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| Dammam aquifer | |
|---|---|
| Name | Dammam aquifer |
| Location | Eastern Province, Saudi Arabia; Persian Gulf coast |
| Type | Carbonate aquifer (limestone and dolomite) |
| Coordinates | 26°26′N 50°05′E (approximate) |
| Geology | Paleogene, Eocene limestones and dolomites; Rus Formation; Dammam Formation |
| Area | ~hundreds to thousands of square kilometers (regional aquifer) |
| Importance | Major regional groundwater resource for Dammam, Al Khobar, Dhahran, Qatif, Riyadh (via transport), and Eastern Province industries |
Dammam aquifer
The Dammam aquifer is a major regional carbonate groundwater system beneath the Eastern Province of Saudi Arabia and adjacent parts of the Persian Gulf margin, supplying municipal, industrial, and agricultural demand for cities such as Dammam, Al Khobar, and Dhahran. Formed in Paleogene to Neogene strata including the Dammam Formation and Rus Formation, the unit interfaces with petroleum-bearing strata of the Arab-D and Khuff Formation petroleum province and has been the focus of water-resource development, scientific study, and transboundary coastal management since mid-20th century.
The aquifer underlies the coastal plain of the Eastern Province near Dammam, extends inland beneath parts of Riyadh Province and borders the shallow shelf of the Persian Gulf. Exploration and abstraction have been driven by population centers such as Dammam, Al Khobar, Dhahran, and industrial nodes like the Saudi Aramco facilities at Abqaiq and Ras Tanura. Hydrologic interest ties into regional initiatives by institutions including the Ministry of Environment, Water and Agriculture (Saudi Arabia) and academic centers like King Fahd University of Petroleum and Minerals and King Saud University.
The Dammam aquifer occupies Eocene to Oligocene carbonate sequences correlated with the Dammam Formation and overlying clastic units; these sediments were deposited on the Arabian Plate during the Paleogene and were later modified by the Zagros orogeny-related flexure of the Persian Gulf basin. Aquifer porosity and permeability are controlled by carbonate lithology (limestone and dolomite), karst features, fracture networks, and sedimentary facies transitions linked to the regional stratigraphic framework used by the Saudi Geological Survey and petroleum geoscientists at Saudi Aramco. Confined and unconfined zones occur where impermeable evaporite or marl layers of the Rus Formation and other Neogene units create pressure heads exploited by artesian wells drilled during the 20th century water-supply expansion.
The lateral extent spans the Eastern Province coastal plain into parts of the Arabian Shield margin, with recharge primarily from episodic rainfall over the Asir-adjacent uplands, wadis draining from interior plateaus, and limited lateral inflows from higher Paleozoic and Mesozoic aquifers tapped beneath Riyadh. Recharge rates are low relative to extraction and are influenced by climatic patterns governed by the Arabian Peninsula monsoon variability and decadal shifts associated with El Niño–Southern Oscillation teleconnections. Coastal proximity to the Persian Gulf also creates a freshwater–saltwater interface whose dynamics are affected by abstraction and seasonal sea-level variations.
Groundwater from the system has been used for municipal supply to Dammam-Dhahran-Khobar metropolitan areas, irrigation in oasis and date-palm plantations linked to local agricultural initiatives, and industrial process water for facilities operated by Saudi Aramco and petrochemical complexes near Ras Tanura and Jubail. Management frameworks have involved the Ministry of Environment, Water and Agriculture (Saudi Arabia), regional water authorities, and research programs at King Fahd University to allocate well fields, implement artificial recharge trials, and interconnect with desalination and water-transport projects to relieve pressure on the aquifer.
Intensive pumping has resulted in drawdown, land-subsidence risks in some coastal sediments, and progressive intrusion of saline water from the Persian Gulf into freshwater zones, a process also documented in other Arabian carbonate aquifers studied by the United Nations Environment Programme and regional hydrogeologists. Salinization is exacerbated by poor well-spacing, aging well-casing standards overseen historically by provincial agencies, and changes in sea level linked to global sea level rise concerns. Ecological impacts include reduced baseflow to coastal sabkha and mangrove-like patches near Qatif and pressure on oasis agriculture historically supported by groundwater from nearshore springs.
Monitoring networks established by the Saudi Geological Survey, King Fahd University of Petroleum and Minerals, and industrial hydrogeology groups at Saudi Aramco include observation wells, geophysical logging, hydrochemical sampling, and isotopic studies employing isotopes such as oxygen-18 and tritium to determine groundwater ages and recharge sources. Numerical groundwater-flow models adapted from standard finite-difference and finite-element codes have been applied in collaboration with international centers like the United States Geological Survey and universities to simulate saltwater intrusion scenarios and test managed aquifer recharge (MAR) approaches using treated wastewater and stormwater capture.
Large-scale exploitation commenced after oil-driven urbanization in the mid-20th century when rapid growth of oil industry towns such as Dhahran and port centers like Dammam required reliable water supplies; early wells were drilled by petroleum-engineering teams from Saudi Aramco and consulting firms connected to British Petroleum and Gulf Oil era contractors. Subsequent decades saw expansion of well fields, the emergence of desalination as a complementary source by entities including the Saline Water Conversion Corporation, and policy shifts toward integrated water-resource management promoted by the Ministry of Environment, Water and Agriculture (Saudi Arabia) and academic research hubs to mitigate over-extraction and salinization trends.
Category:Aquifers of Saudi Arabia