Formula for calculating canal flow rate | How to calculate the water flow rate of a canal?

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A water flow rate of 1.0.5 cubic meters per second requires channels of different widths and heights. The flow rate is related to the flow velocity and cross-sectional area. The cross-sectional area is (1+1.5) x1.2 ÷ 2=1.5 (square meters). If the cross-sectional area remains constant and the flow velocity is 1 meter per second, the flow rate is equal to the flow velocity multiplied by the cross-sectional area, which is 1 x 1.5=1.5 (cubic meters/He Hong seconds). The flow rate is 3 meters per second, and the flow rate is equal to the flow velocity multiplied by the cross-sectional area, which is 3 x 1.5=4.5 (cubic meters/second). The calculation of the weir flow rate is based on a specific formula. The key parameters include H0 (weir head, equal to H plus). The square of the upper inlet velocity v0 divided by 2g, the flow coefficient m, the lateral contraction coefficient ε, and the submergence coefficient σ. The value of m is affected by the inlet size of the weir and δ/H. Tongzhou Zhaoxin often obtains specific empirical formulas for thin-walled weirs, practical cross-section weirs, and wide crest weirs through experiments. M0 takes into account the influence of near velocity head. The coefficient of lateral contraction ε is related to the size of the diversion canal and weir, and is experimentally determined. When there is no lateral contraction, the value of ε is 1. The submergence coefficient σ is generally determined based on experimental data of thin-walled weirs, practical cross-section weirs, and wide crest weirs, and is related to H0. When flowing in a free weir, σ is equal to 1. The gravitational acceleration g is a fundamental physical constant. Thin walled weir, as the main tool for flow measurement, usually measures the water head H at a distance of more than three times the upstream water head from the weir wall. For a rectangular mouth with no side contraction free thin-walled weir, the flow formula is proportional to the square of Q and H to the power of 1.4, with the formula Q=1.4H ^ 2.5. The flow formula for a weir with a right angled triangle mouth is different, but the applicable simplification condition is that H1 (upstream head) is at least twice H, and the width of the weir mouth B is greater than 3 to 4 times H. Extended information on the slow flow of open channels over obstacles in the channel caused by buildings. Obstacles are called weirs. In engineering, obstacles include dams, bridges, culverts, overflow equipment, etc., which raise the upstream water level and have a lateral contraction and bottom constraint effect on the weir flow. The rapid flow of open channels over obstacles produces hydraulic phenomena different from weir flow. When passing through the side contraction section, a shock wave occurs. Weir flow mainly studies the relationship between the flow rate Q of water flowing through the weir and other characteristic quantities. Representing the characteristic quantity of weir flow, in addition to flow rate, there are also: weir width b, which is the width of water flow over the weir crest; The water depth at the top of the weir is recorded as wheel H, which represents the maximum superelevation of the upstream water level on the weir crest; The thickness of the weir wall, δ, and its cross-sectional shape; The downstream water depth h and the height of the downstream water level above the bottom sill.

3. The rectangular canal is 800m long, 4m wide, and 2.5m high, with a depth of 2m. Th

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