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Indicator Type: Environmental Condition
This indicator shows the status of lake levels for 27 selected Alberta lakes. The water level throughout the year is compared to historical patterns in recorded data. It is then ranked based on five possible categories, ranging from the highest classification of "much above normal" to the lowest, "much below normal". A mid-range classification is considered "normal".
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Trend: Levels generally moderated from 2005 and most of the lakes are in the normal to below-normal range.
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What does the indicator show?
Lake levels fluctuate on a natural basis in response to variation in weather and climate patterns. They also respond differently depending on their physiographic region and how large their watershed is compared to the size of the lake. Therefore, it is not necessarily expected that all lakes that are close to each other will respond in the same way, or have the same classification. However, the indicator does show the status of individual lakes from year to year. This provides valuable information to the public and to managers when considering water issues related to lakes.
The historical lake level index rankings are presented in the table below:
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Why is this indicator important?
Lakes are highly valued by Albertans and provide numerous environmental, recreational, social and economic benefits. Alberta Environment often receives questions from the public about how much lake levels change over time and how they respond to conditions such as drought. This information can assist in interpreting related observations of changes in water quality, fisheries, or recreational opportunities as lake levels change over time. It can also affect management decisions related to the potential for flooding or water use needs.
The lakes have been chosen based on availability of long-term data and are mostly responding to natural or near-natural fluctuations. They are generally not used as reservoirs or are subject to major diversions* or withdrawals. This indicator is intended to reflect the environment's response to natural fluctuation in climate. The separate Reservoir Level Index addresses reservoirs and lakes that are managed for storage and water supply.
*Wabamun Lake is an exception. It receives inflows to offset diversions that occur within its watershed. However, the objective is to reduce the impact of the diversions and return the lake to its natural water level (including fluctuations).
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What actions are being taken?
This indicator is intended to portray natural conditions and contribute to the general knowledge of water in Alberta. It does not necessarily require that specific actions be taken on a regular basis. However, the indicator can increase understanding of other water issues such as water quality, fisheries, and recreation. This information can help guide other lake or watershed management decisions.
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Links to additional information
Lake and Reservoir levels – Alberta Environment: http://www3.gov.ab.ca/env/water/basins/BasinForm.cfm
Alberta Lake Management Society: http://alms.biology.ualberta.ca/
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Feedback
E-mail the SOE Coordinator: SOE.Coordinator@gov.ab.ca or complete this short on-line questionnaire to provide your feedback: http://www.zoomerang.com/
survey.zgi?p=WEB224DW6P3E2K.
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