Development of Non-Stationary Rainfall Intensity-Duration-Frequency Curves for Calabar, Nigeria

Rainfall Intensity-Duration-Frequency (IDF) relationships are crucial in the design and management of hydraulic structures. At the core of the assumption for IDF development is that, the statistics of past rainfall events will represent future rainfall events. It has been proven that climate change is a major trigger for this non-stationarity therefore, the assumption is untenable. This work is aimed at considering the impact of climate change in the development of IDF curves for a city. To account for this non-stationarity, an RCM was combined with measured data through a climate factor (CF) to develop a rainfall IDF for the coastal city of Calabar. The baseline and future climatic periods of the RCM were 1971-2010 and 2021-2060 respectively. The Annual Maxima Series (AMS) were disaggregated and fitted to Gumbel distribution. Results revealed that, the magnitude of trend for measured AMS and measured annual rainfall are -0.351 and +3.628 respectively. A CF value of 0.86 was obtained and a generalized non-stationary rainfall IDF model was derived. When compared to models from similar studies, this model has conserved values with r²=1 and an error margin of ±6% for all return periods. This will introduce economy in the design of hydraulic structures. Excess runoffs in Calabar were therefore related to frequent short duration rainfall with low intensities.