When waves propagate from deep water to shallow water, they transform. Extended mild slope equation includes wave transfon-nations such as refraction, diffraction, shoaling, reflection and dissipations due to bottom friction and wave breaking and harbour resonance. Extended mild slope equation can be applied to the rapidly,varying topographies through higher order bottom effetcs. In this study, extended mild slope equation has been reduced to Helmholtz equation and solved with finite volume method. Numerical model has been applied to the Fethiye Bay in the Mediterranean Sea in Turkey.