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Standard Step Method

Standard Step Method. Standard Step Method. Direct Step method is not suitable if we want to determine the flow depth at specified locations or if the channel is non-prismatic (i.e., channel cross section and/or bottom slope vary with distance)

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Standard Step Method

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  1. Standard Step Method

  2. Standard Step Method • Direct Step method is not suitable if we want to determine the flow depth at specified locations or if the channel is non-prismatic (i.e., channel cross section and/or bottom slope vary with distance) • The standard step method is a suitable method when we want to determine the flow depth at specified locations/ channel is non-prismatic/channel cross sections are available only at some specified locations. • HEC-RAS is based on the standard step method.

  3. Standard Step Method • The flow depth for a specified discharge in a given channel at section 1 (distance ) is known; we want to determine the flow depth at distance (section 2). • (Eq. 6-22) • 6-22 equation may be solved by trial-error, Newton-Raphson or bisection methods. (Choudhry, 2008)

  4. Example • A trapezoidal channel having a bottom slope of 0.001 is carrying a flow of . The bottom width is 10.0 m and the side slope are 2H to 1V. At the downstream end, a control structure raises the water depth to 5 m. Determine the water surface level at 1,2, and 4 km upstream of control structure. The Manning n for the flow surface is 0.013, and the elevation of the channel bottom at the downstream end is 0.0.

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