本译本为国家能源局委托水电水利规划设计总院按照有关程序和规定，统一组织翻译的能源行业标准英文版系列译本之一。2022年11月4日，国家能源局以2022年第5号公告予以公布。
本译本是根据中国水利水电出版社出版的《水电工程可能最大洪水计算规范》NB/T 10234-2019翻译的，著作权归国家能源局所有。在使用过程中，如出现异议，以中文版为准。

1 General Provisions
2 Terms
3 Basic Data
3.1 Collection and Compilation of Basic Data
3.2 Review and Evaluation of Basic Data
4 Analysis of Storm Flood Characteristics and Storm Causes
4.1 Analysis of Storm Flood Characteristics
4.2 Analysis of Storm Causes
5 Probable Maximum Precipitation
5.1 General Requirements
5.2 Probable Maximum Precipitation Calculation
5.3 Calculation of Probable Maximum Precipitation in Data Shortage Region
5.4 Spatiotemporal Distribution of Probable Maximum Precipitation
6 Probable Maximum Flood
6.1 General Requirements
6.2 Runoff Yield Calculation
6.3 Flow Concentration Calculation
6.4 Watershed Hydrologic Model
6.5 Rationality Check
7 Results Rationality Analysis and Results Determination
Appendix A Climatological Limits of Meteorological Elements
Appendix B T-InP Diagram
Appendix C Precipitable Water Between 1000 hPa Surface and Indicated Pressure in a Saturated Pseudo-Adiabatic Atmosphere as
a Function of the 1000 hPa Dewpoint
Appendix D Contents of Special Report on Probable Maximum Flood Calculation
Explanation of Wording in This Code