Allocate a subcatchment’s flows among several nodes
This is an idea from CDM Smith == I have an engine feature idea that has occurred to me at various times but never acted on. Today I was discussing an InfoWorks model with a junior colleague. It would clearly help us in this model to be able to allocate a subcatchment’s flows among several nodes, whether identically or according to specified proportions. In this case, we’re filling out an existing model that previously had all 10” and larger pipes in town to now include all the 8” as well, tripling the size of the model. We’re basing new subcatchments on census blocks. While that’s quite adequate for the model’s purpose, there are considerably fewer blocks than manholes. This isn’t an issue in the downstream parts of the model, but is particularly noticeable at the upstream-most catchments, where we have the choice of loading at the upstream end (potentially overloading the first few pipes), downstream (leaving dry pipes), or in the middle (causing both problems). Of course we could delete the most upstream pipes or further refine the subcatchments, but functionality that allowed allocation of a subcatchment among multiple inlets would improve the modeled load distribution without adding otherwise unneeded complexity.
There is the ability to drain a subcatchment laterally to multiple links in InfoWorks ICM, would this be a close enough representation? When looking to split subcatchment flows across multiple nodes, this is usually achieved by splitting the subcatchments so there is one available for each node which is to be drained to.