explanatory variables-statistical term for a variable that helps to explain the
variability in the dependent variable. For instance, temperature may be an
explanatory variable for dissolved oxygen because it may be used to explain
part of the variability in dissolved oxygen.
use of the water resource is designated by the state water
quality agency. Uses include, but are not limited to, water supply, navigation,
recreation, and aesthetics.
nonliving dissolved and particulate organic material from the
metabolic activity and death of terrestrial and aquatic organisms.
volume of water per unit time moving past a fixed point.
areas of relative homogeneity in ecological systems or in relation
ships between organisms and their environments.
embeddedness (cobble embeddedness) -the amount of fine sediment that is
deposited in the spaces between larger stream bottom particles.
uppermost, warmest, well-mixed layer of a lake during summer
time thermal stratification. The epilimnion extends from the surface to the
mass of pollutant lost from unit area per unit time (e.g.,
nutrient-rich or fertile body of water.
feedback loop -a process of
source management based on implemen
of best management practices
are identified through a
planning process and applied by land managers for site-specific conditions.
The effectiveness of a system of
is evaluated through water quality
monitoring. The results may be used to refine the problem statement or
change monitoring or management plans.
flux- the rate at which a measurable amount of material flows past a designated
point in a given amount of time.
the study of the landforms of the earth and the processes that
a specific type of place occupied by an organism, a population, or a
lower, cooler layer of a lake during summer thermal stratifica
impervious-a surface that cannot be easily penetrated. For instance, rain does
not readily penetrate asphalt or concrete pavement and roofing and runs off
rather than infiltrating.
littoral zone-the upper portion of the water column of a lake or stream that
light intensity to support the growth of plants.
load-mass inputs per time (e.g., kg/year).
invertebrate aquatic animals large enough to be seen
without a microscope. In streams and lakes these are usually immature forms
of insects but also include worms, snails, clams, crustaceans, etc.
rooted and floating aquatic plants, commonly referred to as
waterweeds. These plants may flower and bear seed. Some forms. such as
and coontail, are free-floating without roots.