1D Manholes: Difference between revisions
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<li>'''K<sub>m</sub>''' is the user-defined manhole exit coefficient.
The resulting headloss value is then applied, when sub-critical flow is experienced, to the standard head loss equation, i.e. dh = K*V<sup>2</sup>/2g. Where K is the loss coefficient, V is the conduit velocity and g the gravitational constant. The equations used for the Engelund loss approach are provided below:
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[[File:Engelund Equations.PNG]]
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'''Figure 2: Example Model 1 Long Section'''
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The model was run with a steady inflow of 2m<sup>3</sup>s<sup>-1</sup>. The resulting losses from the 1 hour steady inflow simulation are presented in the following figure.
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[[File:Manhole Results 1.png]]
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[[File:Vp.PNG]]
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With other parameters defined in the section above. The calculated flow area in the manhole is 3.6m<sup>2</sup> and 1m<sup>2</sup> in the adjacent culvert whilst the flow is 2m<sup>3</sup>/s for both Q<sub>p</sub> and Q<sub>om</sub>.
Therefore, V<sub>m</sub> equals:
[[File:Vm1.PNG]]
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