1934 24 579 (caption) Smale-scale soil mottlings on upland near eastern margin of prairie, showing influence of rill action around margins.
1962 L. C. King v. 137 Following the cutting of a steep hillside by rill and gully action.., surface water requires to be discharged across a relatively flat terrain to an adjacent stream channel.
1992 J. Gerrard v. 75 The fine debris washed down by rains is moved forward by rill action.