I'm trying to use seep/w to model homogenous earthdam with internal crack I defined the crack zone as a very high permaebility compared with the coeficient of permeability of the dam and I used interface element to represent the crack in the model then I changed the thickness of the element to 1cm. the dam hight is 6.5m and I wonder if there is mesh size impact on the obtained results ? I want to know if I'm on the right track or i'm using the wrong software for my analysis? any advice would be appreciated