Alluvial

n.	1.	Alluvial soil; specif., in Australia, gold-bearing alluvial soil.
a.	1.	Pertaining to, contained in, or composed of, alluvium; relating to the deposits made by flowing water; washed away from one place and deposited in another; as, alluvial soil, mud, accumulations, deposits.

Adj.

1.

alluvial - of or relating to alluvium

alluvial deposit, alluvial sediment, alluvion, alluvium