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Adapted from the Lake Ontario-St. Lawrence River Study


SCOURING- Erosion, generally in the form of downcutting in front of shore protection or other coastal structures that may be temporary or permanent.

SEDIMENT BUDGET- An accounting system for all of the sand and gravel within a defined study boundary (spatial extents).

SHARED VISION MODEL -A decision-making tool used to develop a collective representation (image or view) of the future a group aspires to create.

SHOALS (SCANNING HYDROGRAPHIC OPERATIONAL AIRBORNE LIDAR SYSTEM)- A LIDAR system that uses a green laser to profile underwater terrain and an infrared laser to detect water surfaces. The system is used to obtain bathymetric and topographic data.

SHORELINE- Intersection of a specified plane of water with the shore.

SILLS- Underwater obstructions placed to reduce a channel's flow capacity.

SOCIAL DESIRABILITY- The continued health and well-being of individuals and their organizations, businesses, and communities to be able to provide for the material, recreational, aesthetic, cultural, and other individual and collective needs that comprise a valued quality of life. The satisfaction of this objective includes a consideration of individual rights, community responsibilities and requirements, the distributional impacts of meeting these needs, and the determination of how these needs should be achieved (paid for) along with other competing requirements of society.

SOCIO-ECONOMIC SURVEY- A survey measuring the basic characteristics of a community, from which statistics can be compiled.

SPATIAL EVALUATION FRAMEWORK- The classification and delineation of terrestrial, wetland and aquatic environments in spatial units meaningful to an assessment of fluctuating levels and measures.

STAKEHOLDER- An individual, group, or institution with an interest or concern, either economic, societal or environmental, that is affected by fluctuating water levels or by measures proposed to respond to fluctuating water levels within the Lake Ontario- St. Lawrence River Basin.

STANDARDIZED HYDROLOGIC STATIONS (SHS)- Water level measurement stations operated by a governmental agency where water depth that was measured at specific geographical locations is translated into International Great Lakes Datum as updated in 1985 equivalent data.

STEADY STATE- No change over time.

STOCHASTIC SUPPLIES- Simulated sequences of water supply conditions that reflect climate variability.

STRATEGY- A general conceptual framework for guiding action based upon a particular purpose and selected means for achieving agreed upon ends.

SUBMERGED MACROPHYTES- Plant species that grow under water during their entire life cycle (not including algae).

SUBSTRATE COMPOSITION -Categorical assignments of the lake/river bottom from silt to bedrock size classes.

SURFACE WATER- Water open to the atmosphere including lakes, ponds, rivers, springs, wetlands, rtificial channels and other collectors directly influenced by surface water.

SYSTEM DYNAMICS- A simulation modeling methodology developed at Massachusetts Institute of Technology for the study of the behavior of complex systems. System dynamics is based upon the identification of key system variables, the interactions between them and the study of the effects of these interactions over time.

SYSTEMS APPROACH -A method of inquiry which complements the classical analytical method of science by emphasizing the concept of "whole systems" and the irreducible properties of whole systems that result from the interactions among individual components.

  • Background

Learn more about the history of regulating water levels and flows on Lake Ontario

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