Solution to ichthyofauna migration!

1. Solutions to ichthyofauna migration upstream – downstream of the discharge sill in
the neighborhood of Dacia Bridge, the city of Oradea
Ph.d Răzvan Voicu
getiiliberi@gmail.com, rzvnvoicu@yahoo.com,
Solution I
There are lots of discharge sills in the town of Oradea, namely: Centre Hall, CFR
bridge, Dacia Bridge etc., that inhibit migration of ichthyofauna. Through this study, I
propose two solutions to ichthyofauna migration upstream – downstream of the discharge
sill in the neighborhood of Dacia Bridge (fig.1).
first buttress second buttress left bank abutment
discharge sill first sluiceway second sluiceway
the Crisul Repede River
Figure 1 Discharge sill in the neighborhood of Dacia Bridge
The first solution to ichthyofauna migration upstream – downstream of the Crisul
Repede River is to build a parallelepiped rectangular metallic basin provided with a side
canal(fig. 2).

2. side canal
mobile basin
Figure 2 Positioning rectangular parallelepiped provided with a side canal-indicative
scheme
The dimensions of the basin that captures ichthyofauna downstream of the
discharge sill are calculated based on the water level downstream of the discharge sill.
Apart from the horizontal surface on a higher plane (metal grid), all other surfaces that
form the rectangular parallelepiped are compact surfaces (fig.3).
basin for ichthyofauna migration
Figure 3 Positioning the basin for ichthyofauna migration- indicative scheme
The basin for ichthyofauna migration is provided with a loophole in the vertical
surface and than a rectangular canal (fig. 4).

3. canal
Figure 4 Loophole in the vertical surface- indicative scheme
Three areas of the basin are equipped with automatic opening and closing
windows allowing the ichthyofauna entering this basin (fig.5).
windows allowing the ichthyofauna entering this basin
Figure 5 Position of the window for ichthyofauna entering the basin- indicative scheme
On the outside, the mobile basin is equipped with two telescopic hydraulic
cylinders so that the basin can be lifted above the discharge sill (fig.6).

4. ichthyofauna basin
the Crisul Repede River
discharge sill
telescopic hydraulic cylinders
Figure 6 Position of the telescopic hydraulic cylinders - indicative scheme
In order for the ichthyofauna in the mobile basin to migrate above the discharge
sill in the neighborhood of Dacia Bridge, a rectangular channel for ichthyofauna
migration must be fixed to the discharge sill using metal hinges (fig.7).

5. the Crisul Repede River metal hinges
rectangular canal
discharge sill
telescopic hydraulic cylinder
the Crisul Repede River
Figure 7 Fixing the rectangular canal for ichthyofauna migration using metal hinges-indicative
scheme
At the end of the rectangular canal where no metal hinges are provided, a bearing
and a telescopic hydraulic cylinder are fixed by two metal bars (fig. 8).

6. bearing
rectangular canal
bearing
metal bar
discharge sill telescopic hydraulic cylinder
Figure 8 Fixing telescopic hydraulic cylinder- indicative scheme
The rectangular canal reaches the Crisul Repede River downstream of the
discharge sill, being able to undertake the ichthyofauna coming down. But this channel is
designed specifically to undertake the ichthyofauna in the rectangular basin (fig.9). One
of telescopic hydraulic cylinders has a higher lifting degree than the other so that the
mobile basin will slide to the loophole built into one of the vertical surfaces of the mobile
basin. In the top of the other telescopic hydraulic cylinder is an metal spiral arc for the
movement of the ichthyofauna basin. The loophole is provided with a window that opens
automatically when the second telescopic hydraulic cylinder reaches the maximum point.
All ichthyofauna will be taken by the rectangular canal provided with metal hinges.

7. ichthyofauna basin
the Crisul Repede River
discharge sill
The Crisul Repede River
the Crisul Repede River
telescopic hydraulic cylinders
metal hinges
Figure 9 The general scheme of the ichthyofauna migration system- indicative scheme
According to the (fig.9), the connection between the canal of the mobile basin for
ichthyofauna migration and the rectangular canal fixed on the discharge sill is perfect due
to mobility of the two canals. The slope between the two channels is required by the
migratory fish species but, is generally the local slope of the Crisul Repede River. The
solution can be successfully applied anywhere in the world.

8. Solution II
Another possibility for the migratory ichthyofauna in the Crisul Repede River to
cross the discharge sill upstream – downstream is to create a sliding winch system. Two
cables are passed over the winchs supporting two basing on both sides of the discharge
sill in the neighborhood of Dacia Bridge (fig.1).
basin B2 for ichthyofauna
metal cable winchs
basin B1 for ichthyofauna
semicircular tubes supporting
the basin B1 for ichthyofauna
the Crisul Repede River
discharge sill
metal bar supporting the basin B1 for ichthyofauna
metal bar supporting the basin B2 for ichthyofauna
Figure 1 Supporting the basins on both sides of the discharge sill- indicative scheme
The basins B1 and B2 are attached to the bars by means of some semicircular
tubes sliding on these bars(fig.2).

