SPATIAL AND TEMPORAL VARIABILITY OF PRECIPITATION CONCENTRATION INDEX (PCI) AND RAINFALL TREND FOR PARAMBIKULAMALIYAR BASIN AREA TAMIL NADU

L. SATHYA¹*, S. SANTHANABOSU^2
1Department of Soil and Water Conservation Engineering, Agricultural Engineering, College and Research Institute, Tiruchirappalli, 621712, Tamil Nadu Agricultural University, Coimbatore, 641003, Tamil Nadu, India
²Department of Soil and Water Conservation Engineering, Agricultural Engineering, College and Research Institute, Tiruchirappalli, 621712, Tamil Nadu Agricultural University, Coimbatore, 641003, Tamil Nadu, India
* Corresponding Author : sathutnau@gmail.com

Received : 19-06-2018     Accepted : 26-06-2018     Published : 30-06-2018
Volume : 10     Issue : 12       Pages : 6451 - 6454
Int J Agr Sci 10.12 (2018):6451-6454

Keywords : Precipitation Concentration Index, Parambikulam Aliyar basin, Monthly distribution, Mann Kendal Analysis
Academic Editor : J Ramachandran
Conflict of Interest : None declared
Acknowledgements/Funding : Author thankful to Agricultural Engineering College and Research Institute, Tiruchirappalli, 621712, Tamil Nadu Agricultural University, Coimbatore, 641003, Tamil Nadu, India
Author Contribution : All author equally contributed

This paper presents the trend in the annual rainfall and its distribution over Parambikulam Aliyar basin of Tamil Nadu determined using 30 years (1988-2008) monthly rainfall data at 28 rain-gauge stations. The trend analysis was done by using Mann-Kendall test. The results indicated increasing trends in annual rainfall. The mean Precipitation Concentration Index of Valaiyar sub basin and Palar sub basin indicates strongly irregular monthly distribution of annual rainfall. The mean Precipitation Concentration Index of Aliyar sub basin and Sholaiyar sub basin indicates irrugular monthly distribution of annual rainfall. The temporal pattern of rainfall trends analyzed in this study is a basic and important requirement for agricultural planning and management of water resources.

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