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Glossary

Adapted from the Lake Ontario-St. Lawrence River Study

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PEAKING -The variation of hourly water flows above and below the daily average flow (for instance, midday flow higher than evening and night flows), primarily due to hydroelectric generating operations during which water is stocked during periods of off-peak demand in order to increase hydroelectric power generation at peak periods.

PERFORMANCE INDICATOR- A measure of economic, social or environmental health. In the context of the Study, performance indicators relate to impacts of different water levels in Lake Ontario and the St. Lawrence River.

PHOTOSYNTHESIS- The process through which the cells of green plants and certain micro-organisms convert energy from sunlight into stored, usable chemical energy.

PHYSICAL IMPACT SURVEY- A characterization study of the impact of water level fluctuation on infrastructure use or constraints.

PHYSIOGRAPHY- A descriptive study of the earth and its natural phenomena, such as climate, surface etc.

PLAN 1958-D- A plan used by the International St. Lawrence River Board of Control since April 1963 that specifies outflows from Lake Ontario in order to satisfy the existing set of criteria established by the IJC and related to interests on Lake Ontario and the St. Lawrence River.

PLAN FORMULATION AND EVALUATION GROUP- A group established as part of the Study to develop alternative water level regulation plans, establish performance indicators for such plans, and to measure the effectiveness of such alternate criteria and operating plans.

PLAN FORMULATION METHOD- A method involving a multi-objective, multi-stakeholder evaluation procedure used to evaluate factors not previously considered in determining whether a revised operating plan performs better than an existing plan.

PLANIMETRIC CAPABILITIES- The capability of a system to measure areas.

POLICY- The position adopted by a government on an issue which is expected to structure and guide the decision-making process.

PONDING- The variation of daily water flows above and below the weekly average flow (for instance, average weekday flow higher than average weekend flow), primarily due to hydroelectric generating operations.

POSITION OF INTERESTS- The perceptions, beliefs and preferences of interests regarding fluctuating water levels, implications of those levels, and acceptability of a measure or policy to an interest. Positions may be directly stated or may be inferred from supporting or opposing activities taken by the interest in the decision-making process.

PRIORITY CONSERVATION SPECIES -A species protected by federal, state, or provincial laws.

PUBLIC COMMUNICATIONS- Activities where the purpose, design, and plan intends for two-way communication for a defined period of time between Study personnel and the public or various publics.

PUBLIC INFORMATION -Activities where the purpose, design, and plan intends to deliver information to the public or various publics. Examples: press releases and articles in the Study Newsletter, Ripple Effects.

PUBLIC INTEREST ADVISORY GROUP (PIAG)- The group of volunteers from the United States and Canada working to ensure effective communication between the public and the International Lake Ontario-St. Lawrence River Study Team.

PUBLIC INVOLVEMENT- Activities where the purpose, design, and plan is such that members of the public or various publics are engaged in the Study on a continuing basis with other "expert" resources.

PUBLIC PARTICIPATION -Activities where purpose, design, and plan intends that members of the public have an opportunity to participate for a defined period of time in a Study activity.

  • Background

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

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