater tank into the house supply can be readily achieved for most established homes, but requires professional expertise.

Water Rhapsody offers their Grand Opus; a solution that ensures your home can run efficiently off an uninterrupted pressurized rainwater supply, with seamless transition to municipal water in the event of a sustained dry period.

With a Grand Opus the home would be assured of water at all times, even in the event of a water outage, for up to 2-days.

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