Calculation formula for peak flow rate| Beihai ultrasonic flowmeter manufacturer

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Is the convergence area greater than the rainfall area?

The convergence area may not necessarily be greater than the rainfall area, because the rainfall in every place is directly related to many factors.. And for an area like this, there may be a significant correlation between the net flow and weather in a region.

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 the local area. These formulas usually consider the main influencing factors such as watershed area, river slope, and rainfall characteristics. For

example, there may be a formula for a specific region: Qm=C × F ^ a × J ^ b. Among them, C, a, and b are empirical coefficients fitted based on local measured data. In addition, there are empirical formulas that use watershed area as a parameter, such as Q=Av (where A is the watershed area and v is a coefficient or function related to the region and flood frequency). These empirical formulas can reflect the influence of regional hydrological characteristics, but attention should be paid to their applicability and limitations when using them. It should be noted that due to the influence of various factors on peak attenuation, adjustments and verifications need to be made based on local hydrological conditions and observation data in practical applications. Meanwhile, for specific empirical formulas for peak attenuation, it may be necessary to further consult relevant hydrological manuals or research results to obtain more detailed information.

3. How to calculate the flood recurrence period of a certain hydrological station

The core of calculating the flood recurrence period is to use hydrological frequency analysis, based on measured and surveyed flood data, combined with statistical methods to calculate the long-term average occurrence period of a certain level of flood. The mainstream method in China is to use the Pearson III distribution fitting method to complete the calculation.

. 1. Collect and organize basic data: Collect measured peak flow and flood volume data from hydrological stations over the years, interpolate flood data for missing years through neighboring station data, rainfall runoff relationships, and other methods, synchronously conduct historical flood investigations, supplement reco

Calculation formula for peak flow rate

Is the convergence area greater than the rainfall area?

2. Empirical formula for peak attenuation

3. How to calculate the flood recurrence period of a certain hydrological station

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