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Flood discharge calculation

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1. Calculation formula for dam break flood

DV=Qdf-Q2. 33Wdf。 Qdf is the flow rate of a certain calculation section in Tantan caused by dam failure, Q2.33 is the average annual flow rate under the same section, and Q2.33=0: is the maximum flood width of the lead forest caused by dam failure at the same section. The larger the DV value, the greater the risk of flood disasters.

2. Three methods for flood calculation

There are three methods for flood calculation: empirical formula method, statistical analysis method, and hydrological model method.

. Flood is a water flow phenomenon caused by natural factors such as rainstorm, sudden melting of ice and snow, storm surge, etc. When rainstorm or snowmelt occurs in the drainage basin and generates runoff, it will gather at the outlet section of the river channel in order of distance. When the nearby runoff reaches, the river flow begins to increase and the water level rises accordingly, which is called a flood rising. Empirical formula method: Based on historical flood data and geographical features, use empirical formulas to estimate peak flood discharge. This method is commonly used in small watersheds or areas lacking data. The selection of empirical formulas and the determination of parameters are usually based on experience and professional judgment. Statistical analysis method: Based on statistical principles, by analyzing and processing historical flood data, infer flood frequency and peak flood discharge. Common statistical analysis methods include frequency analysis, probability distribution function fitting, and drawing flood frequency curves. Hydrological modeling method: Using hydrological models to simulate hydrological processes in a wa
Flood discharge calculation
tershed, in order to calculate peak flood discharge. Hydrological models can calculate the flood process of a watershed based on physical principles or statistical relationships, by inputting watershed characteristics, rainfall data, and other relevant parameters. Cause of flood Flood is a natural disaster, which is caused by rainstorm, rapid melting of ice and snow, storm surge and other natural factors, such as the rapid increase of water volume in Rivers and Lakes, or the rapid rise of water level. Objectively speaking, the frequent occurrence of floods has its irresistible reasons, which can be said to be the "mandate of heaven" that cannot be violated. Compared with relevant historical data, the frequency and severity of floods are quite consistent with population growth trends. It must be admitted that Chinas rapid population growth, expansion of arable land, reclamation of lakes, and indiscriminate logging are constantly changing the surface conditions, altering the convergence conditions, and exacerbating the severity of floods. The abundance or deficiency of precipitation is determined by the heavens, while the regulation and management of water are determined by humans. In years with high precipitation, whether floods cause disasters and the magnitude of flood disasters cannot be separated from human factors. Long term forest disturbance and destruction are important reasons for it.

3. What is the flow calculation for arch dam flood discharge?

(1) Intersection method of wave flow and weir flow;

(2) Saint Venants formula: Om 8 BH2=27 Vg (3) Shockleys formula: Om=0.9 [H/(H-0.827)] BH3/2

(4) American Watercourse Test Station formula: gm 27V8 (B/b) 02b1 ÷ 28=For local material da

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