Dear Sir. Concerning your issue about the determinatin of erodibility factor k in SLEMSA model experimentally. Soil loss research work was carried out on three experimental plots. These experimental plots were treated in three different ways. Collection tanks were used to measure the amounts of runoff and eroded soil sediments from each plot. Sediment samples were analyzed at Chitedze Research Station. Rainfall data was collected using automatic and improvised rain gauges. Slope steepness values were also recorded. Soil losses caused by individual storms, monthly rainfall and seasonal (December to March) were computed using both RUSLE and SLEMSA models. A Sensitivity analysis was also carried out on all the parameters of SLEMSA model. The results showed that using individual storms and monthly rainfall, RUSLE over estimated while SLEMSA under estimated the values of soil loss. Based on these findings, both models RUSLE and SLEMSA have proved to be suitable for estimating soil loss using seasonal rainfall i.e. estimate long term soil loss rather than individual storm and monthly rainfall. I think the following below links may help you in your analysis:

http://iuss.org/19th%20WCSS/Symposium/pdf/0166.pdf

 http://lib.ugent.be/fulltxt/RUG01/002/305/181/RUG01-002305181_2016_0001_AC.pdf

https://cals.arizona.edu/oals/malawi/Papers/Mughogho98.html

Thanks