This paper analyses the sensitivity of flood inundation due to levee
breach against breach model parameters. A parametric levee breach model
integrated into the 2D hydrodynamic numerical model Telemac-2D is used
to simulate a levee breach flood event at Wonji, Ethiopia. Levee breach
process parameters are systemically varied to find out their effect on
the modelled flood inundation.The analysis of the model results show
that the modelled flood inundation is sensitive to the final breach
dimensions and breach location. However, the parameters describing the
levee breach development have negligible influence on the modelled flood
inundation. This implies that final breach dimension and breach location
in an event of levee breach are the most important and decisive factors
affecting the resulting inundation of the flood plain and as such should
be given due consideration when creating flood inundation maps due to
levee breach modelled by employing parametric breach model.