Assertion: river | /r/CapableOf | flow at higher elevation
Facets:
value: to create a new floodplain
type: PURPOSE
value: before downcut
type: TEMPORAL
Source sentences:
text: Fluvial terraces are the remnants of earlier floodplains that existed at a time when either a stream or river was flowing at a higher elevation before its channel downcut to create a new floodplain at a lower elevation.