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.
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.
CHOOSING A TANK
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. Continue reading