The largest environmental challenge that Jordan faces today is water scarcity. This scarcity attributed to climatic conditions, such as aridity and abundance of high solar radiation, and population pressure. Current use already exceeds renewable supply. Many methods have been suggested to increase the sources of water supply, one alternative source is rainwater harvesting. This paper aims at evaluating the importance of rainwater roof harvesting systems for domestic supply in Jordan. General domestic water storage patterns and design considerations of roof water harvesting systems have been addressed. Moreover, it estimates the maximum amount of rainwater, which may be collected in cisterns using roof catchment systems. Finally, recommendations to improve the quality and quantity of harvested rainwater have been provided.
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