6-25. A rectangular channel 20 ft wide has a roughness coefficient n = 0.015. a. Determine the normal slope at a normal depth of 1.23 ft when the discharge is 200 cfs. b. Determine the critical slope and the corresponding normal depth when the dis- charge is 200 cís. c. Determine the critical slope at the normal depth of 1.23 it, and compute the corresponding discharge.

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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.