1001 Smart Cities
🇹🇭 Bangkok

Bangkok Flood Control Centre: Drainage Telemetry & Street-Level Forecasting

🤖 AI-generated summary · ◆ 10 sourced claims · 🔎 Last verified

This overview was generated with AI from the public sources listed below and checked against them before publication. It has not had a complete human fact-check — treat it as a starting point and follow the sources.

10 sourced claims on this page, none individually verified yet — turn on “Sources in the text” to see each one.

How this atlas is made · What “last verified” means · What “source-checked” means · The full record behind this page

Two radars, a rain-gauge network and a four-metre-resolution flood forecast. On 3 November 2025 it measured 131.5 mm falling on a system built for 60, and the roads went under anyway.

Outcome🔄 Ongoing
Evidence🏛️ Official
what does this mean?The strongest source is the operator's or the city's own reporting — an official report, dataset or press release. It grades who did the looking — not how well the project went. All four grades →
Run byBangkok Metropolitan Administration — Department of Drainage and Sewerage
Scale🏙️ City-wide

Part of 1001 Smart Cities — 1,167 documented projects · 🏙️ 9 more in Bangkok · 📡 Sensors & IoT guide · 🌱 Environment projects

Bangkok's drainage department runs two weather radars, a rain-gauge network and canal, river and road level sensors, feeding a flood control centre staffed around the clock and a public site showing water levels and flooded roads. A Delft-FEWS system built for the city in 2021 forecasts street-level flood depth at four-metre resolution, and a 2024 tie-up with Weathernews adds three-hour rain nowcasts. Crews still work the 200 pumping stations, 243 gates and four tunnels themselves; pumping pre-emptively on a forecast is still being studied. On 3 November 2025, 131.5 mm fell in Lak Si against a 60 mm design capacity and the roads went under anyway.

Live 📅 since 2021 🤖 Uses AI

📊 Impact

What the network produced on the night it was tested: on 3 November 2025 it measured 131.5 mm in Lak Si against a system the governor describes as designed for 60 mm an hour, with 116.5 mm at Bang Na and 115.5 mm at Phra Khanong; staff worked through the night and most of the water had receded by 10am. By June 2026 the city put its rainfall drainage capacity at 80 mm an hour and its real-time monitoring at over 300 locations.

🎓 Lesson

Instrumentation buys warning time, not capacity. Bangkok can see a storm three hours out and still cannot pump faster than the rain falls.

🌱 EnvironmentSensors & IoTFlood resilienceWaterArtificial intelligence

Sources

↗ BMA Department of Drainage and Sewerage — Drainage Information Division (Thai)Primary: the division's mandate covers operating Bangkok's weather radar, developing the telemetry measurement equipment and running the flood prevention control centre, establishing the city rather than a national agency as operator.
↗ Bangkok Metropolitan Administration press release, 22 July 2025 (Thai)Supports the counts (4 large tunnels, 200 pumping stations, 243 floodgates, 349 sump wells), 24-hour staffing of pumping stations, coordination centres in all 50 districts, and the three-hour AI rain forecast.
↗ Deltares — FEWS-Bangkok case descriptionSupports the 2021 build year, the city as client, street-level flood depth forecasts at four-metre resolution, and the key governance point: using the pumps proactively ahead of events is described as still being investigated.
↗ MGR Online — the city launches AI Nowcast with Weathernews, 15 March 2024 (Thai)Supports the two city radars at Nong Khaem and Nong Chok, the Weathernews partnership and the three-hour rainfall forecast horizon.
↗ MGR Online — the flood prevention centre's public channels, 6 June 2017 (Thai)Supports the public-facing layer: the city weather site and the drainage department site, plus messaging-app and social alerts every 15 minutes on rain, standing water and traffic.
Show 2 more sourcesShow fewer
↗ The Nation Thailand — rainfall exceeds drainage capacity, 3 November 2025Counterweight: the governor states the system is designed for 60 mm of rain; 131.5 mm fell in Lak Si and Lak Si, Bang Na, Phra Khanong, Khlong Toei and Don Mueang flooded regardless.
↗ The Nation Thailand — Bangkok steps up its flood defences, 1 June 2026The city's own account in June 2026 of the upgraded drainage capacity and the number of real-time monitoring points.

📅 How old is the evidence?

Two clocks, kept apart: when this entry’s sources were published, and what has happened to its record in the atlas. Documented span: since 2021. 5 of 7 sources carry a publication date, from 6 June 2017 to 1 June 2026.

