. Direct step method
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The document discusses the direct step method for determining water surface profiles for nonuniform open-channel flow. In nonuniform open-channel flow, the cross-sectional area, depth, and velocity vary along the channel. When the change in fluid depth along the channel dy/dx is much less than one, the flow is classified as gradually varied flow.
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. Direct step method
- 4. The direct step method is introduced to determine the water surface profile. For nonuniform open-channel flow, the cross sectional area, depth, and velocity vary along the channel.The flow is classified as gradually varied flow when the change of the fluid depth along the channel dy/dx is much less than one