Category: Formulas

Back water based on Manning

Back water curve based on dividing in short parts. Cross-section based on Trapezoid Preconditions: turbulent flow and steady flow. Spreadsheet for online calculations. Sometimes the spreadsheet does not load, this because it is an external website. So don’t worry and

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Critical Depth, Trapezoid

Critical depth, trapezoid. Problem in calculating the critical depth with the formula is that the width (B) is changing with the water depth. So to find the critical depth, you have to look for the lowest H in the excel

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Critical Depth, rectangle, Froude number

Critical depth, rectangle Preconditions: cross section is a rectangle Spreadsheet for online calculations. Sometimes the spreadsheet does not load, this because it is an external website. So don’t worry and try later. For Ipad cookies should be set on. Ipad

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Equilibrium depth based on Chezy

Equilibrium depth based on Chezy. So Sf=Sb=Sy Cross-section based on Trapezoid Preconditions: turbulent flow, steady flow and uniform flow. Spreadsheet for online calculations. Sometimes the spreadsheet does not load, this because it is an external website. So don’t worry and

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Equilibrium depth based on Manning

Equilibrium depth based on Manning. So Sf=Sb=Sy Cross-section based on Trapezoid Preconditions: turbulent flow, steady flow and uniform flow. Spreadsheet for online calculations. Sometimes the spreadsheet does not load, this because it is an external website. So don’t worry and

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Discharge / Flow rate

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Colebrook-White and Darcy Weisbach

                     

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General pressure

    F p = —  [Pa = N/2m]     A F = Newton Force                    [N] A = Area on which the force acts    [m2] 

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Pressure Head

           p y = ——  [m]         r·g p = Pressure              [Pa=N/m2] g = Earths gravity= 9,81  [m/s2] r   = Density of liquid     [kg/m3] r fresh water  

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Velocity Head

 u2  —  = Velocity Head [m] 2·g u = Velocity              [m/s] g = Earths gravity= 9,81  [m/s2]

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