This chapter presents a unique application of the EXTRAN block of EPA’s Storm Water Management Model (SWMM) and the development of a pollutant post-processing program. The program, in conjunction with the SWMM RUNOFF block, produced the time-variable pollutant concentrations required for a combined sewer overflow (CSO) abatement study of Newtown Creek, a tributary of New York City's East River. The approach provided a means to overcome the lack of a pollutant transport routine in the EXTRAN block. Also discussed is the simulation of an in-line storage weir using EXTRAN and the application of a CSO storage abatement model used to simulate off-line CSO storage facilities.

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