If you are using Kinematic Wave Routing in SWMM 5 you can switch to Dynamic Wave if you have any issues with a continuity error. There is on potential issue, however, as you need to have an outfall in your dynamic wave model. You can get around this issue by adding a dummy isolated outfall but it would be better to have an actual outfall.
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| Adding a Dummy Outfall in SWMM 5 |
via Blogger http://www.swmm5.net/2014/01/dummy-outfall-for-dynamic-wave-models.html