Assessing and Determining the best rainfall erosivity indices in Kermanshah Province

The effective energy for erosion is called rainfall erosivity, which is rainfall erosion potential and depends on ýrainfall physical characteristics. Different indices have been developed to quantify the rainfall erosivity. In this ýresearch, study fields were conducted in Kermanshah provinces. The study site was Kaboudeh soil conservation ýresearch station and two types of land uses were selected for the study including 24 established runoff and sediment ýplots. The sites were equipped with digital rain gauges, thus necessary rainfall data were collected and used. Based ýon literature review, 11 rainfall erosivity indices were identified to fit more for erosivity so their efficiency were ýchecked on the study. Best erosivity indices were selected by determination of correlation coefficient between the ýamount of erosion in each single storm and calculated rainfall erosivity indices. The results indicated that the best ýindex for the study sites was EI60 and AI30 that has maximum correlation coefficient with soil loss.