EROSION AND TRANSFER OF SedimentARY MATERIALS OCCUR UNDER SPECIAL CONDITIONS, AND EFFECTIVE FACTORS OF THIS PROCESS SHOULD BE RECOGNIZED. ALSO, NEW TECHNIQUES AND MODELING AND CONSTRUCTING NEW WATER SUPPLIES AND THE WAY OF UTILIZING THE WATER FACILITIES BUILT WITH LARGE FUNDS CAN BOTH DIRECTLY AND INDIRECTLY AFFECT THE CONTROL OF EROSION AND SedimentATION. STUDYING THE RIVER SedimentATION REGIME IS SIGNIFICANT IN MANY ASPECTS. THE AMOUNT OF Sediment ENTERING LAKES DEPENDS ON THE CHARGES AFLOAT OR AT THE RIVERBEDS FLOWING INTO THE LAKE. STUDYING THE REGIME OF THE RIVER Sediment DETERMINES EROSION STATUS OF UPSTREAM LANDS AND THE AMOUNT OF POLLUTION IMPORTANT IN MANY SOCIAL AND ECONOMICAL TERMS. FOR INSTANCE, ECOLOGICAL DISCUSSIONS, IMMIGRATIONS AND SO ON CAN BE MENTIONED. ALSO, THE FORMATION SENSITIVITY CAN BE SURVEYED BY STUDYING THE RIVER Sediment. THE BEHAVIOR AND SedimentATION STATUS OF RIVERS DETERMINES THE FLOODWATER STATUS OF RIVERS.ZAYANDEHROOD IS THE MOST IMPORTANT RIVER OF THE CENTRAL IRANIAN PLATEAU. THE MAIN BRANCH OF ZAYANDEHROOD, SPRINGING FROM KUHRANG, CONSISTS OF MANY SUBSIDIARY BRANCHES THAT PROVIDE THE WATER OF THE MAIN BRANCH. ZAYANDEHROOD IS IMPORTANT BECAUSE THIS RIVER IS THE WATER PROVIDER OF DIFFERENT INDUSTRIES AND MOREOVER, THIS RIVER PROVIDES THE WATER FOR AGRICULTURE INDUSTRY OF THIS AREA. THUS, THE RELATED Sediment AND POLLUTION CAUSES PROBLEMS IN ALL OF THESE SYSTEMS. IN THIS ARTICLE, IT IS TRIED TO INVESTIGATE THE Sediment CHARGE AND THE SedimentATION REGIME STATUS OF THE MAIN BRANCHES OF ZAYANDEHROOD USING A 23-YEAR PERIOD OF STATISTICS.