A Case in Support of Continuous Modeling for Stormwater Management System Design
Stormwater management systems for new urban development have been traditionally designed and analyzed with the aid of computer models employing design storm events [such -as the Soil Conservation Service (SCS) temporal distribution], rather than continuous modeling using long term historical rainfall data and associated frequency analyses. It has generally been accepted that the latter method provides a more rigorous and realistic design; however, the differences in the results (i.e. designs) generated by the two methods have not typically been understood during the planning and design process. This chapter describes a case study in the Town of Milton (Sixteen Mile Creek Watershed) in which, based on a unique opportunity, both methods were applied in the analysis and preliminary design of end-of-pipe stormwater management facilities. The different flow and storage regimes generated by the alternate methods are highlighted, along with a number of modeling and physical factors which are considered to contribute to the differing results.
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