Device for controlling flow The invention relates to a device for controlling the flow of rainwater, in particular runoff water, comprising a reservoir characterized in that said mainly tubular control means, in the shape of an inverted T, comprises: a plate or support (20) and its extraction arm (22), movable on at least one articulated guide rail (15, 16), said plate (20) comprising a connection cone (30) for the sealed outlet, said cone (30 ) serving as a chamber for a valve (32) preferably flexible and on a rigid support (33) with a large passage section, a diaphragm (50) with removable nozzle (51) preferably equipped with a core (53) whose mobility is facilitated by its fixing device (52), said diaphragm (50) with nozzle (51) being locked in its horizontal position by the sliding fitting of a strainer (61) preferably with slits, an overflow tube (42) also with strainer (62), said tube (42) being able to fix in place a core support (52) with pivot axis in the high position. Figure 5
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