Hydraulics and Fluid Mechanics in ME
Froude number is significant in

Supersonics, as with projectile and jet propulsion
All of the listed here
Simultaneous motion through two fluids where there is a surface of discontinuity, gravity forces, and wave making effect, as with ship's hulls
Full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc.

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Hydraulics and Fluid Mechanics in ME
The discharge over a rectangular weir, considering the velocity of approach, is (whereH1 = H + Ha = Total height of water above the weir, H = Height of water over the crest of the weir, and Ha = Height of water due to velocity of approach)

(2/3) Cd × L. √2g [H13/2 - Ha3/2]
(2/3) Cd × L. √2g [H15/2 - Ha5/2]
(2/3) Cd × L.√2g [H1 - Ha]
(2/3) Cd × L.√2g [H12 - Ha2]

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