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Old   June 14, 2003, 00:03
Default roughness?
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Excuse me, please let me know. How much is the concrete numerical value of roughness?
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Old   July 17, 2003, 10:29
Default Re: roughness?
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The surface roughness depends more on surface finish than on material type, but for concrete pipes the equivalent sand-grain roughness varies in the range 0.3 to 3 depending on the surface texture.
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