The device comprises an effluent supply pipe (15), effluent dispersion pipes (17), and a distribution unit (19) provided with an input connected to the supply pipe and first and second outlets (29, 31). The distribution unit is likely to adopt a first configuration in which the first outlet is active and the second outlet is inactive when a flow of effluent received from the supply pipe is lower than a determined limit, and a second configuration in which the first and second outlets are both active when the flow of effluent received from the supply pipe is higher in given extreme cases. The device comprises an effluent supply pipe (15), effluent dispersion pipes (17) having openings (25) for dispersion of an effluent, and a distribution unit (19) provided with an input connected to the supply pipe and first and second outlets (29, 31). The distribution unit is arranged such that each outlet is ready to successively supply the effluent to each dispersion pipe. The distribution unit is likely to adopt a first configuration in which the first outlet is active and the second outlet is inactive when a flow of effluent received from the supply pipe is lower than a determined limit, and a second configuration in which the first and second outlets are both active when the flow of effluent received from the supply pipe is higher in given extreme cases. The distribution unit includes a chamber. The first output emerges in the chamber on a first level, and the second output emerges in the chamber on a second level that is higher than the first level. The distribution unit is arranged such that the second level is adjustable. The chamber is delimited by a first tubular section and a second tubular section. The first and second tubular sections are connected one to the other in a dismountable manner. The first outlet emerges in the chamber by an opening placed in the first tubular section, and the second outlet emerges in the chamber by an opening placed in the second tubular section. The second tubular section slides according to a vertical direction compared to the first tubular section. The distribution unit includes an obturation unit selectively adopting an obturation position of the second outlet and a release position of the second output. The first and/or second outputs comprise adjustable flaps arranged to vary selectively a bypass section of the effluents through the first and second outlets. The device further comprises a tank for receiving the outgoing liquid effluent of the first and second outlets and correspondingly emerging in the dispersion pipes. The dispersion pipes are fixed, and the distribution unit is movable in rotation compared to the dispersion pipes around an axis of rotation that is approximately vertical. The tank is distributed around the axis of rotation. The first and/or second outlets have a lengthened form according to a radial direction in a projection plane approximately perpendicular to the axis of rotation. The distribution unit comprises a flexible flap suspended on the first and/or second outlets and arranged to slip on an edge of the tank when the distribution unit turns around the axis of rotation.
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