to raise the grade or level of (a river valley, a stream bed, etc.) by depositing detritus, sediment, or the like.

What is a degraded river?

Degradation is the lowering of a riverbed over a period of time.

What is an Aggrading and degrading river?

Aggradation refers to an increase in elevation of land usually in river system due to deposition of sediments. Degradation occurs due to erosional activities of mainly wind and water. It refers to the lowering of a landform through erosional process.