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Aquifers Properties: Specific Yield and Specific Retention

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Aquifers Properties: Specific Yield and Specific Retention In an aquifer with a water table (unconfined aquifer), the volume of water released from groundwater storage per unit surface area of aquifer per unit decline in the water table is known as the specific yield, S y . also known as the drainable porosity. Hydrologists divide water in storage in the ground into the part that will drain under the influence of gravity (called specific yield) and the part that is retained as a film on rock surfaces and in very small openings (called specific retention). The physical forces that control specific retention are the same forces involved in the thickness and moisture content of the capillary, fringe. fig.1
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The White Desert, Accretionary Wedge #37

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Mushrooms Image via Wikipedia The White Desert is located at the northern region of the Farafra Oasis . I had visited it within field trip to western desert. The white desert has been classified by government of Egypt as a natural protected zone in 2002 and covers an area of 3010 square kilometers. It's far 570 km from Cairo. The White desert is a unique geological phenomenon; where wind and water erosion sculptured their way through the soft chalk forming incredible shapes "Mushrooms". Along the road Baharia - Farafra, the main geological observations as many isolated hills and hillocks consisting almost of massive bedded, snow white chalk of Maastrichtian Khoman Formation. There are many fascinating geomorphologic feature accompanied the carbonate rocks of the plateau surface such as cave deposits and onyx,
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YES Network Africa Symposium 2011

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The YES Network is an international association of early-career geoscientists who are primarily under the age of 35 years and are from universities, geoscience organizations and companies from across the world. About the YES Africa Symposium I blog this event according to my opinions of the session i had participated in it online via Go To Meeting , i used twitter update to blog about this event, i arranged it chronologically. I hope this be useful. Twitter Hashtags for the event was #YESAfrica2011 Starting the event 1st day 8:30 Am Amel Barich from YES-Morocco talking about her PhD research
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