Definition of Terms

 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.
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TermDefinition
Pebble count:
Method of measuring the composition of streambed material by manual collection while wading in a stream.
Periphyton:
Microflora and fauna attached to the bottom or other submerged objects.
Permeability:
Measure of the rate at which water can penetrate and pass through a medium such as soil.
Perennial stream:
A stream that flows continuously throughout the year.
Physiographic province:
A region of which all parts are similar in geological structure and climate, while differing from adjacent regions.
Pollution:
Presence of matter or energy, usually of human origin, whose nature, location, or quantity produces an undesired environmental effect.
Pool:
Small depression with standing water or an areas of slow water in a stream.
Potamodromous:
Life cycle strategy of a fish that includes migrations, spawning, and feeding entirely in freshwater. Compare with anadromous, catadromous, and diadromous.