passability device for the eel adaptable to the hydraulic structures which form an obstacle to the continuity ecological

摘要

The present invention relates to a device making it possible to provide a passability of the species eel at the level of the transverse structures which are of the obstacles to the migration fish by bringing the upstream / downstream. It is represented by a lined assembled element (1), open at its two ends, a penetrating and immersed in the bottom of the upstream bed of a construction, the second, air downstream of the text. It is constituted by a lined with a lower element (5) installed horizontally beneath a vantelle (6), its downstream end (7) is connected hydraulically to an element of the lower bend (8) is deflated and open at an angle gear in elevation, which, at its second end (9), is hydraulically connected to a straight element of the pipe (10) lined open, which straight element, at its second end, is hydraulically connected to an element of the upper bend (12) is deflated and open at an angle gear, which element of the upper bend, at its second end (13), is provided with a latch anchoring (14) to any accessory of the ear emergence or outmigration fish. The calculated geometrical configuration of the element to be lined thus assembled (1) and positioned such that the height h (2) between the level of the water line upstream (3) and the water line of discharge the downstream end (4), indicated at the level of the outlet section of the element of the upper bend (12), will still, by the formula v = v 2 g, h, a speed of the current of less than or equal to 1,5 m / s. the device according to the invention is designed to respond to a standby targeted stressed by the european regulations on the law on the water, by offering an economical solution developed in order to ensure the passability fish of the species eel on the transverse structures water.