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Open Channel

This resource delves into open channel flow techniques for stormwater, irrigation, and waste water collection and treatment. Learn about steady, uniform, and uniform steady flows, hydraulic radius, Reynolds number, hydraulic section designs, Manning equation, weirs, V-notch, Cipolletti, hydraulic jumps, and tidal bore design concerns.

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Open Channel

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  1. Open Channel Storm water Irrigation Waste water collection and treatment

  2. Types of open channel flows – • Steady flow – when discharge (Q) does not change with time. • Uniform flow – when depth of fluid does not change for a selected length or section of the channel • Uniform steady flow – when discharge does not change with time and depth remains constant for a selected section. • cross section should remain unchanged – referred to as a prismatic channel

  3. Open Channel Flow Hydraulic radius: R = A/WP Do not include free surface in wetted perimeter.

  4. Open Channel Flow Re = V R/ Laminar flow: Re < 500 Turbulent flow: Re > 2000

  5. Best Hydraulic Section Design criteria

  6. Manning Equation USCS Q = (a/n) A R2/3 So1/2 a = 1.49 SI: a = 1.0

  7. Weirs Rectangular V-notch Cipolletti

  8. Hydraulic Jump Design concern Tidal bore

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