Irrigation Engineering
Fundamental momentum equation for a hydraulic jump, is

D₁² - D₂² = (2q/g) × (V₁ - V₂)
D₁² + D₂² = (2q/g) × (V₂ - V₁)
D₂² - D₁² = (2q/g) × (V - V₂)
D₁² - D₂² = (2q/g) × (V₂ - V₁)

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Irrigation Engineering
As per Lacey’s theory, the silt factor is

directly proportional to square root of average particle size
inversely proportional to average par¬ticle size
directly proportional to average par¬ticle size
not related to average particle size

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