They were trapped on top of a 50-metre high hill due to a headwater phenomenon.
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Three friends that went on a hike at the Sungai Gabai waterfall were left stranded following a sudden headwater phenomenon yesterday evening, reported Harian Metro.
According to Selangor Fire and Rescue Department director Norazam Khamis, a team from the Bandar Tun Hussein Onn fire and rescue station was rushed to the location at 5.24pm.
He added that the three hikers, all in their 20s, were trapped on top of a 50 metres high hill due to the phenomenon.
“When the rescue team arrive, the headwater phenomenon had subsided and nobody was injured.
“The rescue team then led all victims down safely,” Norazam was quoted as saying.
The headwater phenomenon
The headwater phenomenon refers to the sudden and rapid rise in water volume and velocity in the upper part of a river, which commonly happens during a downpour.
Most rivers in the country are at high risk of encountering this phenomenon, said National Hydraulic Research Institute of Malaysia (Nahrim) director-general Datuk Dr Md Nasir Md Noh as reported by The Star
Reports of hikers being trapped in a river due to the headwater phenomenon were a regular occurrence in Hulu Selangor.
In September last year, two separate incidents were recorded in a matter of days.
On 17 September 2021, seven men were trapped in Sungai Kedondong in Batang Kali while in a similar incident two days later, a man was trapped across a river near Jalan Batang Kali-Genting for nearly 20 minutes.
However, all of the victims were rescued by the Selangor Fire and Rescue Department.