What does the word alluvial mean?

Usage examples for alluvial

  1. The country around is low, with a rich alluvial soil. – A Letter from Major Robert Carmichael-Smyth to His Friend, the Author of 'The Clockmaker' by Robert Carmichael-Smyth
  2. Here I saw luxuriant red clover and blue grass, and he had also a field of carrots, which do well on this alluvial bottom, it seems. – Northern California, Oregon, and the Sandwich Islands by Charles Nordhoff
  3. Their present flood plains lie as much as some hundreds of feet below wide alluvial terraces which mark their former levels. – The Elements of Geology by William Harmon Norton