# Manning equation

## Manning equation

[′man·iŋ i‚kwā·zhən]
(fluid mechanics)
An equation used to compute the velocity of uniform flow in an open channel.
References in periodicals archive ?
This is the Manning equation that is a problem where the analyst solves the normal height in rectangular open-channel-flow.
In this research, to calibrate the numerical model, the flow rate at a distance of 20 meters from intake downstream was calculated using the Manning equation. The amount to the speed was obtained 2.3 meters per second.
In this study, the mathematical model was calibrated using Manning equation with accuracy of 8.5 percent.
where H is the total water depth as H = h + [zeta] and [[tau].sub.x] and [[tau].sub.y] are bottom friction terms represented by the Manning equation. The equations can be written in the following form, where n is the Manning coefficient:
The Manning equation , which was introduced about a century ago, attempts to capture the essential features of these factors.
Despite the straightforwardness of the Manning equation, one difficulty arises in determining the Manning coefficient n.
This may mean more money or it may mean scrapping equipment programmes in order to fund the manning equation. I don't really care how the resources are found but I know that unless this is put right an Army that has never been defeated in the field will be humbled by incompetence.
The Manning equation is widely used because of its simplicity and accuracy and is expressed as
The Manning equation is also combined with the continuity equation (Equation 6.6) as follows
Flow velocity also can be estimated from the Manning equation:
To calibrate the results one meter intake gate opening height in discharge 34.5[m.sup.3]/s was compared with Manning equation. To improve the accuracy of output results, it was determined that to conduct meshing in a separate section that a total of 381,520 cells were used and formed for Gotvand intake (Figure 1).
The effect of roughness is included in the Manning equation
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