Study on Design Rainstorm Profile in Liuzhou City Based on Pilgrim &amp;amp; Cordery Method

Su, Xiaoling; Xie, Dong; Liu, Lei; Liang, Chun-Rong; Liu, Zhourong; Liu, Yu; Qiu, Lan; Ren, Luping

doi:10.4236/gep.2019.73007

Cited by 3 publications

(2 citation statements)

References 5 publications

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“…According to recent research, the majority of them use the Chicago hyetograph method or the Pilgrim and Cordery (PC) method to conduct research on urban rainstorm pattern design [24]. Currently, the Chicago hyetograph method is widely used and recommended by the China Meteorological Administration and the Ministry of Housing and Construction [27].…”

Section: Introductionmentioning

confidence: 99%

Design Hyetograph for Short-Duration Rainstorm in Jiangsu

Yang

Xiang

et al. 2022

Atmosphere

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The rainstorm intensity formula and the design of rainstorm hyetographs are important aspects in drainage design standards. Against the backdrop of climate change, in most cities in Jiangsu Province of China, significant trends of increasing intensities of heavy rainfall are apparent. The parameters of the rainstorm intensity formula are no longer applicable in the current context of significantly stronger rainstorms. To adapt to this change, we first contrasted the fitting accuracy of the Gumbel distribution, the exponential distribution, and the Pearson III distribution for the rainstorm intensity formula in Jiangsu. It was found that the Gumbel distribution has the smallest relative mean square error in most cities, proving that it provides the best estimation of rainstorm intensity formula parameters. Therefore, the rainstorm intensity formula parameters for 13 cities was revised using the Gumbel distribution based on the rainfall data from 1991 to 2020. Then, the precipitation with a 100-year return period was calculated using the revised formula. Moreover, to compensate for the lack of storm hyetographs that have been designed for Jiangsu, we designed short-duration rainstorm hyetographs for 13 cities using the Chicago hyetograph method and the Pilgrim and Cordery (PC) method. The results show that most of the short-duration rainstorms lasted between 45 and 120 min and were dominated by single-peaked patterns, with the peak position typically occurring in the first half of the rainfall cycle. The peak coefficient distribution of short-duration rainstorms shows that short-duration rainstorms in the south reached their peak rainfall intensity earlier than those in the north. On this basis, using the Chicago method and PC method, short-duration storm hyetographs were designed, which could be used in the design of drainage systems to provide support in effectively reducing urban flood threats. By comparing the hyetographs with real short-duration rainstorm patterns, it was found that the precipitation process designed using the PC method was most similar to the actual precipitation process. However, the PC method was found to be highly dependent on local precipitation data, whereas only the rain peak coefficient is required to design the Chicago rainstorm hyetograph. Therefore, we primarily recommend hyetographs designed using the PC method for Jiangsu Province’s 13 major cities, while we recommend the Chicago hyetograph for the surrounding areas of the 13 cities that have no meteorological stations or lack data.

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Section: Introductionmentioning

confidence: 99%

Design Hyetograph for Short-Duration Rainstorm in Jiangsu

Yang

Xiang

et al. 2022

Atmosphere

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“…Hershfield (1961Hershfield ( , 1965 believes that this method must have abundant rainfall data. In recent years, India, Bhutan and other countries have also applied this method to specific practical applications and verified its accuracy (Ouyang et al 2019;Rosario et al 2019;Su et al 2019). In addition, the more commonly used method is the generalized estimation method, which is widely used in countries such as the United States (Douglas & Barros 2003) and Australia.…”

mentioning

confidence: 99%

Study on the time conversion method of early warning indicators of flash flood disaster: A case of Qufu City, Shandong Province

Teng

Zhang

et al. 2023

Water Science &Amp; Technology

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To solve the problem of imperfect flash flood warning indicators in mountainous watersheds, this study proposes a conversion method of critical rainfall for different warning periods on the basis of the existing stormwater calculation formulae and applies it to typical mountainous watersheds. The specific method is to use the multiplicative power function method to interpolate and extend the early warning indicators of other time periods through the known early warning indicators of some time periods, apply them to Hengmiao Village and Gaolou Village, typical disaster prevention objects in Qufu City, Shandong Province, China, and verify the rationality of the results. The results show that the multiplicative power function method interpolates and extends the early warning indexes of 0.5, 1, 3, 6, 12, and 24 h under the same soil moisture condition. Based on the historical actual mountain flood disaster rainfall, the correlation coefficient R2 and Nash coefficient Ens are calculated to be 0.85 and 0.86, respectively, which verifies the applicability of this method. This study provides a convenient and quick way to unify the time series of regional early warning indicators and a feasible way for other regions to study regional overall early warning.

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Application of Chicago Hyetograph Method to Heavy Rainfall Equations of an Alternative Model Obtained by Disaggregating Daily Rainfall

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2024

Eng. Agríc.

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Determining hydrographs for hydraulic works projects such as dams and reservoirs requires the definition of the design rainfall hyetograph. The Chicago method stands out as one of the most used methods, with the advantage of being easy to apply. However, the dependence on traditional and updated IDF equations can be pointed out as a limitation of the method. This study aimed to adapt and apply the Chicago hyetograph method with the intense rainfall equations of the alternative model, which stands out for its ease of obtaining and updating. The equations for estimating rainfall intensities for the duration before and after the peak of the hyetograph were presented. The equations were also adapted to obtain the accumulated depths or volumes of rainfall before and after the peak of the hyetograph. This information allows us to easily obtain the rainfall blocks for each interval of the hyetograph. The method was applied to determine the hyetograph based on the maximum daily rainfall, demonstrating each calculation step. The equations presented here can be implemented in electronic spreadsheets or programming routines, allowing Engineering professionals to apply methods that are more appropriate to local data.

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Study on Design Rainstorm Profile in Liuzhou City Based on Pilgrim & Cordery Method

Cited by 3 publications

References 5 publications

Design Hyetograph for Short-Duration Rainstorm in Jiangsu

Design Hyetograph for Short-Duration Rainstorm in Jiangsu

Study on the time conversion method of early warning indicators of flash flood disaster: A case of Qufu City, Shandong Province

Application of Chicago Hyetograph Method to Heavy Rainfall Equations of an Alternative Model Obtained by Disaggregating Daily Rainfall

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