This paper analyzes the water security crisis confronting Riyadh, Saudi Arabia's capital, as population growth and infrastructure development strain available water resources. The city currently relies on a mix of groundwater (48%) and desalinated seawater (52%), but faces mounting pressure from a projected population increase to over 7 million by 2030. The paper identifies four key issues: unsustainable agricultural water demand, inadequate domestic supply capacity, underutilization of treated wastewater, and underdeveloped surface water resources. It concludes with six evidence-based policy recommendations, including agricultural sector reform, water conservation initiatives, expanded wastewater treatment infrastructure, aquifer protection, desalination technology advancement, and sustainable resource development in arid regions.
Riyadh is the capital of Saudi Arabia and serves as the country's primary economic and administrative center. As of 2014, the city had a population of 5 million people, accounting for more than 25% of the country's total population. As an important industrial city and national capital, Riyadh attracts numerous foreign immigrants; approximately 30% of the city's population are non-Saudi nationals. According to demographic projections, the city's population is expected to reach 6,415,000 by 2025 and 7,050,000 by 2030.
This rapid population growth, coupled with substantial investments in physical and social infrastructure, continues to exert significant pressure on the city's water facilities. Unless appropriate measures are implemented soon, Riyadh will face critical water security problems in the near future. The situation is further complicated by the fact that some aging water plants have ceased operations, creating additional strain on existing supply networks.
At present, Riyadh's water supplies come from two main sources. Local underground water contributes 48% of the city's water supply, while the remaining 52% comes from desalination infrastructure: one membrane-based reverse osmosis plant and two thermal multistage flash distillation plants located in the Persian Gulf. A new desalination plant is scheduled to open at Ras Al-Khair in the near future; however, this addition must offset production losses from aging facilities.
Water allocation differs by sector and user type. Desalinated water is primarily distributed to residential areas, while treated groundwater serves the agricultural sector and industries. Per-capita water consumption is notably high: as of 2011, consumption averaged 308 liters per person per day, reflecting both domestic use patterns and system inefficiencies typical of arid-region urban centers.
Several interconnected issues have worsened Riyadh's water security outlook. If no immediate solutions are implemented, the situation will deteriorate further.
Agricultural sector pressure: Water demand in Riyadh's agricultural sector is growing much faster than available renewable water resources. This mismatch means that existing aquifers are being exploited at an unsustainable rate. If this trend continues, non-renewable water reserves will be depleted rapidly, particularly since these aquifers are shared across Saudi Arabia, not limited to Riyadh alone. The government has introduced some measures—most notably through agricultural strategy reform—to reduce excessive groundwater extraction, but implementation remains incomplete.
Domestic supply vulnerability: Desalinated seawater currently meets part of Riyadh's growing domestic water demand. The government has invested billions of dollars in constructing, operating, and maintaining desalination plants. However, as urban population increases, groundwater supplies continue to decline, and water conservation remains inadequate, domestic water availability faces serious risk in the coming decades.
Underutilized wastewater recovery: Treated wastewater represents a significant potential resource for multiple purposes throughout Saudi Arabia. Yet the amounts actually used remain small, primarily due to slow construction of treatment plants and insufficient infrastructure for transporting treated wastewater to areas where it can be deployed effectively.
Underdeveloped surface and renewable resources: Surface water and renewable groundwater represent the most important natural water resources for long-term sustainability. Despite their importance, these resources have not been developed adequately in many regions. They suffer from neglect and operational inefficiencies, particularly in areas near wadis and in traditional oases.
Shortages of water in arid areas are expected; however, severe water scarcity will produce serious social and economic consequences, including health crises and potential economic collapse. To prevent or mitigate these outcomes, action must focus on the following priority areas:
"Policy recommendations for agricultural reform, conservation, and infrastructure development"
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