Leakage is infiltration or slow moving water through the soil mass. Leakage losses from dams have a large proportion of water losses in the agricultural sector. Create leaks in the soil dam, causing water loss, reducing the stability of the dam and the creation of health risks. In this respect, analyzing and seepage of soil dam is one of the first step and the most important issues in the design of dams that are considered by professionals. Sufficient knowledge of the basic rules of geotechnical leakage allows to the professionals to managing the appearing of serious problems in analysis and selects the best type of control system to avoid Leakage. Up to now, many efforts of researchers and scholars in communication about the effect of leaking and its controlling in soil dam have been studied. In this study, changes in the slope of the dam was evaluated in a laboratory model, and the results showed that by reducing the slope of the output rate on other side the dam will rises. Then obtained data from dimensional analysis by using SPSS statistical software analyzed and the obtained relations of software was compared with relations of dimensional analysis and finally good results have been obtained. (C) 2015 IASE Publisher All rights reserved.