FINAL REPORT - International Joint Commission

COASTAL EROSION – The wearing away of a shoreline as a result of the action of water current,
wind and waves.
COASTAL PROCESSES TECHNICAL WORK GROUP – A scientific and technical work group for the
International Lake Ontario-St. Lawrence River Study that is investigating the impacts of water level
fluctuations on shore property, with particular attention to erosion and flood processes.
COLONIAL BIRDS – Birds that nest in groups.
COMMERCIAL NAVIGATION TECHNICAL WORK GROUP – A scientific and technical work group for
the Study that is investigating the impacts of water levels on cargo shipping, including tug and
barge operations.
COMPUTER MODELLING – The use of computers to develop mathematical models of complex systems
or processes.
CONNECTING CHANNELS – A natural or artificial waterway of perceptible extent, which either periodically
or continuously contains moving water, or which forms a connecting link between two bodies of water.
The Detroit River, Lake St. Clair and the St. Clair River comprise the connecting channel between
Lake Huron and Lake Erie. Between Lake Superior and Lake Huron, the connecting channel is the
St. Marys River.
CONSERVATION – The planned management of a natural resource, with the goal of protecting and carefully
preserving it from exploitation, destruction or neglect.
CONSUMPTIVE USE – The quantity of water withdrawn or withheld from the Great Lakes and assumed to
be lost or otherwise not returned to them, due to evaporation during use, leakage, incorporation into
manufactured products or otherwise consumed in various processes.
CONTROL WORKS – Hydraulic structures (channel improvements, locks powerhouses, or dams) built to
control outflows and levels of a lake or lake system.
COSMOS MODEL – Name of the erosion prediction numerical model used in this Study for the Lake and
upper river.
CRITERIA – A principle or standard by which a judgement or decision is made. Criteria are conceptual
but must have operational (measurable in principle) components. Any single criterion can be used
to compare the merit of measures or policies along the dimensions encompassed by the criterion.
Criteria are used to assess measures and criteria are used to assess the decision-making process
(for example, group access to the decision-making bodies).
CRITERIA, CORE – The broad principles upon which the overall value of any measure can be assessed
relative to other measures. They include economic sustainability, environmental integrity, social
desirability, uncertainty and risk, political acceptability and implementability, and equitability.
CRITERIA, OPERATIONAL – These criteria are subsets of the core criteria. These sub-criteria are
quantified on the basis of the application of specific group rules to data or estimates of impacts of the
measure. Impact assessments used to score sub-criteria are ultimately used to compare the profiles
of measures.
CURRENT – The flowing of water in the lakes caused by the earth’s rotation, inflows and outflows,
and wind.
DESIGN RANGE – The range of factors (including expected water levels) taken into consideration when
making an investment decision.
GLOSSARY OF TERMS
Options for Managing Lake Ontario and St. Lawrence River Water Levels and Flows
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