SHAH ALAM, Nov 10 — Exceptionally heavy rain, with rainfall reaching 108.5 millimetres (mm) over three hours, has been identified as one of the causes of flooding in Jalan Perepat, Kuala Langat, and Kampung Tengah, Gombak, on Sunday.
The Selangor Department of Irrigation and Drainage (JPS) said the highest rainfall was recorded at the RS Batu 8 station in Kuala Langat, followed by Simpang Tiga station in Kuala Lumpur (93mm), Batu 7 in Sijangkang (85mm) and Gombak Barrage (75.5mm).
It said the heavy rain between 5.30 pm and 8.30 pm overwhelmed internal drainage systems, which were unable to cope with the volume of surface runoff, causing water to overflow into affected areas.
"The flooding in Jalan Perepat, Kuala Langat, was caused by exceptionally heavy rain coinciding with exceptionally high tides, which prevented water from the internal drainage system from flowing into the river.
"The existing drains also lacked the capacity to handle the large volume of runoff during the intense downpour," JPS Selangor said in a statement yesterday.
In Kampung Tengah, Gombak, JPS said the flooding was caused by inadequate internal drainage capacity to accommodate runoff following the exceptionally heavy rain.
In response, JPS is carrying out maintenance on the main drainage system and operating pumps at the Segenting floodgate to reduce flood risks in Jalan Perepat.
Meanwhile, a drainage upgrading project aimed at addressing flooding in Kampung Perepat is now 94 per cent complete.
Another drainage upgrading project in Jalan Perepat, Kampung Telok Panglima Garang (Phase 2), is expected to enter the tender stage in the second quarter of 2028.
In Kampung Tengah, Gombak, maintenance and cleaning works on the drainage system stretching from Taman Harmonis to Jalan Tengah 1 have been completed.
JPS is also planning an internal drainage study covering Kampung Tengah, Kampung Kerdas and Kampung Changkat to determine the need for upgrading works as a long-term solution.
"The state government will also take additional immediate and medium-term measures, if necessary, to reduce flood risks while long-term projects are being completed," the statement said.
The public, particularly residents in flood-prone areas, are advised to remain vigilant and comply with instructions from the authorities.
For enquiries, the public may contact JPS Selangor at 03-5544 7376.