When the sources were published

  1. Manager Online · pressMGR Online — the flood prevention centre's public channels, 6 June 2017 (Thai)
  2. Manager Online · pressMGR Online — the city launches AI Nowcast with Weathernews, 15 March 2024 (Thai)
  3. Bangkok Metropolitan Administration · city governmentBangkok Metropolitan Administration press release, 22 July 2025 (Thai)
  4. The Nation (Thailand) · pressThe Nation Thailand — rainfall exceeds drainage capacity, 3 November 2025
  5. The Nation (Thailand) · pressThe Nation Thailand — Bangkok steps up its flood defences, 1 June 2026

Every source, with links ↑

What happened to this record

  1. Entered the record
  2. Sources last read

Every revision, permanent →

Show your work What this page rests on and what it can’t tell you · all 10 claims with their sources · the forensic record

Evidence Passport · public beta 10 addressable claims, 7 source dossiers, one permanent baseline. The passport is unreviewed — an AI-assisted structural migration, not a human or expert endorsement. Every revision keeps a permanent copy under revision history.

Inspect the claims, one by one — verbatim text, sources and caveats for all 10

The text below is copied verbatim from the published record. Each claim names the source dossiers that carry it; caveats stay attached to the claim they qualify.

Claim 1 clm-25e521ba92688e09 descriptive
Bangkok's drainage department runs two weather radars, a rain-gauge network and canal, river and road level sensors, feeding a flood control centre staffed around the clock and a public site showing water levels and flooded roads
Published field
snippet · verbatim
Mapping
mapped · no interpretation or interpolation added by this passport
What the mapping says
The department's own division page describes the radar, gauge and level-sensor network and the control centre; the 2017 report describes the public channels on which the centre publishes water levels and flooded roads.
Caveat
Both sources are in Thai; no locator string is recorded because the passages are spread across the pages rather than in one sentence.

Sources carrying this claim

  1. BMA Department of Drainage and Sewerage — Drainage Information Division (Thai)
  2. MGR Online — the flood prevention centre's public channels, 6 June 2017 (Thai)
Claim 2 clm-893e4bd623b8474f quantitative
A Delft-FEWS system built for the city in 2021 forecasts street-level flood depth at four-metre resolution
Published field
snippet · verbatim
Mapping
mapped · no interpretation or interpolation added by this passport
What the mapping says
Deltares' own case description of FEWS-Bangkok sets out the forecasting system it built for the city and the resolution at which it produces street-level flood depth.
Caveat
No claim-specific caveat recorded

Sources carrying this claim

  1. Deltares — FEWS-Bangkok case description
Claim 3 clm-1e12a029649e1b6e quantitative
a 2024 tie-up with Weathernews adds three-hour rain nowcasts
Published field
snippet · verbatim
Mapping
mapped · no interpretation or interpolation added by this passport
What the mapping says
MGR Online reported on 15 March 2024 that the city launched an AI nowcast service with Weathernews.
Caveat
No claim-specific caveat recorded

Sources carrying this claim

  1. MGR Online — the city launches AI Nowcast with Weathernews, 15 March 2024 (Thai)
Claim 4 clm-ebd11216b6cb85f0 quantitative
Crews still work the 200 pumping stations, 243 gates and four tunnels themselves; pumping pre-emptively on a forecast is still being studied
Published field
snippet · verbatim
Mapping
mapped · no interpretation or interpolation added by this passport
What the mapping says
The department's own division page lists the pumping stations, gates and tunnels and the crews that operate them; Deltares describes pre-emptive pumping on a forecast as still under study.
Caveat
Drawn from a Thai-language department page and an English case description; no single sentence carries the whole claim, so no locator is recorded.

