6 words in this vocabulary list
noun a system of pipes or channels that carry away excess water or liquid waste
adjective related to the process of draining or removal of liquid
noun a large natural stream of water flowing in a channel to the sea, a lake, or another such stream
noun A vertical column of water extending from the surface to the bottom of a body of water, such as a lake or ocean.
noun a line connecting the lowest points along the length of a riverbed or valley
adjective relating to or characteristic of a river
noun a substance that has not been treated, filtered, or processed in any way