A concrete lined channel is to be constructed. For concrete in this case take Manning’s n to be 0.014s/m1/3 The slope of the ground surface is 1 in 450. The design discharge is 8.5m3/s. The channel is to be designed with the optimum hydraulic section, but the exact dimensions and profile of the channel are yet to be determined. Calculate the optimum hydraulic section for a trapezoidal channel and sketch the section with the key dims. Shape of section Area of flow Wetted perimeter Hydraulic Radius Surface Width Hydraulic mean depth Trapezoid: half of a hexagon 1.732D2 3.463D 0.500D 2.309D 0.750D

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Time and time related variables in engineering

Time is the event progression starting from past to present and then, future statistically. The time-related variable is any particular value in relation to time to assess its changes on a specified (XY) plane.