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You are here : eLibrary : IAHR World Congress Proceedings : Managing deltas : Development of idf curve under non-stationary meteorological condition
Development of idf curve under non-stationary meteorological condition
Author : ANKIT P PATEL (1), P. V. TIMBADIYA (2) & P. L. PATEL (3)
ABSTRACT
In the present study, hourly data of rainfall for last 30 years (1983 to 2012) have been used to develop Intensity-Duration-
Frequency (IDF) curve for Ahmedabad, Gujarat, India. To assess the effect of non-stationarity in rainfall record and
development of IDF for study area, the data are sliced into three equal duration of 10 years, viz. 1983-1992, 1993-2002
and 2003-2012. Further, the IDF curves of each sliced duration are also prepared for different return periods. The derived
IDF curves have indicated maximum rainfall intensity, for 5 minute duration and 2-year return period, as 88.83 mm/hr,
103.20 mm/hr and 115.23 mm/hr for 1983-1992, 1993-2002 and 2003-2012 respectively. It is observed that, for all three
sliced IDF curve, the maximum intensity increases with time for various duration and frequency. The non¨Cstationarity in
the rainfall record is clearly observed as maximum rainfall intensity of a given duration has been found to be in increasing
order from IDF curves derived for periods 1983-1992, 1993-2002 and 2003-2012. The analysis presented in the study
concludes that non¨Cstationarity in the meteorological data (rainfall) must be taken into account while deriving the IDF
curves for designing of storm-water drainage system for urban areas.
File Size : 728,916 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : n/a
Article : Managing deltas
Date Published : 20/08/2015
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