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1. Selection and Construction of Bacher Trough
The selection and construction of Bacher Trough should be based on the drainage volume, installation location, and standard specifications. The specific methods are as follows:
1. The selection method of Bacher Trough is based on the drainage volume. The size of the trough is determined according to the maximum and minimum flow rates of the drainage facilities. For example, if the maximum discharge capacity of the drainage facility is 70 cubic meters per hour and the minimum possible discharge is not, a tank that can accommodate the maximum flow rate needs to be selected. By referring to the model table, if slot 2 overflows at maximum flow, slot 3 should be selected. The accuracy of open channel flow meters can meet the measurement requirements of a minimum flow rate of 0. Confirm that each Bacher groove with a difference of one model in the standard size has a fixed size, including a contraction section, throat section, and expansion section. After selection, it is necessary to refer to the complete size table and design the height and length of the construction water tank to ensure sufficient installation space is reserved.
2. Construction steps and installation location selection for Bacher trough. Bacher trough can be installed in the middle of the circulation process (recommended by national standards) or at the end of the drainage outlet, and the specific installation location can be adjusted according to the site conditions.
. An open channel flowmeter needs to be installed above, with reserved installation space. The direction and fixation are installed according to the direction of water flow, with the contraction section facing upstream a
III. Key precautions: Model matching: It is strictly prohibited to choose a tank that may overflow at the maximum flow rate, and a safety margin should be reserved.
. Reserved space for empty and damaged areas: Before construction, the water tank should be designed according to the size of the tank to avoid rework due to insufficient space. Sealing treatment: Cement filling should be evenly and densely packed to prevent water leakage or displacement. By following the above steps, it can be ensured that the selection of the Bacher trough meets the flow requirements and the construction complies with the specifications.2. Dimensions of Bacher trough open channel flowmeter
No.2 Bacher trough is 460mm high, 774mm long, and 3214mm wide. The shape of the Bacher trough is cumbersome and more expensive than a weir, and in order to improve accuracy, the dimensions of each part of the measuring trough must be accurate.
. But there are also some advantages that other measuring devices cannot compare with: small water level loss (about one fourth of the weir), almost no sedimentation of solid substances in the water, small influence on flow velocity, and relatively small impact on the water level on the downstream side. Therefore, it is used to measure the flow rate of other liquids such as agricultural water and ind
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