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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.
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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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