Water quality is processes are modelled in links and for certain node types (see Nodes SRG for more information on these).
Two approaches are provided for routing constituent movement through a reach. The first approach assumes the constituent is fully mixed within a reach. This approach can be appropriate where the user is interested in monthly or annual loads. A particle tracking method that is also provided routes the constituent at the velocity of flow (Close, 1996). This method is more accurate and is suitable where the user is interested in concentrations or loads at shorter time stepssmaller scales. More information on these is methods is available via Routing Type SRG.
...