The subject of sediment transport has been noticed by engineers for years. Several methods had been applied for sediment issues whose results are various empirical equation offered by experts. Every of these equations are gained based on climate or laboratory conditions in different places in the world and they have different factors for determining transporting sediment amount, therefore, in most of these equations some graph and equations are offered by researchers for simplifying various factors. Evaluation of I
1
and I
factors in Chang et al. (1967) equation in different references showed some errors on it. After scrutiny of different references and use of FORTRAN program, integrals and graphs of I
1
and I
factors of this equation are corrected.
2
2
کلید واژگان :
Chang et al. (1967) equation, central Alborz Rivers, empirical equations, Sediment transport, Iran
