And they'll probably be given the job of building the flood defences in 15 years' time too.
It can also reduce the capacity of channels in flood defences to carry water.
In addition to the barrier, the flood defences for 11 miles down river were raised and strengthened.
The government spends an estimated £500 million per year on coastal flood defences.
The report included a detailed review of London's flood defences.
The walls have been re-strengthened, as part of the area's flood defences.
Over the years this part of the river has been heavily modified but without any significant flood defence.
Since then, millions have been spent on strengthening flood defences.
The waters have already demolished the flood defences in many areas.
As a result, the council is reviewing its flood defences and drainage systems.