Return Period and Rainfall Intensity for Drainage Design in India

摘要

1. Cities have adopted the return periods for design of urban drainage systems based on the 1993 edition of the CPHEEO Manual on Sewerage. 2. According to this manual, the recommended values of flood frequency are: a. For residential areas: i. Peripheral areas: Twice a year (The implication is that we are designing to allow our peripheral areas to flood twice a year!)