Study of Optimized Sediment Rating Equation in Humid and Arid Climates

Suspended load is one of the most important factors in taking decision to create aquatic construction and to determine useful life of dams. Lack of long time measurements of erosion, as well as insufficient researches in this field, limit the access to trustable data and therefore we usually use estimating methods. Whereas sediment rating curve and its adjustment are used as basic methods for estimating suspended sediment load, in this research we used these methods for both of regions. To determine most appropriate method for estimating the suspended load in part of west and north of Iran, flow discharge and corresponding sediment discharge of 12 (6 arid and 6 wet gauges station were analyzed. results showed correlation coefficient in mean load equations is more than single-linear equations in both of wet and arid regions. In the other hand results showed Root Mean Square Error of MVUE factor is less than other Correction factors in both of wet and arid regions.