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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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Accretionary Wedge #38: Back to School

In response of Anne Jefferson questions for Accretionary Wedge #38 : If you are a current or future student… what do you want to know about life and careers in the geosciences? Are there things you aren’t getting to learn or do in classes that you think are important? What sort of experiences do you want to get out of school and how do you think school can or should help you prepare for a career? My respond here focus on, the method of studying geology. It's helpful to study how particular branch of geoscience are developed, like how continental drift theory are become the most accepted theory, but it's not necessary to study how seismic investigation are developed thorough the time. Students need to know how to interpret a seismic section; not to know who developed that branch of science so the large introductions of any subject in collage is like wasting the time. How is this branch of science work? why it useful? and how can i use it? that what i think is  important in stud...
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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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