ANALYSIS OF THE FLASH FLOOD EVENT AND RAINFALL DISTRIBUTION PATTERN ON RELAU RIVER BASIN DEVELOPMENT, PENANG, MALAYSIA

Typical disaster flooding and flash floods in Malaysia. Floods occur especially during the wet season within geographical region area which is influenced by northeast monsoon. So sampling study was conducted March 2019 normal season. Cross-sectional measurements involving measurement of river width, depth velocity were at both times. The main objective this to identify pattern rainfall distribution discharge rate River Basin Relative when flood event occurred. average seasonal value Relau (Upstream) 0.04 m3s-1, (Midstream) 0.57 (Downstream) 0.35 m3s-1. Whereas for Ara 0.78 0.19 m3s-1) Kluang 0.18 estimated shows that total water sewer capacity occurred increase level five meters from with an m3s-1for area. reading 5.18 m3s-1 18.20 While 24.53 25.35 26.22