Of or relating to alluvium.

Roget 213: horizontal, level, even, plane; flat etc. 251; flat as a billiard table, flat as a bowling green; alluvial; calm, calm as a mill pond; smooth, smooth as glass.    recumbent, decumbent, procumbent, accumbent^†; lying etc. v.; prone, supine, couchant, jacent^†, prostrate, recubant^†.    ... show more

Roget 342: earthy, continental, midland, coastal, littoral, riparian; alluvial; terrene etc. (world) 318; landed, predial^†, territorial; geophilous^†; ripicolous.    ... show more

Roget 344: champaign^†, alluvial; campestral^†, campestrial^†, campestrian^†, campestrine^†.