trapezoidal channel of 6m and side slopes of 1:2 carries a flow of 60m^3/s at a depth of 2.5m.There is a smooth transition to a rectangular section 6m wide accompanied by gradual lowering of the channel bed by 0.6m  i.find the depth of the water in the rectangular section and the change in the water surface level ii.in the case the drop of the water surface level is tobe restricted to 0.3,what is the amount the bed must be lowered?assume no losses

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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.