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
I think this column can be a useful forum for discussion, if there is a clear purpose. Simply showing photos is interesting, but is it educational/useful? Also, be sure not to use abbreviations your end-users might not be familiar with. For Example, what country is "KSA"? Also, a littlebackground on the geology of the are where samples are taken would be useful.
ReplyDeleteThank you for feedback! Well, I think the purpose is clear it is sharing knowledge. In your opinion How can showing sample photos be educational/useful?. I'm using abbreviations just for attracting readers not to sophisticate the information they're reading (KSA is a Kingdom of Saudi Arabia). I will mention little background about geology of the area, if it available.
ReplyDeleteI Think it Qz Feldspar Porphery
ReplyDelete