Patent ID: 8621740

Claim:
A system for forming a temporary water-retaining structure, comprising a plurality of water-retaining elements, the water-retaining elements comprising a bottom, a plurality of side walls, and connecting means, which water-retaining elements can be connected to each other by means of the connecting means, which plurality of side walls are immovably connected to the bottom and extend upwards from the bottom to form a water-fillable container, and which connecting means are designed to connect the water-retaining elements in a water-retaining manner to at least one adjacent water-retaining element, wherein the water-fillable container is open at the top so as to receive a second water-retaining element during transport and/or storage, which system further comprises at least one connecting piece, comprising a bottom and a plurality of side walls, which plurality of side walls extend upwards from the bottom to form a water-fillable container, which connecting piece differs in shape and/or size from the water-retaining element and is provided with connecting means which are complementary to the connecting means of the water-retaining element, and wherein at least one of the side walls of at least one of the at least two water-retaining elements forms an angle of more than 90 degrees relative to the bottom of the corresponding water-retaining element and at least one side wall of the connecting piece forms a complementary angle of less than 90 degrees relative to the bottom of the connecting piece.