Post 2014 Blogs

All Posts (27)

Oscillations in SWMM 5 and InfoSWMM

I made this example to show how oscillations occur for legitimate reasons and the best ways to test the oscillations in InfoSWMM and SWMM 5:
Oscillations due to downstream obstructions, downstream mixed solutions and downstream boundary conditions:
In this case the oscillation in some links is due to the culvert comparison which limits the flow based on the inlet equation.  You can see the flow…
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3 Types of Manholes in SWMM 5 and InfoSWMM

Subject:   3 Types of Manholes in SWMM 5 and InfoSWMM

 There are three types of interior manholes in SWMM 5 and InfoSWMM as regards water surface elevations above the Node Rim Elevation:

1st Excess Water leaves the Node as flooded water if the water surface elevation equals the Rim Elevation (Figure 1 and Gravity Mains),

2nd Excess Water is stored in the manhole as pressurized depth if the Node Surcharge Depth is used (Figure 2 and Force Mains)

3rd Excess Water is stored above the Node Rim Elevation (Surface Ponding and Figure 3)…

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