Once a year, the Environment Agency holds a full tide test closure of the Thames barrier. The Barrier gates rotate by 90 degrees into the fully closed defence position stopping the tide going upstream into London.
This year's closure is taking place on Sunday 23rd September 2018.
As the tide continues to come in, a higher level of water will build up downstream of the Barrier creating a different water level either side of the gates. Shortly after high tide, the gates will rotate further creating a 2 metre gap underneath (underspill).
This in turn creates a spectacular white water effect across the river, as the flow of the Thames is forced beneath the massive steel gates. The underspill process can last up to 2 hours and is a unique sight.
There will be various fun and educational activities for children, talks, demonstrations, information and display stands. There will also be a variety of food/ beverage vendors on site serving food and drinks.
This event is free.
