Hydrogeology of Wadi Al-Yammaniyah, Saudi Arabia |
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| Authors: | Bashir A. Memon Asadullah Kazi Abdulghafar S. Bazuhair |
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| Affiliation: | Senior Hydrogeologist, P. E. LaMoreaux and Associates, Inc., P.O. Box 2310, Tuscaloosa, Alabama 35403.;Faculty of Earth Sciences, King Abdulaziz University, P.O. Box 1744, Jeddah, Kingdom of Saudi Arabia. |
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| Abstract: | Quaternary alluvium, ranging in thickness from a few to 100 meters underlain by Precambrian rocks of metamor-phic and igneous origin, constitutes an important source of ground water in Wadi Al-Yammaniyah, Saudi Arabia. The purpose of this report is to assess the hydraulic properties, quality of water, and estimated change in storage in waterbearing rocks in the area. The results of eight pumping tests carried out in hand-dug, large-diameter wells, indicate that the hydraulic conductivity of the alluvial aquifer ranges from 5.6 × 10−5 to 1.85 × 10−3 cm/second (3.36 × 10−5 to 1.11 × 10−3 m/minute) and that its storativity varies from 8.23 × 10−2 to 1.17 × 10−1. The aquifer is replenished by sporadic but intensive rainfall of short duration. The present withdrawal is only about 10 percent of the annual recharge which is estimated at 52 × 106 m3. It is shown that there is a substantial potential for the future development of potable ground water which would be required for the development of the area. |
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