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Glossary

Adapted from the Lake Ontario-St. Lawrence River Study

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HABITAT- The particular environment or place where a plant or an animal naturally lives and grows.

HABITAT HETEROGENEITY- Habitat encompasses the diverse characteristics of the environment that define an area where specific biota live and is necessary for life functions.

HABITAT SUITABILITY INDEX (HSI)- A relative weighting (usually between 0 and 1) of the suitability of a particular environmental characteristic or combination of characteristics based on a particular biota's requirements.

HAZARD LAND- An area of land that is susceptible to flooding, erosion, or wave impact.

HYDRAULICS- The study of the mechanical properties of liquids, including energy transmission and effects of the flow of water.

HYDRAULIC MODELING- The use of mathematical or physical techniques to simulate water systems and make projections relating to water levels, flows and velocities.

HYDROELECTRIC POWER- Electrical energy produced by the action of moving water.

HYDROELECTRIC POWER GENERATION TECHNICAL WORK GROUP- A group of technical experts for the Study that are evaluating how different regulation plans affect power generation.

HYDROLOGIC ATTRIBUTES - Statistics on water levels and stream flows.

HYDROLOGIC CYCLE- The natural circulation of water, from the evaporation of seawater into the atmosphere, the transfer of water to the air from plants (transpiration), precipitation in the form of rain or snow, and runoff and storage in rivers, lakes and oceans.

HYDROLOGIC MODELING -The use of physical or mathematical techniques to simulate the hydrologic cycle and its effects on a watershed.

HYDROLOGY- The study of the properties of water, its distribution and circulation on and below the earth's surface and in the atmosphere.

HYDROLOGY AND HYDRAULICS MODELING TECHNICAL WORK GROUP- A scientific and technical work group for the Study that is developing models to predict water levels and flows in the Lake Ontario-St. Lawrence River system, based on various regulation plans and climate scenarios.

HYDROPERIOD -The length of time (and seasonality) that water is present over the surface of the wetland.

  • Background

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

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