A high resolution application of a stormwater management model (SWMM) using genetic parameter optimization

Gerald Krebs, Teemu Kokkonen, Marjo Valtanen, Harri Koivusalo, Heikki Setälä

Research output: Contribution to journalArticleResearchpeer-review

Abstract

Low Impact Development (LID) tools and green infrastructure approaches have been developed and applied to mitigate the urbanization impacts on increasing runoff and pollutant washoff. The present work is the first part of a larger effort to simulate LID scenarios for a large scale urban catchment through up-scaling of high-resolution study catchments using the Stormwater Management Model (SWMM). In this study we present the setup, calibration, validation, and the results of a parameter sensitivity analysis of a high-resolution SWMM model for a highly urbanized small catchment located in Southern Finland. The homogenous subcatchments and associated narrow parameter boundaries, which are allowed by the high spatial resolution, result in insensitivity of SWMM to the fraction of impervious cover. The model optimization, using only the two identified key parameters ‘‘depression storage’’ and ‘‘Manning’s roughness n for conduit flow’’, yielded good performance statistics for both calibration and validation of the model.
Original languageEnglish
Pages (from-to)394-410
JournalUrban Water Journal
Volume10
Issue number6
DOIs
Publication statusPublished - 2013
Externally publishedYes

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Keywords

  • urban hydrology
  • SWMM
  • high spatial resolution
  • parameter sensitivity
  • parameter optimization

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