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★★★★★
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Where this app stands in South Africa, updated 19 Oct 2026
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Version 1.8 is the largest update yet. New • Water surface profiles: a Profile tab on every channel computes gradually varied flow from a control depth by the direct step method • Specific energy, momentum and hydraulic jump in every result • Triangular and parabolic channels • Natural channels: solve for water elevation or bed slope, with separate overbank roughness • Design aids: most efficient section, freeboard and shear stress • A list of Manning's n values to choose from • Metric or English units on every form; typed values convert • PDF export and charts on every results screen • Messages under each field when an input is not valid Fixed • Froude number and hydraulic depth for rectangular and circular channels • Accuracy of depth solvers in English units • Rating curves that mixed feet and metres • Cross-section preview at zero or negative elevations Now requires iOS 15 or later.
Open Channel Flow Pro is a hydraulic calculator for open channels. It solves uniform and critical flow, draws the water surface profile, and reports energy, momentum and the hydraulic jump, for six channel shapes. It is made for civil and irrigation engineers, and for students of hydraulics. SIX CHANNEL SHAPES • Rectangular • Trapezoidal • Triangular • Circular • Parabolic • Natural: a cross-section you enter point by point, with separate overbank roughness WHAT IT CALCULATES • Uniform flow by Manning's equation: solve for discharge, depth, bed slope and more • Area, wetted perimeter, hydraulic radius, top width, velocity, Froude number and hydraulic depth • Critical depth, critical velocity and critical slope • Specific energy, momentum and the sequent depth of a hydraulic jump • Water surface profiles: gradually varied flow from a control depth by the direct step method • Rating curves of discharge against depth • Design aids: most efficient section, freeboard and shear stress MADE FOR REAL WORK • Metric or English units on every form; values you have typed convert • A list of Manning's n values to choose from • Charts on every results screen • PDF reports you can share or print • Worksheets that keep your calculations • Messages under each field when an input is not valid • Built-in documentation of the equations and terms • Works offline, on iPhone and iPad Disclaimer: results should be checked before they are used in design. Professional use is at the discretion of the user.