Abstract

The Storm Water Management Model (SWMM) Version 5 has recently been released by USEPA. This version is the first major update to SWMM since 1988, and it has generated a high level of interest among the entire SWMM user community. SWMM5 includes a utility program to convert older SWMM format datasets to the new SWMM5 data format, which facilitates migration to the new version. As users test SWMM5 against SWMM4, there can be some discrepancies between the hydrographs generated from the two versions running the same application. This chapter presents a study that (i) compares the hydrographs in terms of flow pattern, peak flow depth/rate, and timing, generated from the two versions to evaluate the compatibility of SWMM4 and SWMM5, and (ii) compares both simulated results to field data to evaluate the accuracy of simulated results from the two versions if a discrepancy exists between two model simulated results. The comparison results indicate that both versions agree with each other and generally match the field data although some differences between simulated and observed data exist.

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