• Pradeep Raja K.P. Research Scholar, Department of Civil Engineering, BMS College of Engineering, Basavanagudi, Bengaluru, Karnataka, India -560019
  • Suresh Ramaswwamy Reddy Professor, Department of Civil Engineering, BMS College of Engineering, Basavanagudi, Bengaluru, Karnataka, India -560019




Mann-Kendall Test, Sen’s Slope Estimator, Bilikere and Halebidu, Trend Analysis, Minor Irrigation Tanks

Abstract [English]

India as a tropical country, depends solely on south west Monsoon. Southwest monsoon spans between June and September. The present study is aimed to carry out the probable trend of rainfall and to evaluate its implications on the tanks in Hunsur taluk of Mysore district, Karnataka, India. These tanks were the livelihood sources of water for the farmers in the command area. The lakes considered under this case study have been completely dried up in the recent past. Inconsistency of rainfall is one of the factors which govern the degradation of Lakes. Trend analysis is carried on 40 years daily rainfall data (1975-2014) for monthly, seasonal and annual average values using Mann-Kendall test and Sen’s slope estimation. The analysis shows ‘no trend’ for the months of January, February, March and June. There is an ‘increasing trend’ for the months of August, October and December. However, there is a ‘decreasing trend’ for the months of April, May, July, September and November. The decadal variation indicates a very significant decrease of rainfall for the months of June and July; particularly in the recent decade (2005-2014) and hence a ‘negative trend’ in the South-West monsoon. This may be one of the reasons for the deterioration of tanks in the study area.


Download data is not yet available.


Ganguly A, Chaudhuri RR, Sharma P. Analysis of Trend of the Precipitation Data : a Case Study of Kangra District , Himachal Pradesh. Int. J. Res. - GRANTHAALAYAH. 2015;3(9):87–95.

Gavrilov MB. Id ő járás. 2016;120(2):183–98.

Hamed KH, Ramachandra Rao A. A modified Mann-Kendall trend test for autocorrelated data. J. Hydrol. 1998;204(1–4):182–96. DOI: https://doi.org/10.1016/S0022-1694(97)00125-X

Jagadeesh P, Anupama C. Statistical and trend analyses of rainfall: A case study of Bharathapuzha river basin, Kerala, India. ISH J. Hydraul. Eng. 2014;20(2):119–32.

Jain SK, Kumar V. Trend analysis of rainfall and temperature data for India. Curr. Sci. [Internet]. 2012;102(1):37–49. Available from: http://www.academia.edu/download/44619413/Jain__2012_-_Trend_analysis_of_rainfall_and_temperature_data_for_India.pdf

Kendall MG (Maurice G. Rank correlation methods. 2nd ed. London: Griffin; 1955.

Kendall MG (Maurice G. Rank correlation methods. 4th ed. London: Griffin; 1975.

Kumar V, Jain SK, Singh Y. Analysis of long-term rainfall trends in India. Hydrol. Sci. J. [Internet]. 2010;55(4):484–96. Available from: DOI: https://doi.org/10.1080/02626667.2010.481373


Laz OU, Rahman A. Trends in Extreme Rainfall Events in Tasmania, Australia. 2014;8(12):824–8.

Mann HB. Nonparametric Tests Against Trend Published by: Econometric Society Stable URL: http://www.jstor.org/stable/1907187 REFERENCES Linked references are available on JSTOR for this article: You may need to log in to JSTOR to access the linked references. 2016;13(3):245–59. Available from: http://www.jstor.org/stable/

Nikhil Raj PP, Azeez PA. Trend analysis of rainfall in Bharathapuzha River basin, Kerala, India. Int. J. Climatol. 2012;32(4):533–9. DOI: https://doi.org/10.1002/joc.2283

Rahman MA, Begum M. Application Of Non Parametric Test For Trend Detection Of Rainfall In The Largest Island Of Bangladesh. J. Earth Sci. 2013;2(2):40–4.

Ramesh K V, P G. The shrinking Indian summer monsoon. CSIR Rep. RR C. [Internet]. 2007; Available from: http://www.cmmacs.ernet.in/cmmacs/Publications/resch_rep/rrcm0709.pdf

Salmi T, Maatta A, Anttila P, Ruoho-Airola T, Amnell T. Detecting Trends of Annual Values of Atmospheric Pollutants by the Mann-Kendall Test and Sen’s Solpe Estimates the Excel Template Application MAKESENS. Finnish Meteorol. Institute, Air Qual. Res. 2002.

Sen KP. Estimates of the Regression Coefficient Based on Kendall’s Tau Author (s): Pranab Kumar Sen Source: Journal of the American Statistical Association, Vol. 63, No. 324 (Dec, 1968), pp. Published by: Taylor & Francis, Ltd. on behalf of the A. 2018;63(324):1379–89. DOI: https://doi.org/10.1080/01621459.1968.10480934

Singh P, Kumar V, Thomas T, Arora M. Basin-wide assessment of temperature trends in northwest and central India. Hydrol. Sci. J. 2008;53(2):421–33.

Sushant S, Balasubramani K, Kumaraswamy K. Environmental Management of River Basin Ecosystems. 2015;21–42. Available from: http://link.springer.com/10.1007/978-3-319-13425-3 DOI: https://doi.org/10.1007/978-3-319-13425-3_2




How to Cite

K.P., P. R., & Reddy, S. R. (2018). RAINFALL TREND ANALYSIS OF A MINI WATERSHED: A CASE STUDY ON DEGRADING LAKES/TANKS. International Journal of Research -GRANTHAALAYAH, 6(7), 28–44. https://doi.org/10.29121/granthaalayah.v6.i7.2018.1281