1. Development of intensity-duration-frequency curves for precipitation in western watershed of guwahati (assam)
Authors : Rajarshi Sharma, Rashidul Alam, Visavino Seleyi, Yuvila Sangtam, Navanita Choudhury
Pages : 575-579
Keywords : Intensity-Duration-Frequency (IDF) relationship, design flood, watershed, Guwahati, mass curve, maximum intensity, Gumbel’s frequency analysis technique, regression analysis. Abstract :
The Intensity-Duration-Frequency (IDF) relationship of rainfall amounts is one of the most commonly used tools in water resources engineering for planning, design and operation of water resources project, or for various engineering projects against design floods. The establishment of such relationships was reported as early as in 1932 (Bernard). The objective of this research is to derive IDF relationship of rainfall for western watershed of Guwahati, Assam. These relationships are useful in the design of urban drainage works, e.g. storm sewers, culverts and other hydraulic structures. In the study, rainfall depth for 10 years viz. 2001 to 2010 has been collected from the Regional Meteorological Centre, Borjhar, Guwahati. Firstly, the data has been used to construct the mass curve for duration of more than 7 hours rainfall to calculate the maximum intensity and to form the intensity duration curves. Gumbel’s frequency analysis technique has been used to calculate the probable maximum rainfall intensities for a period of 2 yr, 5 yr, 10 yr, 50 yr, 100yr from the maximum intensity. Finally, regression analysis has been used to develop the intensity-duration-frequency (IDF) curve.Thus, from the analysis the values for the constants ‘a’,‘b’&‘c’ have been found out. The values of ‘a’ for which the sum of the squared deviation is minimum has been found out to be 40 and when the corresponding value of ‘c’ and ‘b’ for the minimum squared deviation are 0.744 and 1981.527 respectively.
Citing this Journal Article :Rajarshi Sharma, Rashidul Alam, Visavino Seleyi, Yuvila Sangtam, Navanita Choudhury, "Development of intensity-duration-frequency curves for precipitation in western watershed of guwahati (assam)", Volume 6 Issue 4 - March 2016, 575-579
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