Sources carrying this claim

  1. BMA Department of Drainage and Sewerage — Drainage Information Division (Thai)
  2. Deltares — FEWS-Bangkok case description
Claim 5 clm-974b2c7c8264cc71 quantitative
On 3 November 2025, 131.5 mm fell in Lak Si against a 60 mm design capacity and the roads went under anyway
Published field
snippet · verbatim
Mapping
mapped · no interpretation or interpolation added by this passport
What the mapping says
The Nation, 3 November 2025: 'peak rainfall measured at 131.5mm in Lak Si district near the Government Complex on Chaeng Watthana Road', and the governor: 'Bangkok's drainage system is designed to handle up to 60mm of rain. Last night, many areas saw more than double that amount, leading to widespread flooding.'
Caveat
No claim-specific caveat recorded

Sources carrying this claim

  1. The Nation Thailand — rainfall exceeds drainage capacity, 3 November 2025
Claim 6 clm-b8ed5e8922655be8 quantitative
on 3 November 2025 it measured 131.5 mm in Lak Si against a system the governor describes as designed for 60 mm an hour, with 116.5 mm at Bang Na and 115.5 mm at Phra Khanong
Published field
impact · verbatim
Mapping
mapped · no interpretation or interpolation added by this passport
What the mapping says
Verbatim: 'peak rainfall measured at 131.5mm in Lak Si district', 'Other high rainfall readings were recorded at Bang Na (116.5mm), Phra Khanong (115.5mm), and Khlong Toei (105.5mm)', and the governor's 'Bangkok's drainage system is designed to handle up to 60mm of rain.'
Caveat
No claim-specific caveat recorded

Sources carrying this claim

  1. The Nation Thailand — rainfall exceeds drainage capacity, 3 November 2025
Claim 7 clm-e61f98d707d5178b quantitative
staff worked through the night and most of the water had receded by 10am
Published field
impact · verbatim
Mapping
mapped · no interpretation or interpolation added by this passport
What the mapping says
The Nation: the governor said city staff worked through the night 'both in front-line and back-office roles', and 'By 10am Monday, most floodwater across Bangkok had receded, though some small lanes remained partially flooded.'
Caveat
No claim-specific caveat recorded

Sources carrying this claim

  1. The Nation Thailand — rainfall exceeds drainage capacity, 3 November 2025
Claim 8 clm-06b75fbebd90a6e0 quantitative
By June 2026 the city put its rainfall drainage capacity at 80 mm an hour and its real-time monitoring at over 300 locations
Published field
impact · verbatim
Mapping
mapped · no interpretation or interpolation added by this passport
What the mapping says
The Nation, 1 June 2026: 'The city has increased its rainfall drainage capacity from 60mm to 80mm per hour, supported by new flood barriers that are higher than the 2011 peak flood levels', and 'Advanced technology, including real-time monitoring at over 300 locations and weather radar for forecasting, is being used to improve response accuracy.'
Caveat
Both figures are the drainage department's own, stated at a Senate committee seminar; no independent evaluation of the forecasting layer was found for this entry.

Sources carrying this claim

  1. The Nation Thailand — Bangkok steps up its flood defences, 1 June 2026
Claim 9 clm-f8c28d66f288cffe descriptive
Instrumentation buys warning time, not capacity
Published field
lesson · verbatim
Mapping
mapped · no interpretation or interpolation added by this passport
What the mapping says
The 3 November 2025 event is the illustration the sources supply: the network measured the rainfall precisely, the governor could state the design limit it exceeded, and the water still went over the roads. The capacity increase the city reports in June 2026 is physical - bigger tunnels, retention systems, higher barriers - not a product of the sensors.
Caveat
No claim-specific caveat recorded

Sources carrying this claim

  1. The Nation Thailand — rainfall exceeds drainage capacity, 3 November 2025
  2. The Nation Thailand — Bangkok steps up its flood defences, 1 June 2026
  3. Deltares — FEWS-Bangkok case description
Claim 10 clm-936ea003c04bc442 descriptive
Bangkok can see a storm three hours out and still cannot pump faster than the rain falls
Published field
lesson · verbatim
Mapping
mapped · no interpretation or interpolation added by this passport
What the mapping says
The three-hour horizon is the nowcast service launched with Weathernews in March 2024; the 3 November 2025 event is the case where the rainfall exceeded the system's stated design capacity regardless.
Caveat
The entry's own reading of the two facts side by side, not a sentence either source writes.

