The study area lies about 120 km to the east of Hail in northern Saudi Arabia, covering a surface area of some 350 km2. The paper considers its general hydrogeological situation including information on groundwater occurrence and movements within the Saq Formation, aquifer parameters, groundwater composition and variation. Heavy pumping from 186 deep wells with an average discharge of 1800 gallons/min has resulted in a continuous drop in the groundwater level since 1982 and its effects on major ionic composition for the period 1982–1989 are discussed.

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