Subject: Dual Drainage in SWMM 5
The purpose of the Dual Drainage tool in InfoSWMM is to create a major or street drainage network on top of an existing pipe or what is called the minor network in dual drainage. The created major network has a node (sometimes called the inlet node) on top of the existing minor network node connected by two OUTLET links. One outlet link takes the flow from the street and passes it to the minor network node, the second outlet link takes the surcharged minor network flow and passes it to the major network or street – the direction of flow is important (Figure 1). The general purpose of the Captured OUTLET is to use a head or depth equation to separate the street incoming flow into captured flow and bypass flow
Figure 1. Dual Drainage in General
Figure 2. How it looks in SWMM 5 with node, outlet and conduit elements.
Dual Drainage in SWMM 5
Subject: Dual Drainage in SWMM 5
The purpose of the Dual Drainage tool in InfoSWMM is to create a major or street drainage network on top of an existing pipe or what is called the minor network in dual drainage. The created major network has a node (sometimes called the inlet node) on top of the existing minor network node connected by two OUTLET links. One outlet link takes the flow from the street and passes it to the minor network node, the second outlet link takes the surcharged minor network flow and passes it to the major network or street – the direction of flow is important (Figure 1). The general purpose of the Captured OUTLET is to use a head or depth equation to separate the street incoming flow into captured flow and bypass flow
Figure 1. Dual Drainage in General
Figure 2. How it looks in SWMM 5 with node, outlet and conduit elements.
Topic: Example Dual Drainage SWMM 5 model
Comments
Subject: Dual Drainage in SWMM 5
The purpose of the Dual Drainage tool in InfoSWMM is to create a major or street drainage network on top of an existing pipe or what is called the minor network in dual drainage. The created major network has a node (sometimes called the inlet node) on top of the existing minor network node connected by two OUTLET links. One outlet link takes the flow from the street and passes it to the minor network node, the second outlet link takes the surcharged minor network flow and passes it to the major network or street – the direction of flow is important (Figure 1). The general purpose of the Captured OUTLET is to use a head or depth equation to separate the street incoming flow into captured flow and bypass flow
Figure 1. Dual Drainage in General
Figure 2. How it looks in SWMM 5 with node, outlet and conduit elements.
Topic: Example Dual Drainage SWMM 5 model
dual_drainage.inp Download this file
Outlets in SWMM 5 can have reverse flow
Outlets in SWMM 5 can have reverse flow (1) if the downstream head is greater than the upstream head (2), a flap gate (3) will prevent the flow reversal (4). An outlet can have both positive and negative flow as long as you do not prevent it by having a flap gate.
Topic: Example Dual Drainage SWMM 5 model
dual_drainage.inp Download this file