The peninsular flood events, behind phenomenon of the 2006/2007 Johor flood hazard

Abstract

A study carried out is involving the causes of flood in Johor that was occurred duri. December 2006 to early January 2007, whereas series of heavy storms affected the and southern part of Peninsula Malaysia, only two years after December 2004 bi, Some methods were selected in this study, such as collected, evaluated and a, rainfall data from January 1998 to December 2006, mean annual temperature froi fo 2002. Daily rainfall data from selected rainfall station at Johor was analyz comparedfor their relation between first and the secondflood. This flood hazard O( in two episodes; first episode occurred from 17 to 20 December 2006 and affected Melaka, Pahang and Negeri Sembilan. Second episode covered Johor and S( Pahang from 11 to 14 January 2007. During first flood, the total daily rainfc 1336.6mm for Johor. During the second flood a total four days rainfall if, significantly to 1782mm in Johor. During this hazard, numbers of casualties and e~ were reported; during first flood, 16 people were casualty and 104,023 peopl evacuees. No casualty was recorded during the second flood, but about 109,259 were evacuees all over the affected areas. These extreme precipitation events were associated with northeasterly winds over the South China Sea, eastward prop Madden-Julian Oscillation (MJO) disturbances or due to global climate change. shows that extra ordinary flood was combination between heavy downpour and 10 moderate topography of the study area. Unplanned developments of the town increase of population in Johor are also considered as another contribution to this fl