Routing Files

A routing interface file stores a time series of flows and pollutant concentrations that are discharged from the outfall nodes of the drainage system model. This file can serve as the source of inflow to another drainage system model that is connected at the outfalls of the first system. A Combine utility is available on the File menu in EPA-SWMM 5.1 that will combine pairs of routing interface files into a single interface file. However, this option is currently unavailable in GeoSWMM, but the users can generate these files after exporting the model input file for EPA-SWMM 5.1 and then by performing model simulation in EPA-SWMM 5.1. This combining utility allows very large systems to be broken into smaller sub-systems that can be analyzed separately and linked together through the routing interface files.

Fig.168: Workflow of the Combine Utility in EPA-SWMM 5.10

A single GeoSWMM run can utilize an outflows routing file to save results generated at a system's outfalls, an inflows routing file to supply hydrograph and pollutograph inflows at selected nodes or both.