Sources carrying this claim

  1. MGR Online — the city launches AI Nowcast with Weathernews, 15 March 2024 (Thai)
  2. The Nation Thailand — rainfall exceeds drainage capacity, 3 November 2025
Forensic record — source dossiers, gaps, hashes and the exact revision this page renders

This layer records what is known about each source, what is still missing, and the exact snapshot this page is rendering. A missing date, archive or hash stays visible as missing.

unreviewed Revision 2026-08-26-p1-quality-uplift effective 2026-08-26 · created 2026-08-26

Awaiting operator and domain-expert review; publication of this revision implies neither.

sha256:ee6bfd9220eda7586b7bbb657f58d89666476ec8a208e8289589c72932955da6
Revision history → Permanent version link → Machine-readable record → Evidence Constitution →
10
of 10 claims mapped
7
source dossiers
5
publication dates recorded
0
archives linked
0
exact locators
0
content captures hashed

Governance facts carried by the record

Operator
Bangkok Metropolitan Administration — Department of Drainage and Sewerage
Actor types
city-government, utility
Funding model
public
Funding description
Not recorded
Cost
Not recorded
Ownership
Not recorded
Decision rights
Not recorded
Exit conditions
Not recorded

7 source dossiers

BMA Department of Drainage and Sewerage — Drainage Information Division (Thai) dds.bangkok.go.th · 2 linked claims

Open original source ↗

Stable source ID
src-66080d864ec2c4c9
Publisher
Name not classified · dds.bangkok.go.th
Type / language
web-page · language not classified
Published
Not recorded
Updated
Not recorded
Source last checked
No source-level check date
Record last verified
2026-08-26
Dossier created
2026-08-26
Retrieved copy
No local capture recorded
Archive
No archived copy linked
Content hash
No captured content hash
Locator
Open the recorded source note

Primary: the division's mandate covers operating Bangkok's weather radar, developing the telemetry measurement equipment and running the flood prevention control centre, establishing the city rather than a national agency as operator.

Descriptive only — not page/paragraph exact
Claims linked
Bangkok Metropolitan Administration press release, 22 July 2025 (Thai) pr-bangkok.com · background

Open original source ↗

Stable source ID
src-05e25928cf02bd10
Publisher
Name not classified · pr-bangkok.com
Type / language
web-page · language not classified
Published
2025-07-22
Updated
Not recorded
Source last checked
No source-level check date
Record last verified
2026-08-26
Dossier created
2026-08-26
Retrieved copy
No local capture recorded
Archive
No archived copy linked
Content hash
No captured content hash
Locator
Open the recorded source note

Supports the counts (4 large tunnels, 200 pumping stations, 243 floodgates, 349 sump wells), 24-hour staffing of pumping stations, coordination centres in all 50 districts, and the three-hour AI rain forecast.

Descriptive only — not page/paragraph exact
Claims linked
Background source; no baseline claim points here
Deltares — FEWS-Bangkok case description oss.deltares.nl · 3 linked claims

Open original source ↗

Stable source ID
src-e2e16361bd6769e3
Publisher
Name not classified · oss.deltares.nl
Type / language
web-page · language not classified
Published
Not recorded
Updated
Not recorded
Source last checked
No source-level check date
Record last verified
2026-08-26
Dossier created
2026-08-26
Retrieved copy
No local capture recorded
Archive
No archived copy linked
Content hash
No captured content hash
Locator
Open the recorded source note

Supports the 2021 build year, the city as client, street-level flood depth forecasts at four-metre resolution, and the key governance point: using the pumps proactively ahead of events is described as still being investigated.

Descriptive only — not page/paragraph exact
Claims linked
MGR Online — the city launches AI Nowcast with Weathernews, 15 March 2024 (Thai) mgronline.com · 2 linked claims

Open original source ↗

Stable source ID
src-943ce184a72cb2c5
Publisher
Name not classified · mgronline.com
Type / language
web-page · language not classified
Published
2024-03-15
Updated
Not recorded
Source last checked
No source-level check date
Record last verified
2026-08-26
Dossier created
2026-08-26
Retrieved copy
No local capture recorded
Archive
No archived copy linked
Content hash
No captured content hash
Locator
Open the recorded source note

Supports the two city radars at Nong Khaem and Nong Chok, the Weathernews partnership and the three-hour rainfall forecast horizon.

Descriptive only — not page/paragraph exact
Claims linked
MGR Online — the flood prevention centre's public channels, 6 June 2017 (Thai) mgronline.com · 1 linked claim

Open original source ↗

Stable source ID
src-a76677a4b048cb15
Publisher
Name not classified · mgronline.com
Type / language
web-page · language not classified
Published
2017-06-06
Updated
Not recorded
Source last checked
No source-level check date
Record last verified
2026-08-26
Dossier created
2026-08-26
Retrieved copy
No local capture recorded
Archive
No archived copy linked
Content hash
No captured content hash
Locator
Open the recorded source note

Supports the public-facing layer: the city weather site and the drainage department site, plus messaging-app and social alerts every 15 minutes on rain, standing water and traffic.

