In addition to Emma the ...

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In addition to Emma the following can be used for estimating flood:
SMS, WMS, HEC-RAS, HEC-HMS, PCSWMM Professional 2D, Carlson Civil Suite and etc.

These software can be used according to your scope of work/study, for instance catchment delineation you may use Archydro tool or WMS. As for rainfall modelling you can use HYFRAN for probabilty and which distrubtion fit for your data.

Anyhow, I would appreciate if you write more info about your project/study area, will be glad to help.