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I am just rambling on. Therefore, forgive me if I am way off: I found one study that points out toward "excessive sediment loading" done by: Authors: Gichana, Zipporah, Njiru, Murithi, Raburu, Phillip Okoth, and Masese, Frank Onderi; all from Department of Fisheries and Aquatic Sciences, University of Eldoret, Eldoret Kenya. Their article title is "Effects of human activities on benthic macroinvertebrate community composition and water quality in the upper catchment of the Mara River Basin, Kenya" published in Lakes & Reservoirs: Research & Management. Jun2015, Vol. 20 Issue 2, p128-137 (10p). This is a very thorough detailed study and points out the interacting mechanisms. Can simple sediment traps, e.g., rock check-dams, strawbales, etc. be of help along with periodic stream restoration. Even pacing out the bathing/washing period and spaces among the population, so, a significant load does not enter the stream all at once. There was also a study in the U.S. that by placing multiple in-sequence properly graded check-dams can reduce the sediments significantly.