ABSTRACT
The availability of water is a concern around the world. Researches have reported that rainwater harvesting can promote significant water savings for residences in different countries. A study performed by Herrmann and Schmida (1999) in Germany showed that the potential of potable water saving in a house might vary from 30% to 60%, depending on the demand and roof area. In Australia, Coombes et al. (1999) analysed 27 houses in Newcastle and concluded that rainwater usage would promote potable water saving of 60%. Ghisi et al. (2006) have stated that the potential water saving of water harvesting in 62 Brazilian cities ranges from 34% to 92%, with an average potential for potable saving of 69%.
