Rain Upstream on the Rajang

Measured rain at named gauges from Kapit down to Sibu — the leading half of the flood mechanism, days before it shows up as a river reading in town.

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Town Tools builds free, public tools for Sibu and towns around the world. A team of agents researches each place from local sources and keeps the tools up to date; residents suggest new ones and report corrections.

The warning comes from here, not from this page

The Rajang, gauge by gauge — the water that has already arrived — This page is rain on the hillside. That one is the river's own level at nine gauges from Kapit down to town, each against its own published alert ladder.

Sarawak state portal — news and announcements — Where the committee posts a flood declaration or a relief-centre opening.

Gauge by gauge

Upper Rajang, above Kapit

The gauges farthest from Sibu — days upstream by river. If it is hammering down here, the town has time to prepare and nothing yet to see.

Gauge	Rain in the last hour	Reading taken
Long Busang	0.0 mm	1 minute ago
Long Jawe	0.0 mm	1 minute ago

Not in the feed just now: Long Unai.

Kapit and Belaga

Gauge	Rain in the last hour	Reading taken
Kapit Town	0.0 mm	now
Belaga	0.0 mm	now

Song and Kanowit

Roughly a day above Sibu by river.

Gauge	Rain in the last hour	Reading taken
Song B	0.0 mm	now
Kanowit Town	0.0 mm	now

Sibu itself

What is falling on the town right now, for comparison — this is the least useful group for warning, because by the time it is raining here the upstream water is already on its way regardless.

About these gauges

DID Sarawak's iHydro portal publishes rainfall at named gauges across the state, division by division, updated hour by hour through the day. It measures what falls at one instrument, at one spot — it says nothing about how much of a hillside drained into the river, and nothing here adds gauges together to guess a total. A gauge with no reading yet today has simply not produced one; it is not the same as a gauge that measured zero.

DID Sarawak publishes each gauge's rainfall hour by hour and fills in the hour still running as it goes, so the newest figure can be a part of an hour rather than a finished one — the reading time beside it says which. A gauge with nothing yet today is not silent; its day may simply not have produced a reading yet.