There　are　different　ways　to　estimate　suspended　sediment　load　of　a　river.　The　conventional　sediment　rating　curve　model　has　been　used　widely　due　to　its　simplicity　and　required　parameters.　The　most　important　limitation　of　the　conventional　SRC　model　is　its　relatively　low　precision　and　underestimation　of　the　suspended　sediment　load　in　most　studies.　However,　in　this　study,　the　concept　of　SRC　model　segmentation　is　introduced　based　on　the　curve　slope　under　the　title　of　developed　SRC-S　model.　The　most　important　feature　is　the　simplicity　of　the　presented　application.　To　compare　the　conventional　SRC　and　the　developed　SRC-S　models,　data　from　two　hydrometry　stations　in　northern　Iran　were　selected.　Graphical　study　of　the　models　shows　that　the　developed　SRC-S　model　enjoys　more　fitting　precision　in　comparison　with　the　conventional　SRC　model,　and　also　has　improved　underestimation　error　of　suspended　sediment　load　in　higher　rates　of　river　flow　discharge.　Six　numerical　criteria　for　model　accuracy　(Nash-Sutcliffe,　root-mean-square　error,　and　mean　absolute　error,　difference　ratio,　efficiency　ratio　improved　and　index　of　agreement)　are　used　for　quantitative　comparison　of　the　results　of　conventional　and　developed　models.　Accordingly,　we　found　that　the　mentioned　criteria　have　improved　significantly　compared　to　the　conventional　model.　©　2020,　HARD　Publishing　Company.　All　rights　reserved.