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But, we must understand that the SDR<br>is a gross generalization based on few and very difficult<br>to obtain data (Roehl, 1962; Walling, 1983); like most<br>models, it can hide huge disparities. We have already<br>discussed the efficiency of water moving in channels compared<br>to that moving across slopes as shallow flow; so it<br>is with sediment delivery from slopes to streams. If soil<br>erosion is so advanced on an upland surface that rills and<br>gullies are present, then water and sediment can be efficiently<br>conveyed off the slopes; indeed, additional sediment<br>may well come from the rills and gullies themselves.
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