Technical measures of the facility
Production practices have proved that in the large-water surface culture, fish-repelling equipment should be constructed. Here are three common methods used to build a reservoir spillway to stop fish facilities:
1. Bamboo foil fish is mainly used in the outlets of Shantang and small reservoir spillways. When erecting, first pulverize the bamboo into 1 to 2 cm of foil, and use a fine brown cord to make a bamboo curtain. Then place two rows of bamboo piles side by side where the fish trap equipment was built. Into the mud 1 to 2 meters. Distance between bamboo piles: A row of the lower surface (back surface) is about 1 meter, a row of the upper surface (also called the facing surface) is about 2 meters, and the distance between two rows of bamboo piles is about 10-20. cm. In these bamboo piles, several levels of bamboo are tied up and down to be connected and Fixed. Finally, insert the bamboo curtain between the two rows, the bottom into the mud 10 to 20 cm, the upper end of the water level 1 meter. Use bamboo or brown ropes to fasten on bamboo piles and horizontal bamboo. In order to prevent the dumping, add 1 pile at a certain distance and support the bamboo foil diagonally. With bamboo foil to stop fish, due to greater resistance, when the flow rate of water is too large, it should not be used. The general flow rate cannot be greater than 0.3 meters per second. In order to reduce the water pressure and increase the filtration area, the bamboo foil can be built into a "V" shape at a large flow rate. In some places, the bottom is a rock bottom or a stone bottom, which can be replaced by stone or brick piers, or cemented, cement and concrete columns.
2. Barrier bars are made of steel, angle iron or wire mesh. It is used at the reservoir's water tunnel and spillway. The size of the hole is determined by the size of the stocked fish. For example, with wire mesh, a mesh of 3 cm mesh can be made from 12 to 14 iron wires, framed with triangular iron, and the wire mesh inserted into the gate. The general level of the barrage is better than barbed wire and is not easily blocked by dirt and can be easily cleaned. It is best to make the iron fence active. First, put the iron fence in the wooden frame or iron frame, make a grid of blocks, and then insert it into the “gate frame†made of angle iron or cement, and the upper end is also high. About 1 meter out of the water. The intercepted area is small, narrow in width, and a “gate hole†is sufficient. If the area is large and the width is wide, several “gate holes†should be set. In this way, it is easy to replace and repair, but also can replace the iron or wire mesh of different holes. The resistance of the grid to the flow of water is small, but the cost is high.
3. Nylon nets have large filter area, low resistance to water, convenient material acquisition, low cost, simple installation, and large and small reservoirs. Nylon-blocking fish nets are installed at the spillway, and a row of cement pillars can be poured at intervals of 5 to 6 meters. Angle iron can also be used instead. Then use coarse wire as the upper and lower part, hang the nylon net, and stop the entire spillway. Spilled when spilled, removed after flood. Large floats can also be added on the Internet, such as large oil barrels, bamboo, etc., so that the net rises and falls with the water level. When hanging the net, it should be 1 meter above the maximum water level to prevent fish from jumping out of the net. Water flows through the water in the entrance to the water and the fish is also vulnerable to rapids and damages the fish. A nylon mesh can be laid semi-circularly at a distance from the hole and at a smooth water flow. The upper floater is added to the upper class, the heavier iron chain sinker is added to the lower class, and the floater class is fixed with iron anchors or large stones.
Stop fish facilities construction, the flow rate can not be too large. For stocking 10 to 16 cm of fish, the flow rate should not be greater than 0.5 meters per second. Otherwise, fish species will not be able to overcome the rapids and will be squeezed to death on the fish killing equipment. When building a fish-sheltering facility, it should not be too narrow to ensure that the fish-breaking facilities do not collapse or break. Some reservoirs float a lot of debris during floods. A trash rack or net should be added before the fish facilities.
Production practices have proved that in the large-water surface culture, fish-repelling equipment should be constructed. Here are three common methods used to build a reservoir spillway to stop fish facilities:
1. Bamboo foil fish is mainly used in the outlets of Shantang and small reservoir spillways. When erecting, first pulverize the bamboo into 1 to 2 cm of foil, and use a fine brown cord to make a bamboo curtain. Then place two rows of bamboo piles side by side where the fish trap equipment was built. Into the mud 1 to 2 meters. Distance between bamboo piles: A row of the lower surface (back surface) is about 1 meter, a row of the upper surface (also called the facing surface) is about 2 meters, and the distance between two rows of bamboo piles is about 10-20. cm. In these bamboo piles, several levels of bamboo are tied up and down to be connected and Fixed. Finally, insert the bamboo curtain between the two rows, the bottom into the mud 10 to 20 cm, the upper end of the water level 1 meter. Use bamboo or brown ropes to fasten on bamboo piles and horizontal bamboo. In order to prevent the dumping, add 1 pile at a certain distance and support the bamboo foil diagonally. With bamboo foil to stop fish, due to greater resistance, when the flow rate of water is too large, it should not be used. The general flow rate cannot be greater than 0.3 meters per second. In order to reduce the water pressure and increase the filtration area, the bamboo foil can be built into a "V" shape at a large flow rate. In some places, the bottom is a rock bottom or a stone bottom, which can be replaced by stone or brick piers, or cemented, cement and concrete columns.
2. Barrier bars are made of steel, angle iron or wire mesh. It is used at the reservoir's water tunnel and spillway. The size of the hole is determined by the size of the stocked fish. For example, with wire mesh, a mesh of 3 cm mesh can be made from 12 to 14 iron wires, framed with triangular iron, and the wire mesh inserted into the gate. The general level of the barrage is better than barbed wire and is not easily blocked by dirt and can be easily cleaned. It is best to make the iron fence active. First, put the iron fence in the wooden frame or iron frame, make a grid of blocks, and then insert it into the “gate frame†made of angle iron or cement, and the upper end is also high. About 1 meter out of the water. The intercepted area is small, narrow in width, and a “gate hole†is sufficient. If the area is large and the width is wide, several “gate holes†should be set. In this way, it is easy to replace and repair, but also can replace the iron or wire mesh of different holes. The resistance of the grid to the flow of water is small, but the cost is high.
3. Nylon nets have large filter area, low resistance to water, convenient material acquisition, low cost, simple installation, and large and small reservoirs. Nylon-blocking fish nets are installed at the spillway, and a row of cement pillars can be poured at intervals of 5 to 6 meters. Angle iron can also be used instead. Then use coarse wire as the upper and lower part, hang the nylon net, and stop the entire spillway. Spilled when spilled, removed after flood. Large floats can also be added on the Internet, such as large oil barrels, bamboo, etc., so that the net rises and falls with the water level. When hanging the net, it should be 1 meter above the maximum water level to prevent fish from jumping out of the net. Water flows through the water in the entrance to the water and the fish is also vulnerable to rapids and damages the fish. A nylon mesh can be laid semi-circularly at a distance from the hole and at a smooth water flow. The upper floater is added to the upper class, the heavier iron chain sinker is added to the lower class, and the floater class is fixed with iron anchors or large stones.
Stop fish facilities construction, the flow rate can not be too large. For stocking 10 to 16 cm of fish, the flow rate should not be greater than 0.5 meters per second. Otherwise, fish species will not be able to overcome the rapids and will be squeezed to death on the fish killing equipment. When building a fish-sheltering facility, it should not be too narrow to ensure that the fish-breaking facilities do not collapse or break. Some reservoirs float a lot of debris during floods. A trash rack or net should be added before the fish facilities.
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