FREEZING DEVICE FOR THE ADAPTABLE EYE ON HYDRAULIC WORKS THAT PREVENT ECOLOGICAL CONTINUITY

摘要

The invention relates to a device for providing a passability of the eel species at the level of transverse structures which are obstacles to fish migration by approaching the upstream / downstream speeds. It is represented by an assembled jacketed element (1), open at both ends, one penetrating and submerged at the bottom of the bed of a structure, the second aerial downstream of the structure. It consists of a lower right jacketed element (5) implanted horizontally under a leaf (6) whose downstream end (7) is hydraulically connected to an open bottom jacketed elbow element (8) with elevated angle, which angle gear at its second end (9) is hydraulically connected to an open jacketed straight pipe member (10), which straight member at its second end is hydraulically connected to an upper bend member (12). an angled open liner, which upper elbow element, at its second end (13), is provided with a lashing catch (14) for any fish feed or downstream accessory. The calculated geometrical configuration of the jacketed element thus assembled (1) and positioned is such that the height H (2) between the level of the upstream water line (3) and the downstream discharge water line (4) , materialized at the outlet section of the upper bend element (12), will always ensure, by the formula V = V 2 gh, a current speed equal to or less than 1.5 m / s. The device, according to the invention, is intended to meet a targeted expectation requested by the European regulation on the water law, by providing an economical solution developed to ensure the fish-crossing capability of the eel species on the transverse structures of stream.