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1. Bachers Trough Principle
Bachers Trough Principle: The larger the flow rate in an open channel, the higher the liquid level; The smaller the flow rate, the lower the liquid level. For general channels, there is no definite correspondence between liquid level and flow rate. Because the same water depth and flow rate are also related to the cross-sectional area, slope, and roughness of the channel. Installing a measuring weir groove in the channel, due to the smaller cross-sectional area of the weir gap or groove contraction compared to the channel, the correspondence between the upstream water level and flow rate of the channel mainly depends on the geometric dimensions of the weir groove. The same measuring weir tank is placed on different channels, and the same liquid level corresponds to the same flow rate. The measuring weir channel converts the flow into liquid level. By measuring the liquid level of the water flow in the measuring weir tank, and then reverse calculating the flow rate based on the corresponding water level flow relationship of the measuring weir tank. Parshall flume, also known as Bab flume, is an auxiliary device for measuring open channel flow. The prototype is a Venturi water tank, and the latter experiment was conducted by VM. Cone in Colorado, USA in 1915. In 1922, F.L. Marshall made a fundamental change to this and created the now widely used Bachel groove. Subsequent hydraulic experiments were repeated multiple times, resulting in various measuring tanks ranging in size from 1 inch to 50 inches. The name Bacher Trough was given by the American Civil Society in 1929. Afterwards, many countries such as the United Kingdom, Switzerland, Italy, India, Argentina, etc. also proposed var
2. Parshall flume 1: Introduction
Parshall flume, also known as Bab flume, is an auxiliary device for measuring open channel flow.
. The prototype is a Venturi water tank, and the latter experiment was conducted by VM. Cone in Colorado, USA in 1915. In 1922, F.L. Marshall made a fundamental change to Youma Chan and created the now widely used Bacher groove. Subsequent hydraulic experiments were repeated multiple times, resulting in various measuring tanks ranging in size from 1 inch to 50 inches. The name of the Bacher burial trench was given by the American Civil Society in 1929. Afterwards, many countries such as the United Kingdom, Switzerland, Italy, India, Argentina, etc. also proposed various types of design schemes for Venturi water tanks and conducted experiments, but the Bachel tank is still the most popular tank in Venturi water tanks.3. What are the characteristics of the Bacher groove and the principle of measuring water? Please provide a detailed introduction.
The prototype of the Parshall flume is the Venturi flume, which was experimented with by VM. Cone in Colorado, USA in 1915.. In 1922, F.L. Marshall made a fundamental change to this and created the now widely used Bachel groove. Subsequent hydraulic experiments were repeated multiple times, resulting in various measuring tanks ranging in size from 1 inch to 50 inches. The name Bacher Trough was given by the American Civil Society in 1929. Afterwards, many countries such as the United Kingdom, Switzerland, Italy, India, Argentina, etc. also proposed various types
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