《水文学手册》（第28号手册）的新版（2012年）包含了自1949年原始手册出版以来在水资源规划、开发和管理领域发生的许多变化和进步。前六章，即第2章至第7章，涉及水文循环中的自然现象，而接下来的三章描述了之前描述的现象的预测和影响。最后一章回顾了水文学的应用，从研究公式开始，然后回顾了数据管理，然后讨论了水文模型的校准和验证，最后总结了评估结果的准确性和可靠性。有了这个新版本，学术和实践水文学家对水文工程领域有了全面和最新的指南。

This new edition (2012) of the Hydrology Handbook (Manual No. 28) incorporates the many changes and advances that have occurred in the areas of planning, development, and management of water resources since the publication of the original manual in 1949.The first six chapters, Chapters 2 through 7, relate to the natural phenomena in the hydrologic cycle, while the next three chapters describe the predictions and effects of the phenomena previously described. The final chapter reviews the applications of hydrology starting with study formulation, then reviews data management, then discusses calibration and verification of hydrologic models, and concludes with accessing accuracy and reliability of results. With this new edition, academic and practicing hydrologists have a thorough and up-to-date guide to the field of hydrologic engineering.