SU44486A1 - Device for preventing the intake of fish fry by a pumping station - Google Patents

Description

The invention relates to a device for preventing the ingestion of fish fry by a pumping station using barrier nets, and that at the entrance to the water diversion channel of the pumping station a louvre-like grille is installed parallel to the direction of the river, between the inclined partitions of which are horizontal maintaining the required throughput of the mesh barrier without increasing the speed of water flowing through these barriers, due to the increase in the total area adi nets. “In FIG. 1 shows a cross section of the device and FIG. 2 shows the layout of the device.

The louvre-like lattice 2 (Fig. 2) consists of wooden or galvanized iron partitions 5 (Fig. 1) located obliquely, and of small metal grids b reinforced horizontally between the partitions. The device is located at the beginning of the drainage channel / pumping station and the height of the grate is equal to the height of the minimum water level 3 in the river above the bottom of the canal, for those reasons that the grate is always under water to reduce the possibility of clogging by floating bodies on the surface of the river. The total area of all barrier nets b should be of such a size that the barrier can pass the required water flow into the canal, taking into account the hydraulic losses in the net barrier. The drawing shows the maximum level 4 in the river and the solid barrier 7 above the grating.

The operation of the device is as follows. Fish fry follow the course of the river, the passage near the barrier and for the most part are carried away by the flow of the river, much more than the suction speed of the channel. Part of the fry, which will nevertheless be pushed by the flow of water into the canal, encountering an obstacle mesh, for some time there is no jamming on its outer surface; since the net will not let the fry into the canal, they will be forced to sail into the river, having the opportunity to overcome a short distance with their weak forces and will be carried away by the river further.

The subject matter of the invention.

A device for preventing the intake of fish fry by a pumping station using barrier nets, characterized in that a river is installed in the river at the entrance to the water outlet channel

parallel to the direction of the river flow is a louvre-like grille, between inclined partitions 5 of which grids b were reinforced horizontally (or almost horizontally), in order to maintain the required throughput of the mesh barrier without increasing the water flow rate through the barrier, due to the increase in the total area of the grids.

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