Regional water situation

Central Finland, Päijät-Häme and Kymenlaakso 11.9.

In the Kymijoki river basin, with the exception of its northern part, water levels of lakes are below their average early-September levels. The last month’s rainfall in the entire water body has been average, and the amount of rainfall forecast for the next two weeks is also typical. No major changes to water levels are expected yet.

The water level of Lake Päijänne is around 25 cm below the average level of the season. The flow regulation will be reduced to 130 m3/s after the maintenance has been completed. In the lower reaches of River Kymijoki in Kuusankoski, the discharge is 140–150 m3/s. The water level of Lake Päijänne will probably remain fairly close to its current level until the end of September.

The water level of Lake Puula is slightly lower than its usual level at this time of the year, and flow regulation at Kissakoski will likely remain at 9 m3/s in September. The water level of Lake Kyyvesi is around 25 cm and that of Lake Synsiä almost 15 cm lower than average. The small flow regulation at Kissakoski will be visible as low water levels in the water system downstream from Lake Puula.

Of the lakes in the northern part of the river basin, the limitation of the outflow of Lake Keitele has been continued to prevent the water level from falling below the minimum water level required in navigation channels used until mid-October. The water level of Lake Ylä-Keitele has remained close to the same level since early August and is over 20 cm below the average seasonal level. According to the forecast, the water level of Lake Keitele is starting to rise slightly.

On the Rautalampi route, the water levels of Lakes Konnevesi and Pielavesi-Nilakka are still approximately 20 cm lower than the seasonal average. The water level of Lake Konnevesi is forecast to remain close to its current level for the next month, and the water level of Pielavesi-Nilakka is gradually starting to rise.