Rainwater Harvesting in Amman Imad T. Alhaj Ahmed, Head of Technical Inspection Unit, Municipality of Greater Amman- Jordan e-mail: imadah Abstract Rainwater harvesting is a conventional description of all large scale or small scale projects that aim at collecting of rainwater from surfaces and storing in reservoirs, dug wells as well as in tanks or containers for later use. Historically, rainwater harvesting was used to provide water for various domestic and irrigation uses. A number of distinctive historical examples that incorporate effective water harvesting systems survive in the country. Examples include the city of Petra, cisterns found in Umayyad desert palaces, the Crusader period castles such as those in Ajlun, Karak, and Shawbak, and traditional village houses of the nineteenth and early twentieth centuries. Recently, a letter from the prime minister office was issued to instruct municipalities all over the country to oversee that all newly constructed houses have rainwater-harvesting systems. Harvesting rainwater can provide a source of soft, high quality water, reduce reliability on other water sources and in many cases can be cost effective.  This paper discusses how these regulations can be implemented in the city of Amman, advantages of rainwater use as a supplemental water source, rain water catchments system components that can be practical for local conditions, quality of rainwater collected, the per capita water harvested for different housings in Amman, potential quantities of rainwater to be harvested per dwelling, in addition to the cost of production of water through water harvesting. Keywords: water harvesting, roof water harvesting systems, rainfall-runoff harvesting  Author Keywords: Rural water and wastewater management, Small water and wastewater systems, water management, water institutions, Palestine.