9. metal bar supporting the basin B1 for ichthyofauna
semicircular tube welding
metal bar
Figure 2 System fixing the metal bar supporting the basin B1for ichthyofauna to the
discharge sill- indicative scheme
The basin B1 is fixed to the two support bars by the means of two other metal
bars welded to four semicircular tubes (fig 3).
basin B1 for ichthyofauna migration
semicircular tube
metal bars supporting the basin B1
system fixing the ichthyofauna basin B1 to the metal bar
Figure 3 System fixing the ichthyofauna basin B1 to the metal bars by the means of
some semicircular tubes - indicative scheme

10. The same fixing system is used for basin B2 except that the fixing system
connecting the metal bar to the basin B2 is made of two horizontal bars (fig. 4).
metal bars supporting the basin B2
the basin B2
semicircular tube
fixing system connecting the metal bar to the basin B2 for ichthyofauna
Figure 4 Fixing system connecting the basin B2 to the metal bars by the means of the
semicircular tubes- indicative scheme
The basin B2 is also fixed to two telescopic hydraulic cylinders designed to lift
the basin B2 above the discharge sill in the neighborhood of Dacia Bridge (fig.5).

11. semicircular tube the basin B2
discharge sill
telescopic hydraulic cylinder
telescopic hydraulic cylinders
Figure 5 Fixing the basin B2 to the telescopic hydraulic cylinders- indicative scheme
A metal pile provided with hinges at the bottom is attached to the surface near the
discharge sill on the basin B2 (fig.6).

12. basin B2
metal pile
metal hinges
electric motor
the Crisul Repede River
discharge sill the Crisul Repede River
telescopic hydraulic cylinder
Figure 6 Position the metal pile and electric motor positioning- indicative scheme
When the basin reaches the maximum level, an electric motor attached to a
surface of the basin B2 opens the pile that reaches the Crisul Repede River. When the
metal pile has been folded completely and being parallel to the discharge sill, then the
window for ichthyofauna access can be folded vertically (fig.7). Thus all the
ichthyofauna in the basin B2 goes downstream of the discharge sill. The access window

13. for ichthyofauna is situated between the two pulleys. During this time, the basin B1 sinks
into the Crisul Repede River because the two basins are connected by some metal wires.
basin B2
window for ichthyofauna discharge
the Crisul Repede River
electric motor
metal hinges
discharge sill the Crisul Repede River
telescopic hydraulic cylinder
Figure 7 Water discharge system from the basin B2- indicative scheme
Thus all the ichthyofauna in the basin B2 goes downstream of the discharge sill.
The access window for ichthyofauna is situated between the two winchs. During this

14. time, the basin B1 sinks into the Crisul Repede River because the two basins are
connected by some metal wires.In order to help ichthyofauna go upstream the discharge
sill we use the mobile basin B1. Being fixed to the basin B2 by metal cables, the basin B1
will slide on the metal bars when the basin B2 sinks totally into the Crisul Repede River
(fig.8). Due to the electric motor attached to the first buttress, the telescopic hydraulic
cylinders fold until they reach the minimum level (fig. 8). When the telescopic hydraulic
cylinders reach the minimum level, the basin B1 reaches the maximum level.
winchs
basin B1
access window for ichthyofauna
basin B2
the Crisul Repede River
discharge sill the Crisul Repede River
telescopic hydraulic cylinder
Figure 8 The maximum level of the basin B1- indicative scheme

15. windows for ichthyofauna access
basin B1
window for ichthyofauna discharge
electric motor
the Crisul Repede River
discharge sill the Crisul Repede River
Figure 9 Positioning the electric motor- indicative scheme
On similar terms, the basin B1 is provided with a metal pile redirecting the
ichthyofauna and also with a window for ichthyofauna discharge. Both are driven by an
electric motor attached to the basin B1 (fig.9). Both B1 and B2 mobile basins are
provided with some windows for ichthyofauna access, other than for ichthyofauna
discharge. Ichthyofauna is guided towards both basins B1 and B2 by the means of some
electromagnetic field generators set in the ground or on floating systems (fig. 10).
These generators will operate separately depending on the period of ichthyofauna
migration. When the basin B1 automatically moves, the generators of the basin B2 switch

16. off, and when the basin B2 automatically moves, the generators for the basin B1 switch
off. When there is no migration, the two basins will remain steady into the Crisul Repede
River. If there is no more ithtiofauna left, the whole system can be disassembled and
reassembled, then and can be also used for other discharge sills successfully.
.

17. window for ichthyofauna discharge
electromagnetic field generators
windows for ichthyofauna access
metal grid
B2
windows for ichthyofauna access
window for ichthyofauna discharge
electromagnetic field generators
metal grid
discharge sill
the Crisul Repede River
Figure 10 Positioning the electromagnetic field generators- indicative scheme

18. A generator using the energy provided from the Crisul Repede River can be
arranged on the discharge sill so that if operating a system for ithtiofauna migration less
power from other sources to be consumed. In order to stop the migratory species crossing
the discharge sill without reaching the basin B2, a metal grid shall be fixed on the edge of
the discharge sill (upstream) (fig.10). When migrating, the fish will gather in front of the
metal grid and, therefore, the basin B2 will catch as many fish as possible so that the
migration process can be carried out normally. The solution can be successfully applied
anywhere in the world.