Definition of Terms

There is a lot of technical terms on the Rivers and Streams website. This page is designed to help navigate and define these words and phrases. Use the line below to skip to a certain letter.
Specific type of place within an ecosystem occupied by an organism, population or community that contains both living and nonliving components with specific abiotic and biotic characteristics.
Total concentration of calcium and magnesium ions expressed as mg/L.
Head cut:
Upstream migration or deepening of a stream channel that results from cutting of the streambank by high water velocities.
Headwater stream:
Upper reaches of tributaries in a drainage basin.
A graph showing stage, flow, velocity or other characteristics of water with respect to time at a given point on a stream.