Assertion: river's level | /r/HasProperty | lowered by about 10 m.
Facets:
value: over the next few centuries
type: TEMPORAL
Source sentences:
text: Sometime in the past several centuries, the Similkameen River eroded down through these deposits (forming the steep bank on the other side of the river), and the base level of the small creek was lowered by about 10 m. Over the next few centuries, this creek will seek to become graded again by eroding down through its own alluvial fan.