substrate- the material making up the bed or bottom of a stream or other body
organic or inorganic particles that are suspended in and
carried by water. The term includes sand, mud, and clay particles as well as
solids in wastewater.
The name applied to a group (e.g., organisms, soils)
in a formal system of classification or taxonomy.
in a thermally stratified lake, the middle iayer, characterized by
a rapidly declining a 1 degree C decrease for each vertical meter of the water
a sample area, usually in the form of a long continuous line.
the degree of eutrophication of a lake. Transparency, chloro
phyll a, phosphorus concentration, amount of macrophytes, and quantity of
dissolved oxygen in the hypolimnion can be used to assess trophic state.
a type of beneficial use analysis that is a multi-faceted
assessment of the physical, chemical, biological, and economic factors that
affect the attainment of the use of the water resource.
term used to describe a quantity that has no fixed value. Variables
include, but are not limited to, distance, mass, chemical concentration, or
watershed -the geographic region contributing to a water body. The area
contained within a divide above a specified point on a stream. It may also
be termed drainage area or drainage basin.
microscopic animals which float freely in lake water, graze on
detritus particles, bacteria, and algae, and may be consumed by fish.