Regional water situation

Kanta-Häme, Pirkanmaa and Pori region 7.7.

In the Kokemäenjoki river basin, heavy rainfall in recent days has increased the water levels in rivers. In the main stem of River Kokemäenjoki, the discharge is still lower than the seasonal average, but the discharge is forecast to rise close to the typical seasonal values at the end of July.

The water levels of large regulated lakes in the Kokemäenjoki river basin are close to the average seasonal levels. The water levels of natural lakes, on the other hand, have remained significantly lower than usual in the summer as a result of the low amount of snow in the winter and the early spring that was low in precipitation. The water levels of lakes are in places near the lowest seasonal levels in their measurement history. For example, the water level of Lake Tarjanne is currently close to the lowest water level in its observation history that began in 1865. In Valkeakoski, restrictions on flow regulation were introduced at the end of March, to prevent excessive decline of the water level of Lake Mallasvesi. Despite this, the water levels of Lakes Mallasvesi and Längelmävesi are currently approximately 25 cm below the seasonal average.

Recent rainfall has raised the water levels of natural lakes and rivers slightly above the average seasonal level in the Karvianjoki river basin. According to forecasts, water levels will rise slightly but will start declining at the end of the week.