TITLE:
Development of Rainfall Intensity Duration Frequency Curves for Mumbai City, India
AUTHORS:
P. E. Zope, Eldho T. I., V. Jothiprakash
KEYWORDS:
Rainfall, Intensity, Duration, Return Period, Frequency, IDF Curves
JOURNAL NAME:
Journal of Water Resource and Protection,
Vol.8 No.7,
June
24,
2016
ABSTRACT: The
change in rainfall pattern and intensity is becoming a great concern for
hydrologic engineers and planners. Many parts of the world are experiencing
extreme rainfall events such as experienced on 26th July 2005 in
Mumbai, India. For the appropriate design and planning of urban drainage system
in an area, Intensity Duration Frequency (IDF) curves for given rainfall
conditions are required. The aim of the present study is to derive the IDF
curves for the rainfall in the Mumbai city, Maharashtra, India. Observed
rainfall data from 1901 pertaining to Colaba and from 1951 of the Santacruz
rain gauge stations in Mumbai are used in the present study to derive the IDF
curves. Initially, the proposed IDF curves are derived using an empirical
equation (Kothyari and Garde), by using probability distribution for annual
maximum rainfall and then IDF curves are derived by modifying the equation. IDF
curves developed by the modified equation gives good results in the changing
hydrologic conditions and are compatible even with the extreme rainfall of 26th July 2005 in Mumbai.