Why is Johor seeing an increase in flood evacuees despite improvements elsewhere?

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Johor Experiences Rising Flood Evacuee Numbers Amidst Wider Improvements

The number of flood evacuees in Johor has increased to 3,145 across five districts as of 8 am, a situation attributed to incessant rainfall experienced since the previous night. This contrasts with improvements reported in Kelantan, Terengganu, Pahang, and Perak, where evacuee numbers have generally decreased, allowing some residents to return home. The continuous downpour in Johor has led to rising water levels, necessitating the opening of 38 relief centres to accommodate the displaced population.
Impact of Persistent Rainfall in Johor

Johor recorded a significant rise in flood victims, with Kota Tinggi being the most affected district, housing 1,848 individuals. Johor Bahru followed with 1,057 evacuees, while Kulai and Segamat each reported 94 victims, and Mersing had 52. The persistent and heavy rainfall since last night is the direct cause of this surge, leading to the inundation of several areas. This ongoing precipitation has overwhelmed drainage systems and caused rivers to swell, displacing communities and forcing authorities to establish numerous relief centres.
Road Closures Due to Flooding

The increased floodwaters in Johor have also led to the closure of several key roads, hindering transportation and potentially complicating relief efforts. Notably, Jalan Felda Semenchu (FT1406) is closed to all vehicles. Additionally, roads such as Jalan Kota Tinggi-Mersing (LGM) (FT003), Jalan Kota Tinggi-Kluang (Batu 25) (FT091), and Kampung Lukut Cina-Kampung Batu 4 (Taman Aman) (J175) are inaccessible to light vehicles. Further closures impacting light vehicles include Jalan Tai Hong (Taman Scientex) (J053), Jalan Tai Hong (Orkid) (J053), Jalan Sungai Telor (J090), and Mawai Lama (J172), underscoring the widespread impact of the flooding.
General Context of Rainfall and Flooding

In general, prolonged or intense rainfall can overwhelm natural and artificial drainage systems, leading to a significant rise in water levels. When the rate of rainfall exceeds the capacity of rivers and drains to channel water away, floodwaters begin to accumulate in low-lying areas. This phenomenon is particularly pronounced in regions with saturated soil from previous rainfall, as the ground has less capacity to absorb additional water. Consequently, even if other areas are experiencing receding waters due to decreased rainfall or improved drainage, persistent heavy precipitation in a specific locality like Johor can independently trigger or exacerbate flood conditions, necessitating evacuations and causing infrastructure disruptions.

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Why is Johor seeing an increase in flood evacuees despite improvements elsewhere?

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