If you've visited the Thames you might have noticed these giant floating cages. They are called passive driftwood collectors (PDC) and they are ingenious in their simplicity. Much of the floating debris in the river is invisible because it is floating a foot or so below the surface of the water. The PDCs are moored at carefully chosen points on the river where the current and tidal stream carries the most driftwood and debris. They swing on their moorings to face into the tide and the hinged gate at the front is pushed open by the force of the water. Once the PDcs are full the Port of London Authority empties the contents and they are left to fill up all over again.
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