please tell me what geotextiles are and how they are used in dams as filters.?
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Geo-textile is a woven or non-woven fabric used to help bridge soils and stabilize them.  The most likely use would be between two layers of soils with differing particle sizes.  If used in the construction phase a slurry of soil and water may be pumped to the dam site and the geo-textile might be used to retain the soil and let the water drain leaving the soil to build the dam.
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First layer should be polypropylene then the next layer should be wool the polypropylene will repel water away from your feet the wool will act like an insulator
91533
you use mirifi 140-n filter fabric
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You can describe different types:\n\nhttp://www.aecom.yu.edu/ehs/Industrial%20Hygiene/Fs_Fibergls.htm\n\nhttp://www.clarkcraft.com/fiberglasscovering.php3
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the barriers prevent constuction wastes from leaching into neighboring soils
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Refers to graphics filters
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The is no simple single solution to preventing water pollution.  The sources are many depending upon the location and the ground water.\n\nThe sites below have much information on preventing home, agricultural and industrial pollution of water:
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See if these help\n\nhttp://www.pslc.ws/macrog.htm\n\nhttp://www-classes.usc.edu/engr/ms/125/MDA125/polymers_files/frame.htm
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There is a computer program called "Circumventer" that gets around filters.  That's all I know about it.  I guess you could find it if you searched.
102205
A gravity dam is a dam which stops the water through its weight.\n\nThey are simple to build but are only good for small dams. You just find the location where you want the dam and throw a few million tons of concrete into that area until it's enough to stop the flow of water.\n\n\nAnother type of dam would be an arch dam like Hoover Dam. Instead of using the dam's weight to hold back the water, it's shaped like a horseshoe and is actually wedged against two mountains.
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There are no set values for either the ingredients or the percentages of composition for water based wall putties.\n\nWhite cement, gray cement, polymers and plastic resins, various chemicals and mineral fillers (including plaster of Paris and gypsum) have all been used.  Sometimes pigments are added.\n\nSome of these putties are designed to stop water seepage and others are not.
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i assume you're talking about a filter?  mesh size has to do with the size of the particles the filter will trap.  although the affect on flow is pretty negligent, technically speaking, the smaller the mesh size, the more it will reduce flow, and the more particles it will trap.
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There are a couple of different fibers being used.\n\nKevlar by DuPont, Spectra by Honeywell, Aramid by Aramid and various combinations of the fibers woven together to form hybrid weaves.
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You might be refering to this:\n\nhttp://textileinfo.com/en/tech/imada/kennrou/page08.html\n\nMore on the subject can be found with a web search.
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Try here:\n\nhttp://www.saltwateredge.com/PROD/SG5C/YOZ01
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Some info at http://www.aquapurefilters.com/contaminates/165/toc.html and at http://www.stateoftheart.it/toc-2.htm
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given that they are rich in minerals and nurients from active stream deposition, there most common use is for farming and agricultural research. \n\nThe Canterbury Plains of New Zealand are a classic example of alluvial plains where extensive farming is carried out and also agricultural research from the nearby Lincoln University in Christchurch.