HYDROLOGICAL PATTERN OF PAHANG RIVER BASIN AND THEIR RELATION TO FLOOD HISTORICAL EVENT (Corak Hidrologi Lembangan Sungai Pahang dan Hubungannya dengan Kejadian Banjir Lampau)

Abstract

Pahang River is the main channel to drain off water from the inundated area of Pahang Basin to the SouthChina Sea during wet season which is caused by the northeast monsoon. Most of the inundations of lowerareas of Pahang River Basin were caused by overflowing of the Pahang River. The statistics of rainfalland hydrological factors were calculated in terms of their means for the period from 1980 to 2009. Thehighest water level recorded at Sg. Yap was 45.36m and the lowest was 43.49m, whereas for Temerloh,the highest water level was 26.71m and the lowest was 24.73m. Lubuk Paku had the highest water levelof 15.23m and the lowest was recorded as 12.70m. Besides that, the highest monthly total rainfall at Sg.Yap was 254.01mm and the lowest was 106.67mm. At Temerloh, the highest monthly total rainfall was219.83mm and the lowest was 93.75mm. At Lubuk Paku, the highest monthly total rainfall was324.57mm and the lowest was 79.81mm. The mean discharge of Pahang River (1980-2009) at Sg. Yapwas 845.78m³/s, at Temerloh was 1008.50m³/s and Lubuk Paku was 1184.46m³/s. The water levels whichbeyond the danger level in recent three decades had also been identified.