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Piecewise routing allows you to specify how K varies with flow. If x=1 then K must always be less than or equal to the time-step. In BigMod routing, the highest value of K is found in the travel time relationship, and the reach should be subdivided into sufficient divisions such that the highest value of K for each division is less than half the time-step.
Wetland Link
This link is used to connect storages in a wetland, or a wetland to a river. These links use a hydraulic model. There are different types of wetland link to reflect differences in hydraulic properties - eg. conveyances, weirs, pumps and culverts. Once a wetland link has been specified, double click it to configure it using the wetland link feature editor (Figure 8).
Figure 8. Link (Wetland, Configuration)
Link rating curve
Rating curves are used to describe the physical characteristics of the reach and convert a flow into a level, ie. they produce an output of level. The piecewise linear editor allows you to define relationships with respect to water level, discharge rate, reach width and dead storage. You can define multiple rating curves for a reach, each scheduled to commence on a particular date.
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