<p>One of the distribution&rsquo;s factor of bridges are the &nbsp;scour around them.In order to reduce these effects, it is essential to understand its &nbsp;mechanism, Materials of riverbeds are&nbsp; 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 &nbsp;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&nbsp; 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&nbsp; have been proposed by researchers, however, since most of the equations are empirical but it may not always be&nbsp; a good accuracy, therefore, in this article we want to calculate the maximum scour depth and factors &nbsp;which are affecting this phenomenon &nbsp;&nbsp;by using numerical models of SSIIM.</p>