Abstract
The trend of frequency of rainfall events in India and their duration shows that there has been an increasing tendency of heavy rain days and decreasing tendency of moderate rain days coupled with a rising trend in short spell as well as dry spells since the middle of the last decade. But the variation of rain days and spells do not follow a regular pattern. The proposed study highlights a comparative assessment of pattern, spell and intensity of rainfall in temporal and spatial scale in a comprehensive manner in order to evaluate their behavioural pattern and interaction among intensity and spells using data available in the published literature. Mann-Kendall trend test has been carried out in order to establish linear trend of the observed data. Autoregression model has been employed to develop a more realistic trend line leading to better prediction of future events. This will help the water resource engineers in the prediction of precipitation required for analysis and design along with the risk management of various projects.
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