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降雨；因為這個地區的人口越來越多，來自乾谷雨水的水源已經減少。 為了確保聖地泉水的穩定與純淨，沙特當局的「沙特地質調查（英语：Saudi Geological Survey）」設有「滲滲泉研究中心」，負責深入分析滲滲泉與其周邊集水區的地質狀態。水位的高低由水位歷程圖（英语：Hydrograph）測
sandstone. Geology of Saudi Arabia USGS pamphlet on gold, including early mining in Egypt and Arabia Website for the Saudi Geological Survey, which does a lot
Formation, with a review of the fish fauna, Bulletin of the Wyoming State Geological Survey (Laramie, Wyoming), 1984,, 63 2nd ed. J. Leidy, Notice of some remains
craters, Saudi Arabia. Journal of Geophysical Research. 2004, 109: E01008. Bibcode:2004JGRE..109.1008P. doi:10.1029/2003JE002136. US Geological Survey report
(PDF)存档于2011-07-14）. Czech Geological Survey. Mineral Commodity Summaries of the Czech Republic 2015 (PDF). Prague: Czech Geological Survey. October 2015: 373