In the case of large floods in which the 1D drainage has failed then you need a 2D model if you want to simulate the movement of the overland flood water through the city. However, it is undeniable that large storm events do occur and can flood large portions of an urban enviroment. The vast majority of the time you would not need to use a 2D model to route the flows in a stormwater, sanitary or combined sewer network if you perfoming a continuous simulation. If the manhole or inlet floods then another 1D street element can be used to route the flows downstream to the next inlet. 1D is fine for most urban and surburban modeling because the drainage or conveyance networks are closed pipes or contained open channels and you should be primarily concerned with getting the rainfall, snowfall, subcatchment characteristics, subsurface hydrology, RDII inflow and network geometry correct.
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