Flood Control International has just completed design and fabrication of some new sliding flood gates for a project in New Zealand.
The gates are to protect a town by closing off a roadway 21 metres wide and 2.7metres high (69ft x 9ft).
The twin flood gates will replace an existing demountable flood barrier which, due to its size, requires a large amount of manpower and time to install in advance of a flood.
As the road is a busy highway, the time closed off needed to be minimised. Also, there could be no step or trough to guide/ support the gate due to it being across a highway, and the possibility of any trough filling with debris/ ice/ water.
The two leaves of the flood gate are winched horizontally into position and then lowered on their wheels to form a fully watertight barrier.
Swing-out braces on the back of the flood gate locate into the groundbeam and are supported on the existing concrete foundations from the demountable flood barriers, thereby saving the need for extensive excavation and concreting works to support such a massive gate with high flood loads.