rill

noun 0.831

rille

noun 0.697

erosion

noun 0.671

sheet erosion

noun 0.637

rivulet

noun 0.628

accelerated erosion

noun 0.593

riffling

noun 0.579

erodibility

noun 0.570

runnel

noun 0.559

rippling

noun 0.551

ridging

noun 0.533

corroding

noun 0.529

rift valley

noun 0.528

gully

noun 0.522

ripple carry

noun 0.522

surface runoff

noun 0.521

rip current

noun 0.521

riffle

noun 0.520

rifling

noun 0.518

eluviation

noun 0.516

rift

noun 0.516

riving

noun 0.515

ruching

noun 0.508

bioerosion

noun 0.507

roiling

noun 0.506

ripple

noun 0.505

furrow

noun 0.504

microrelief

noun 0.503