Skip to Main Content
Our MD Streams
Rivers & Streams
Rivers and Streams Home
Maryland Biological Stream Survey
Stream Waders Volunteers
Maryland Water Monitoring Council
Maryland Stream Health
Marcellus Shale Stream Monitoring
MBSS Trainings and Certifications
Maryland Invasive Species
Species Spotlight Archives
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.
Material through which water cannot pass or passes with great difficulty.
Natural or artificial body of water that is confined by a structure such as a dam to retain water.
Index of biotic integrity (IBI):
A measure of the degree to which aquatic resource quality deviates from what would be expected at an undisturbed location. Calculated based on data from biological communities that measure species composition, trophic position, species abundance, and condition.
Organisms that respond predictably to various environmental changes and whose presence, absence, and abundance are used as indicators of environmental conditions.
A stream that does not have a continuous flow of water throughout the year.
Register to Vote
580 Taylor Ave, Annapolis MD 21401