Extreme Rainfall Indices for Tropical Monsoon Countries in Southeast Asia


  • Kusumastuti, C. Department of Civil Engineering, Petra Christian University, Surabaya
  • Weesakul, S. Water Engineering and Management Program, School of Engi-neering and Technology, Asian Institute of Technology, Bangkok




Climate variation, extreme rainfall, Mann-Kendall test, rainfall pattern


Southeast Asian countries have the possibility to have rainfall and number of extreme rainfall event change due to future climate variation. This paper proposed three extreme rainfall indices as a modification of climate extremes indices from CLIMDEX Project by researchers at the Climate Change Research Centre (CCRC), the University of New South Wales (UNSW). The proposed indices aim to be used as a parameter for observing extreme rainfall events in tropical monsoon countries. Eleven extreme precipitation indices from CLIMDEX Project and the three proposed extreme precipitation for tropical monsoon countries are systematically analyzed based on data of daily rainfall from meteorological stations in Bangkok and Jakarta. Mann-Kendall test was used to observe the trend of extreme rainfall. In general, the analysis of a total of 14 extreme indices show both Bangkok and Jakarta received more rainfall during rainy season and less rainfall during dry season. Specifically, a significant increasing trend of extreme rainfall indices (R60 and R80) was revealed using the proposed indices.


IPCC, Climate Change 2007: The Physiscal Science Basis. Contribution of Working Group II to The Fourth Assessment Report on The Inter­governmental Panel on Climate Change Cam­bridge University Press, UK, 2007.

Zhang, X., Vincent, L.A., Hogg, W.D., and Niitso, A., Temperature and Precipitation Trends in Canada during the 20th Century, Atmosphere Ocean, 38(3), 2000, pp. 395–429. Retrieved on July 21, 2008 from: http://www.cmos.ca/Ao/articles/ v380301.pdf., 2000, pp. 395–429.

Manton, M.J., Della-Marta, P.M., Haylock, M.R., Hennessy, K.J., Nicholls, N., Chambers, L.E., et al., Trends in Extreme Daily Rainfall and Temperature in Southeast Asia and The South Pacific: 1961–1998, International Journal of Climatology, 2008. Retrieved on July 30, 2008 from: http://www.cig.ensmp.fr/~iahs/hsj/420/hysj_ 42_03_0301.pdf.

Shantha, W.W.A. and Jayasundra, J.M.S.B, Study on Changes of Rainfall in the Mahaweli Uppers Watershed in Sri Lanka, due to Climate Change and Develop a Correlation Model for Global Warming. Retrieved on May 5, 2008 from:http://www.stabilization2005.com/posters/Shantha_WWA.pdf.

CLIMDEX Project, CLIMDEX: Climate Extreme Indices. Retrieved on August 10, 2014 from: http://www.climdex.org/indices.html, 2014.

World Climate, Average Monthly Rainfall in Bangkok, 2008,Retrieved on July 30, 2008, from: http://www.worldclimate.com/cgi-bin/data.pl?ref= N13E100+2100+48455W.

World Climate, Average Monthly Rainfall in Jakarta, 2008,Retrieved on July 30, 2008 from: Source: http://www.worldclimate.com/cgi-bin/data. pl?ref=S06E106+2100+96745W.

Helsel, D.R. and Hirsch, R.M. Book 4: Hydro­logical Analysis and Interpretation (Chapter A3, Statistical Methods in Water Resources). USGS, USA, 1991.

U.S. Army Corps of Engineers, Appendix D-Mann Kendall Analysis. Hydrogeologic, Inc.-OU-1 Annual Groundwater Monitoring Report-For­mer Ford Ord, California, 2005.




How to Cite

C., K., & S., W. (2014). Extreme Rainfall Indices for Tropical Monsoon Countries in Southeast Asia. Civil Engineering Dimension, 16(2), 112-116. https://doi.org/10.9744/ced.16.2.112-116