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The specific query for suggests that a student or professional is looking for a particular formula, table, or diagram. While editions vary slightly, historical data and common syllabi point to a critical subject located around page 266 of the standard edition.

The book "Water Supply Engineering" by BC Punmia is a valuable resource for students, engineers, and professionals in the field of water supply engineering. The book provides a comprehensive overview of the fundamental principles and practices of water supply engineering, making it an essential textbook for undergraduate and postgraduate students. The book is also widely used by practicing engineers and professionals in the field of water resources management.