Answer: silting

AnswerCrossword Clue
SILTINGChoking up, as a river delta
SILTINGRiver phenomenon.
SILTINGFilling with sediment
SILTINGChoking, as a river
siltingSILT, to fill with a fine sediment
siltingBecome filled or blocked with silt
siltingFill or block with silt