Being an arid area, rainfall in the Kingdom of Saudi Arabia is scarce and unreliable. Heavy rainfall sometimes occurs sometimes occurs for short spurts resulting in flash floods and surface runoffs mostly in the western and south western regions. Saudi Arabia, therefore, depends on four main water resources: Desalinated water from the sea, surface water in the mountainous regions, non-renewable ground water from fossil aquifers renewable ground water from alluvial aquifers and treated waste water.
The Kingdom of Saudi Arabia is the largest producer of desalinated water from the sea. The process of desalination, under the Saline Water Conservation Corporation produced 1.03 km3 of water in 2006 (SWCC, 2006). This water is mostly used in domestic and industrial used in the urban areas. It caters for up to 48% of the total urban uses (SWCC 2006). Some of the desalinated water is also exported. Reservoirs also hold approximately 10 million m3 of desalinated water for future use (SWCC, 2006).
The total non-renewable ground water
References: Department of Economical Studies and Statistics. 2006. Agricultural statistical yearbook.Ministry of Agriculture. Library of Congress. 2006. Country profile: Saudi Arabia, September 2006. Federal Research Division. Saline Water Conversion Corporation. 2006. Annual reports. Alamoud, A. and Aldakheel, Y. 2003. The importance of renewable water in agricultural development in Saudi Arabia (in Arabic). Presented at the Symposium on Water as a Strategic Challenge Facing Humanity. Ministry of Electricity and Water and Ministry of Higher Education, Riyadh. Aldakheel, Y. 2005. Water governance as part of IWRM in arid regions: a case study of Saudi Arabia. Seminar on Water Governance: Role of Stakeholders. ESCWA, UN. 14–15 November 2005. Beirut, Lebanon. General Statistics Authority. 2009. General population census. Ministry of Economics and Planning.