ABSTRACT
A rainwater harvesting system is an alternative water resource that collects and stores rainwater from rooftops, helping to smooth out variations in water supply and to facilitate sustainable water resources management. According to the Texas Commission on Environmental Quality rainwater can absorb gases such as carbon dioxide, oxygen, nitrogen dioxide, and sulfur dioxide from the atmosphere. For semi-arid regions experiencing rapid population growth, B. Stump et al. stated that rainwater harvesting is becoming increasingly important. Global warming drives sea-level rise by thermal expansion of seawater and by melting of ice caps, ice fields, and mountain glaciers. B. C. Bates et al. indicated that climate change is expected to affect various aspects of the environment, especially water resources. Water conservation is of great importance in an era of actual or potential climate change. Regarding algal growth suppression, Hunter states: High numbers of algae have been consistently experienced in the Bemm River Storage Basin over a number of years.
