Anders Rapp, Valter Axelsson, Len Berry, D. Hammond Murray-Rust, Soil Erosion and Sediment Transport in the Morogoro River Catchment, Tanzania, Geografiska Annaler. Series A, Physical Geography, Vol. 54, No. 3/4, Studies of Soil Erosion and Sedimentation in Tanzania (1972), pp. 125-155
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Rapp et al. (1972) studied this question.