Early hydrologic and hydraulic numerical modeling of urban drainage systems focused on the minor system (i.e. storm sewer only). Over the past three decades there has been increased interest in the concurrent evaluation of the conveyance capacity of the major system (i.e. overland flow-roadways). More and more, these two systems are being modeled dynamically, using a linked approach known as dual drainage modeling. Dual drainage modeling allows for an improved assessment of the deficiencies in both systems, through integrated assessments which consider the interaction between the two systems.Of key interest in dual drainage models is the representation of inlet capture functions (roadway catchbasins and ditch inlets) since these intrinsically link the two often-parallel flow conveyance systems. The accurate representation of these features is critical, given the potential implications for basement flooding, surface ponding or flooding, and the development of appropriate drainage system designs. This paper describes various methods of modeling these functions and assesses them under different conditions, using models that had been developed for several urban communities. The relative benefits and drawbacks of each method are given and discussed, along with associated considerations for minor and major system design in dual drainage modeling.

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