Rainwater Harvesting means the immediate collection of rainwater running off a surface upon which it had fallen directly. Falling rainwater can provide one of the purest forms of water that is available. It is the result of a natural distillation process and can only be contaminated by airborne particles and manmade air pollution. Most modern societies have facilities that provide drinking water by exploiting rivers streams and lakes, most of which are already heavily polluted by industries and soil contamination.
Rainwater harvesting presents big opportunity especially in areas with very high rainfall or drier areas where potable water is scarce on unfit to drink.
- In a city like Durban utilisation of a 150 square meter roof can provide up to 180 000l of harvested rainwater per annum.
- In Gauteng the utilisation of a 1000 square meter warehouse roof can provide up to 800 000l of harvested rainwater per annum, enough to satisfy the demand for water of the whole warehouse.
By installing effective systems and sufficient storage capacity, savings will not only be achieved by reducing municipal water consumption it will solve many properties's stormwater problems by reducing stormwater runoff.