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One of the distribution’s factor of bridges are the scour around them.In order to reduce these effects, it is essential to understand its mechanism, Materials of riverbeds are erosion, But it depends on the severity of erosion in a way that the riverbed is covered with Granist, it takes years to erosion while the Rivers with sand bed have maximum depth within a very short time, In addition to the land and rivers is the erosion which is one of the most important factors, Hydraulic factors also play an important role in the occurrence of this phenomenon, for Bridge design with high reliability and in a economically way requires accurate estimation of the maximum scour depth around the foundations. This important factor will be calculated by using Empirical equations which have been proposed by researchers, however, since most of the equations are empirical but it may not always be a good accuracy, therefore, in this article we want to calculate the maximum scour depth and factors which are affecting this phenomenon by using numerical models of SSIIM . key words: Scour, erosion, numerical model of SSIIM.

Survey of Behavior of cylindrical and square piers by using SSIIM software under effects of Scour