How to calculate Sediment Transport Index (STI) in Arc GIS?

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Liem Nguyen Duy

1- Calculate the flow accumulation surface from DEM

2- Run the Slope tool and get the slope of the watershed.

3- Convert slope's unit from degree to radian.

4- Run the sediment transport index formula in the raster calculator. The syntax is:

Power(“FlowAccumulationArea”/22.13,0.6) * Power(Sin(“Slope_Extrac1”/0.0896),1.3)

Amit Bera

Thank you so much @Liem Nguyen Duy

Omid Asadi

To calculate the STI one applies the following formula in the raster calculator:Power(“Flow Accumulation Area_Raster”/22.13,0.6) * Power(Sin(“Slope_Raster”/0.0896),1.3)