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eng.hydraulic-jump Calculator
Calculates the sequent depth, energy loss, and length of a hydraulic jump from upstream Froude number and depth. The hydraulic jump converts supercritical flow to subcritical — it's used in stilling basins below dams to dissipate energy and prevent scour.
Inputs
V1 M S
Speed in a specified direction (m/s). Required for momentum, kinetic energy, and wave calculations.
Y1 M
Vertical extent downward, or thickness of a layer. For tanks: affects pressure at the base (P = ρgh).
Channel Width M
Horizontal extent perpendicular to the length.
Results
upstream Froude number Fr₁
Sample size or count used in the calculation.
sequent depth y₂ (m)
The computed depth.
downstream velocity V₂ (m/s)
Sample size or count used in the calculation.
head loss E_loss (m)
The decrease or degradation from the baseline.
y₂/y₁ = ½(√(1+8Fr₁²)−1)
Reference formula or conversion factor shown for context.
flow type
The classification or type assigned based on the inputs.