Rain storm throughout Saturday’s NSL disruption ‘not unusually excessive’, weatherman says


SINGAPORE — Whereas heavy, the rain storm that fell over elements of Singapore on Saturday (Oct 7) — when prepare providers throughout almost 1 / 4 of the North-South Line (NSL) had been crippled — lasted a “comparatively brief” time and was not unusually excessive by historic requirements, the weatherman stated.

Responding to TODAY’s queries, the Meteorological Service Singapore (MSS) stated Bishan obtained the second-highest rainfall of 42.2mm inside a half-hour interval that day. Queenstown obtained heavier rainfall throughout that interval, with 45.6mm of rainfall.

Nonetheless, by way of day by day complete rainfall, Ang Mo Kio registered the very best rainfall of 74.9mm on Saturday.


(Click on to enlarge) The graph reveals that the very best 24-hour day by day complete rainfall of 74.9mm on 7 October 2017 was recorded in Ang Mo Kio. Supply: Meteorological Service Singapore

“Whereas the rain over some elements of the island on Saturday was heavy, it was of comparatively brief period and the rainfall recorded was not unusually excessive if in comparison with the long-term highest rainfall information for October,” stated a spokesperson for the MSS.

Across the similar interval final yr, rainfall was even larger. On Oct three final yr, for example, 53.4mm of rain fell over Changi in a 30-minute interval, stated the MSS.


(Click on to enlarge) Whereas the rain over some elements of the island on Saturday (7 Oct) was heavy, it was of comparatively brief period and the rainfall recorded was not unusually excessive if in comparison with the long-term highest rainfall information for October. Supply: Meteorological Service Singapore

On Sunday, the Land Transport Authority (LTA) disclosed malfunctioning system of pumps was behind the underground tunnel flooding that started on Saturday night and stopped providers fully alongside six stops on the 26-station NSL.

The malfunctioning water-pumping system allowed water to overflow from the stormwater sump pit, the place rainwater accumulates, into the tunnel by the rail tracks the place trains from Bishan zip underground in direction of Braddell.

As a security precaution, SMRT was pressured to de-activate the trackside energy provide, halting providers between Ang Mo Kio and Newton stations till Sunday afternoon. This thwarted the journeys of hundreds of commuters in one of many worst rail disruptions since 2011.

Engineering consultants who spoke to TODAY stated they had been stunned by the official rationalization of the occasions behind the service disruption.

Nationwide College of Singapore transport researcher Lee Der-Horng stated it was “distinctive” that not one pump however a system of pumps had did not activate, sending water spilling into the tunnel.

“They need to (have a back-up system), in the event that they don’t have one. If they’d one, then that’s much more unacceptable, which suggests the primary (system) and the back-up system all failed,” added Prof Lee.

He known as on the LTA and rail operator SMRT to disclose when the pumps had been final activated, noting that the units couldn’t be occasionally used given how frequent rain storms had been in Singapore.

TODAY has despatched queries to the LTA and SMRT on whether or not a back-up to the water-pumping system was in place, and if its programs had set off warnings earlier than the incident occurred. Each the LTA and SMRT have but to answer the 2 questions, in addition to others on the variety of commuters affected.

The intensive flooding within the tunnel between Bishan and Braddell has additionally raised questions in regards to the extent of harm to the tracks, associated gear in addition to the trains.

Assistant Professor Andrew Ng, a railway signalling, management and communications lecturer with the Singapore Institute of Know-how, stated the digital parts of trackside gear include metallic, which corrodes simply when introduced into contact with water.

It will shorten the lifespan of these parts, together with trackside signalling gear and the bogies of trains — the undercarriage to which a prepare’s wheels are hooked up — affecting performance to a sure extent.

He stated the authorities ought to do one other thorough test to make sure the gear are in “sound” situation. Any parts which were affected considerably must get replaced, and others carefully monitored for such results, he added.

log in

reset password

Back to
log in