Mechanical & Civil Engineering
Hydraulic Jump Energy Dissipation Calculator
Compute the sequent depth and energy loss of a hydraulic jump in a rectangular open channel.
Your inputs
Change any value to update the result instantly.
Sequent depth (y2)
1.682 m
Upstream Froude number
2.71
Head loss in jump
0.491 m
Depth ratio y2/y1
3.36
What this calculator does
Hydraulic Jump Energy Dissipation Calculator: Applies the standard civil and geotechnical relationship for this problem so the flow, pressure, settlement or capacity can be worked out from measured site inputs.
What your result means
The headline figure is the hydraulic or geotechnical quantity implied by your site inputs. Compare it against the design criteria in the applicable code before acting on it.
Formula and working
y2 = y1/2 × (√(1+8Fr1²) − 1)
- 1
Collect the inputs
Upstream depth (y1) = 0.5 m; Upstream velocity (v1) = 6 m/s
- 2
Apply the formula
y2 = y1/2 × (√(1+8Fr1²) − 1)
- 3
Result
Sequent depth (y2) = 1.682 m
Frequently asked questions
Symbols and assumptions
- depth1
- Upstream depth (y1) (m)
- velocity1
- Upstream velocity (v1) (m/s)
- • Steady-state, single-phase conditions are assumed unless the page says otherwise.
- • Site inputs (soil properties, flow, roughness) come from the user's own survey or testing.
Sources and review
Reviewed 2026-09-22 · Next review 2027-09-22
- • This is an educational estimate for learning and checking, not a design deliverable.
- • Real design must follow the governing code or standard for your jurisdiction and be reviewed and signed off by a qualified engineer.
- • Safety factors, load combinations and material certification are the responsibility of the designer, not of this page.
Important limitation
This is an educational estimate based only on the values and formula shown. Verify current rates, rules, units, and professional standards before relying on the result. It is not personalized financial or investment advice.
Report a mistake or request an improvement
Tell us if a formula, unit, explanation, or result needs attention. Your message will include this calculator’s name and page.
Related calculators
Broad-Crested Weir Discharge Calculator
Calculate the discharge over a broad-crested weir given head and crest width.
Culvert Inlet vs Outlet Control Capacity Calculator
Estimate culvert discharge capacity under inlet control and outlet control conditions for sizing.
Sediment Settling Velocity (Stokes & Hazen) Calculator
Estimate the terminal settling velocity of a sediment particle using Stokes' or Hazen's law.
Surge Tank Height & Oscillation Calculator
Estimate the maximum water surface upsurge in a simple surge tank after sudden load rejection.
V-Notch (Thomson) Weir Discharge Calculator
Calculate low-flow discharge through a triangular V-notch weir for a given notch angle and head.
Water Hammer (Joukowsky) Surge Pressure Calculator
Estimate the pressure surge caused by sudden valve closure in a pipeline using the Joukowsky equation.