The Karen Self Closing Flood Barrier is a carefully designed self-rising floodgate that has been in use globally since 2000 . Its design uses the approaching floodwaters to raise the barrier automatically. The passive operation, along with a minimal footprint and no need for steps or ramps makes this type of defence ideal for unmanned sites, for where aesthetic considerations mean that a permanent barrier is not acceptable, or where there would be insufficient warning and manpower to use manually installed barriers. Single Flood barriers are available up to 10m in length and 2.5m in height. Multiple units can be linked together to create long runs where required, using permanent intermediate posts.
The Karen self closing flood barrier, which consists of a rigid foam core and aluminium outer layer, usually resides below ground in a vertical position within a steel or concrete trough. When floodwater rises to a pre-determined level, the water spills into a service pit and then through a pipe into the trough, causing the barrier to float and raise fully. When the trough is filled, an angled support block locks the barrier into place, sealing it and making it watertight. The barrier is now fully effective and watertight to its full height.
As the floodwater recedes, the barrier lowers to its resting position. The trough can also be ‘pumped out’ to lower the barrier before the adjacent groundwater levels recede fully.
The Karen Manufacturer Self Closing Flood Barrier configuration is in straight lengths from 1m, with the overall flood wall designed in suitable sections of up to 10m each as standard. Sections can also be linked together using angled guide-posts for changes in direction.
