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The first line you created will be the Primary drainage linelink. If you create another drainage link line from the same node going to some other nodes, that will be created as Secondary drainage link.

Editing Drainage Link Properties describes the available drainage link properties in more detail, including the provision to specify flow-routing properties at each drainage link.

'Secondary' drainage links are optional. Secondary links are only required if you want to take advantage of the split flow functionality provided by MUSIC X, which is discussed next.

Split flows

MUSIC incorporates a facility to allow outflow components from source and treatment nodes to be routed via different flow pathways. This allows, for example, the routing of surface flows and groundwater/infiltrated flows via different treatment pathways.

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