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Water quality
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The Monitoring program identifies possible adverse situations and watershed dangerous areas where improved water quality and the protection of its multiple uses are required for water security.

In order to meet these goals, Itaipu keeps a historical data series since before filling the reservoir, as well as a monitoring network placing a total of 13 sampling stations in the reservoir's center and arms. Such stations are extremely important for assessing ecosystem trends.

Seventeen stations placed in the main affluents of the Paraná Watershed 3 (the part of the Paraná watershed that flows into the reservoir) are monitored. More than 30 water quality parameters including physicochemical – such as pH, dissolved oxygen, nutrients and heavy metals – and biological indicators – such as phytoplankton, zooplankton, benthic macroinvertebrates and coliforms – are measured in all stations.

So far, the reservoir has shown oligotrophic features (few nutrients and algae free) in its center whereas the trophic degree in its arms and main affluents may vary according to the surrounding areas usage and seasonal conditions.

Besides benefiting the community as a whole, the Monitoring program is very useful for the Watershed Committees as they help to define the Watershed and Sanitation Plans by supporting decision-making processes regarding the water quality standards that are consistent with its multiple uses.

Another program's work channel is the Aquaculture Parks monitoring of fish farming in net cages. This initiative consists of 12 monitoring stations and aims to guarantee quality water for that activity and other water usages by measuring the support capacity of net cages.

Water suitability

There are eight artificial beaches along the Itaipu reservoir where people can bathe, favoring tourism in the area. Beaches water suitability is weekly monitored during summer season (from November to March) in partnership with the Environmental Institute of Paraná (IAP) and follow-up reports are made available for everyone's knowledge.

Read more on aquatic plants monitoring.

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