Report No. : GEO Report No. 331

Report Title : 4-hour Probable Maximum Precipitation (PMP) Updating Study in Hong Kong (2017), 121 p.

Author : B. Lin

Abstract

The updating study of the 4-hour Probable Maximum Precipitation (PMP) in Hong Kong was completed by Professor LIN Bing-zhang of Applied Hydrometeorological Research Institute, Nanjing University of Information Science and Technology in January 2017. In this updating study, the international best practice for the estimation of 4-hour PMP in Hong Kong was adopted by using the state-of-the-art storm transposition analysis with consideration of moisture maximisation. The approach and overall procedures is updating study are the same as those adopted in the previous 24-hour PMP updating study as reported in GEO Report No. 314. Available rainfall data in the Southeast China region, including Hong Kong, Macao, Guangdong, Fujian, Zhejiang and Taiwan, have been considered. The data cover generally 2 decades in the period between 1995 and 2015. The new Depth-Area-Duration (DAD) curve for the 4-hour PMP in Hong Kong was produced, and a comparison of the new 4-hour PMP estimates in Hong Kong with the extreme rainfalls recorded in the Southeast China region as well as the world was conducted.

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