"Alluvial" refers to the deposits left behind by flowing water, such as rivers or streams. It usually describes fertile soil or sediments that accumulate along riverbanks or in floodplains. Full definition
«LA is not a desert,» insisted author D.J. Waldie, referring to the water table in layers of alluvial fan underneath the metropolis, but you'd never know it. (treehugger.com)
Continue by coach past vineyards built on rich alluvial plains, which produce world class wines, to Nelson. (acrossnz.com)
By the end of the year it had attracted around 1 500 gold prospectors with their sluice boxes, in search of alluvial gold along the banks of the creek. (eagerjourneys.com)