"(It has been assumed that) the part of the Sutlej that flowed into the Sarasvati shifted to the Beas, eventually swelling the Indus’s waters: “An increase in water and sediment discharge of that magnitude [provoked by the westward shift of the Sutlej] would have had dramatic effects downstream in the Lower Indus Basin,” according to Louis Flam. This might help explain the near complete absence of Late Harappan sites in this region: they may have been either washed away or buried under sediments."