Estimation of transmition losses in Zangmar River

In rivers spatially ephemeral rivers، volume of water in downstream reduced due to transmission losses. Thus the modeling such process is important in water resources management and river engineering. In this study، using gene expression programming، transmission losses in zangmar River that is located in northwest Iran، based on observations input and output hydrographs in Mako and Poldasht stations has been calculated. After the introduction of various terminals and commen function in gene expression programming model، the output hydrograph in downstream stations were simulated. Statistical indices showed that the gene expression programming model predict output hydrograph acceptable so that the estimated output losses in comparison with the observed values is 7/4%.