Determining the Optimal Tank Size for Rooftop Rainwater Harvesting in Jordan: An Evaluation of Potential

Abstract

This study aimed to assess the potential of rainwater harvesting from rooftops in Jordan, recognizing its significance in mitigating water scarcity. Using the Ripple Method and Water Balance Model, data on daily rainfall rates and total rooftop area were collected and analyzed for each of Jordan’s 12 governorates to estimate the potential benefits and identify specific regions with high potential. The study found that Jordan has a total potential for rooftop rainwater harvesting estimated at 23.74 Mm3/year, with Irbid and Amman having the highest potential for water harvesting, with estimated potentials of 7.754 Mm3/year and 8.453 Mm3/year, respectively. Moreover, the optimal tank sizes for storing rainwater that would be used only to flush toilets were determined to be 2.7 Mm3 and 2 Mm3 per household in Ajlun and Irbid Governorates, respectively. These findings may provide valuable insights for policymakers, water resource managers, and communities interested in sustainable water management strategies.