if the median size of bed material of a natural channel is 1.2 mm, then the Manning's n coefficient for the channel is about 0.027 .a 0.041 .b 0.012 .C 0.035 .d

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Highway Drainage

Highway drainage is the process of extracting and regulating the excess surface water on the pavement by giving the desired slope. The construction of a highway drain helps to divert the water present on the surface, and sub-grade by the means of slope. Highway drainage systems are a necessary part of smooth functioning of traffic, since the highway drainage systems provide proper disposal of unwanted substances from the highways.