Abstract

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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