Abstract
There are limitations in using monthly rainfall totals in studies of rainfall climatology as well as in hydrological and agricultural investigations. Variations in rainfall may be considered to result from frequency changes in the daily rainfall of the respective regime. In the present study, daily rainfall data of the stations inside the Koyna catchment has been analysed for the period of 1961–2005 to understand the relationship between the rain and rainy days, mean daily intensity (MDI) and seasonal rainfall over the catchment on monthly as well as seasonal scale. Considering the topographical location of the catchment, analysis of seasonal rainfall data of 8 stations suggests that a linear relationship fits better than the logarithmic relationship in the case of seasonal rainfall versus mean daily intensity. So far as seasonal rainfall versus number of rainy days is considered, the logarithmic relationship is found to be better.
Highlights
The amount of rainfall received over an area or a basin is an important factor in assessing the amount of water available to meet the various demands of agriculture, industry, irrigation, hydroelectric power generation, and other human activities
All the stations have recorded 50% of the rainfall, calculated from the upper end of the normalized rainfall curve (NRC) in 13–16% of rain days with heavy falls while the other 50% is contributed by the 84–87% of rain days with falls of low intensity
To summarize it can be said that the Koyna catchment is the major hydroelectric power supplying station in the Maharashtra, India
Summary
The amount of rainfall received over an area or a basin is an important factor in assessing the amount of water available to meet the various demands of agriculture, industry, irrigation, hydroelectric power generation, and other human activities. Two relatively simple parameters which assist in providing a better picture of rainfall conditions than does the monthly total alone are number of rain days and mean daily rainfall intensity. They give some indication of frequency of occurrence and a crude measure of intensity of rain; both of these characteristics have agricultural and hydrological significance. The Scientific World Journal stations covering wide variety of rainfall regions for the 80year period from 1901 to 1980 They showed that the daily rainfall distribution can be delineated by a normalized rainfall curve (NRC). It is interesting and essential to study the rainfall characteristics of the Koyna catchment from hydro-geological point of view and to understand the impact of climate change after the construction of the dam in 1963 with special reference to rainfall intensity, rainy days, and so forth
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