Discussion on “Representative sediment sizes in predicting the bed-material load for nonuniform sediments” by Wan Hanna Melini Wan Mohtar, Junaidi, Suraya Sharil, Muhammad Mukhlisin [Int. J. Sed. Res. 31 (2016) 79-86]

In this discussion, we want to highlight the important findings of the last two decades by Hunziker and Jäggi (2002) and Wong and Parker (2006), among others, who reanalyzed and revised the original data forming the basis of the MPM sediment transport equation. Furthermore, by using an actual adaptation of the original MPM formula, the prediction of the sediment transport rate for the data given in the paper under discussion seems to be acceptable.