Nodes enable the modelling of actions or measurements that occur in a river system. For example water can be added, extracted, stored, recorded, or have a change in ownership. A node can be used to represent things that actually happen over a large physical area but which, for modelling purposes, occur at a single point, such as extractions from a group of off-takes.
Table 1 summarises the core purpose of each of the node types in Source. Each node has distinct behaviour in both the Flow Phase and the Ordering Phase of the model and these behaviours are described in the corresponding section for each node. These sections deal mostly with water quantity. In addition, each of the nodes have some influence on the routing of ownership and constituents (where enabled). These behaviours are covered in the corresponding chapter of this document (Ownership, Catchment Water Quality Processes - SRG for constituents).
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