Its task is to protect built-up areas from floods similar to those that occurred in the disastrous deluge of 2002. The developers include a 30 centimetres reserve in all their worst case scenarios.

The barrier is made of a solid concrete wall in combination with aluminium temporary walls, leading through the street K Přehradám, alongside the Prague – Slapy main road. It starts in Kamenolom Zbraslav, where it is deeply embedded into rocks, and leads all the way up to Prague’s bridge Závodu míru, where it rests on a slope.

With its 1.35 kilometres in length, the construction is one of the longest in Prague. Its construction is well sealed against water leakage by being dug in up to 8.5 metre deep. The project is now almost finished, except for some small finishing touches, such as panelling on some parts of the walls. Around 10th September it is expected to be ceremonially opened. City Prague paid almost one quarter of a billion crown for the project.