Visitors to Worthing's Brooklands Park may have noticed that the water levels are higher than usual for this time of year.
This is because of a mechanical issue with the outfall at the southern end of the lake in Brighton Road.
A failure with the flap, which is designed to prevent seawater from entering the lake at high tide, means that the sea is flowing in and increasing water levels.
Engineers visited the site as soon as a report was received and contractors are due to attend site later today to inspect the area, when the tide levels allow.
We want to assure residents that the potential impact on birds, fish and other wildlife by incidents like this are low. Our teams will continue to monitor the situation.