Total Time Above Rim Elevation at a Node in SWMM 5

Subject: Total Time Above Rim Elevation at a Node

1. Total Surcharge Time is the total time above the crown of the highest connecting pipe to a node.

2. Total Time Above Rim Elevation – this is the flooding time of the node and it includes flood time as well as ponding time. You can find this in the Junction Summary Report of InfoSWMM under the column Total Flood Time. The Total Flood Time is less than the Total Surcharge Time as the depth in the Node is higher.

A node is flooded if the node depth equals the node rim elevation – the flooded time is the total time excess flow coming out the top of the manhole,
A node is flooded if the node depth is above the rim elevation and you are using the Surface Ponding Option – the flooded time is the ponding time
A node is flooded if the node depth equals the node surchage elevation – the flooded time is the total time excess flow coming out the top of the surcharged manhole.

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Comments

Robert Dickinson October 6, 2012 at 5:36pm

The time flooding in SWMM 5 is pretty simple:

1. It is the sum of all time steps in which excess flow is coming out of the top of the manhole or

2. If you are using the ponding option then it is the time the surface pond has more than zero depth.

Figure 1. The time of flooding is the sum or the time steps in which the the flooding was above the rim elevation.

Figure 2. Conditions for which Flooding is Summed in SWMM 5.

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