Regional water situation

Southern and Southwest Finland 8.10.

Since the end of September, the small rivers in Southern and Southwest Finland have fallen mainly to the seasonal normal level. The heavy rainfall of the storm forecast for Wednesday will again raise the water levels of rivers clearly, in places even to the highest levels in the autumn. Low-lying fields might flood around River Perniönjoki. The amount of precipitation may reach 30 mm per day, which may cause small urban floods. With the autumn rains continuing, the water levels will probably remain high throughout October.

Water levels in lakes will also rise as a result of the forecast rainfall. In the past month, the water level of Lake Pyhäjärvi in Säkylä has declined slightly despite the renovation of the Kauttua dam. The flow regulation will be restricted to 2.5 m3/s until mid-October, and the water level may rise somewhat due to the forecast rainfall.