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3 cards from this section. Quick, good the night before a test.
What is the formula to calculate the area of a trapezoidal channel?
Think about the shapes involved in a trapezoid.
Define wetted perimeter.
Consider what boundaries are touched by the liquid in an open channel.
What formula represents the hydraulic radius?
Remember the relationship between area and wetted perimeter.
True or False: The wetted perimeter only includes the bottom width of a trapezoidal channel.
Think about the dimensions of the full channel.
A trapezoidal channel has a bottom width of 8 meters and side slopes of 2:1. Given a flow depth of 2.5 meters, calculate the area, wetted perimeter, and discharge using Manning's equation.
Pay attention to depth and slope when calculating.
A circular pipe has a diameter of 1.2 meters and is flowing at a depth of 0.4 meters. Derive the area of flow, wetted perimeter, and evaluate the discharge rate. What if the diameter were reduced by half?
Use trigonometric relationships for the circular portion.
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