Investigation of Supplying Water Requirements in Different Parts of a City through Rainwater Harvesting; a Case Study Bonab, Iran

Rainwater harvesting can help extremely to supply a part of the water requirements of arid regions such as Iran. In this study, the potential of Bonab city in usage of rainwater harvesting systems was investigated. For this purpose, surface areas of the various parts of the city were determined and using 13 years (2000-2012) average rainfall in different months, the volume of runoff that can occur at different parts of the city was calculated. The results showed that if total runoff of the city’s area be collected every month, 100% of public, commercial and industrial’s water requirements in the months Farvardin and Ordibehesht are provided. Also, some of the runoff in two months can be stored to compensate for the lack of the months Khordad to Mehr. Approximately, 100% of the water requirement of the months Aban to Esfand can be supplied through the runoff collected in these months. The domestic water requirement can be supplied by collecting runoff from yards and roofs of residential areas in the months Farvardin to Esfand. Also, the months Mordad and Aban can provide the lowest (0.59%) and the highest (43.25%) amount of this requirement. If the water requirement of each month be supplied by the rainfall of the same month, then 100% of the water requirement of city’s landscapes will be provided in all month except Tir and Mordad. Using the Farvardin to Khordad’ rainfall, in addition to providing the total water requirement of landscapes in these months, the lack of the months Tir and Mordad could also be provided.