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『Calculation formula for peak flow rate』Related information(clamp on meter|electromagnetic meter|venturi meterrotameter|orifice meter|ultrasonic flow meter|mass flow meter|coriolis mass flow meter|coriolis flow meter|magnetic flow meter|magmeter flow meter|magflow flow meter|mag meter flow meter|electromagnetic flow meter|vortex flow meter|turbine flow meter|thermal mass flow meter|thermal flow meter|rotameter flow meter)
1. What is the peak flow runoff coefficient?
The peak flow runoff coefficient is a quantitative indicator of the proportional relationship between the maximum instantaneous flow during a flood process and the runoff formed by rainfall or snowmelt. A detailed explanation of the peak flow runoff coefficient is given under the guidance of Qiqichen. The definition of peak flow is instantaneous maximum value, which refers to the maximum instantaneous value reached by the flow during a flood flow process. Measurement and Calculation: This value may be obtained through actual measurement, calculated using the water level flow relationship curve, or calculated using hydraulic formulas. The meaning of runoff coefficient: proportional relationship: runoff coefficient is usually used to describe the proportional relationship between the runoff formed by rainfall or snowmelt and the total precipitation. However, in the context of peak flow, the runoff coefficient can be extended to refer to one of the factors that affect the magnitude of peak flow, namely the efficiency of converting rainfall or snowmelt into river flow. Influencing factors: The runoff coefficient is influenced by various factors, including soil type, vegetation cover, topography, and rainfall intensity. The relationship between peak flow and runoff coefficient: correlation: Although peak flow and runoff coefficient are two different concepts, they are closely related. The magnitude of the runoff coefficient directly affects the peak flow rate of the beam. Under the same rainfall conditions, the larger the runoff coefficient, the more rainfall is converted into river flow, resulting in higher peak discharge. Practical application: In flood forecasting and
2. Empirical formula for peak attenuation
The empirical formula for peak attenuation is not a specific and widely recognized formula, but an empirical expression summarized based on regional hydrological observation data.
. The following is a detailed explanation of the formulas and methods related to peak flow calculation:1. Reasoning formula method Reasoning formula method is a commonly used method for calculating peak flow. It involves many parameters, such as peak runoff coefficient, rainfall force, catchment concentration time, rainstorm attenuation index and catchment area. These parameters are combined through specific formulas to calculate peak discharge. For example, there is a reasoning formula: Qm=0.278 psi (s/τ ^ n) F. Where, Qm is the peak flow, ψ is the peak runoff coefficient, s is the rainfall force, τ is the convergence time of the basic drainage basin, n is the rainstorm attenuation index, and F is the drainage area. This method can comprehensively consider the impact of rainfall and watershed characteristics on the peak flow of flood waves. Secondly, in some regions, based on long-term hydrological observation data, empirical formula methods may be used to summarize peak flow rates that are suitable for t