Descriptive only — not page/paragraph exact
Claims linked
The Nation Thailand — rainfall exceeds drainage capacity, 3 November 2025 nationthailand.com · 5 linked claims

Open original source ↗

Stable source ID
src-6414456d33ddb75f
Publisher
Name not classified · nationthailand.com
Type / language
web-page · language not classified
Published
2025-11-03
Updated
Not recorded
Source last checked
No source-level check date
Record last verified
2026-08-26
Dossier created
2026-08-26
Retrieved copy
No local capture recorded
Archive
No archived copy linked
Content hash
No captured content hash
Locator
Open the recorded source note

Counterweight: the governor states the system is designed for 60 mm of rain; 131.5 mm fell in Lak Si and Lak Si, Bang Na, Phra Khanong, Khlong Toei and Don Mueang flooded regardless.

Descriptive only — not page/paragraph exact
Claims linked
The Nation Thailand — Bangkok steps up its flood defences, 1 June 2026 nationthailand.com · 2 linked claims

Open original source ↗

Stable source ID
src-600da3956af256c3
Publisher
Name not classified · nationthailand.com
Type / language
web-page · language not classified
Published
2026-06-01
Updated
Not recorded
Source last checked
No source-level check date
Record last verified
2026-08-26
Dossier created
2026-08-26
Retrieved copy
No local capture recorded
Archive
No archived copy linked
Content hash
No captured content hash
Locator
Open the recorded source note

The city's own account in June 2026 of the upgraded drainage capacity and the number of real-time monitoring points.

Descriptive only — not page/paragraph exact
Claims linked
Known limits of this passport
  • Publisher names and source languages have not yet been classified; domains are recorded without guessing.
  • Existing source notes are descriptive locators, not page- or paragraph-exact citations.
  • A missing archive, publication date or content hash is shown as null rather than inferred.
  • The project-level evidence grade ranks the strongest source in the entry; it is not a truth score for every claim.

Continue exploring

Compare this project

🇯🇵 Tsunami-Alert Automatic Tide Gate Closure · Osaka Osaka's gates close themselves on an alert; Bangkok forecasts flood depth to four metres and still opens its pumps by hand. 🇰🇷 Busan Urban Flood Warning System (Busan Safety ON) · Busan Busan warns without a barrier at 41 of 57 underpasses; Bangkok warns every 15 minutes and works its 200 pump stations by hand. 🇩🇰 Copenhagen's Cloudburst Management Plan · Copenhagen Copenhagen rebuilt streets to hold the rain; Bangkok measures it instead, and 131.5 mm fell on drains designed for 60.

When the river rises: what is the reading allowed to do?

Four flood systems, four answers to the question that organises much of this atlas — whether a measurement triggers anything. The ladder runs from a reading that acts entirely by itself down to a network that watches everything and decides nothing.

ProjectSinceStatusOutcomeEvidenceRun byCostWhat the reading may do
Tsunami-Alert Automatic Tide Gate ClosureOsaka, 🇯🇵 2018 Live Ongoing Official Regional government not public The reading acts by itself: the tide gates close automatically on the national alert, with no human in the loop.
Bangkok Flood Control Centre: Drainage Telemetry & Street-Level ForecastingBangkok, 🇹🇭 2021 Live Ongoing Official City government, Utility or public operator not public Staff decide with the data: radars and level sensors feed a control centre staffed around the clock, and crews operate the pumps.
Busan Urban Flood Warning System (Busan Safety ON)Busan, 🇰🇷 2023 Live Ongoing Official City government not public Warning only: the portal shows risk and alerts residents, and the city itself cautioned at launch that the readings could be wrong.
SIATA Early Warning NetworkMedellín, 🇨🇴 2010 Live Ongoing Media Research institution not public A research-run regional network that watches everything — including, once, a fatal flash flood in real time that no agency acted on.

Explore the wider context

📟 A Reading Is Not a Decision📖 Adaptive traffic signals📖 District metering area (DMA)📖 Flood early-warning system
📎 Cite this project

1001 Smart Cities (2026). “Bangkok Flood Control Centre: Drainage Telemetry & Street-Level Forecasting” — Bangkok, Thailand. The Smart City Atlas. https://1001smartcities.org/projects/bangkok-drainage-telemetry/ (last verified 2026-08-26). Data: CC BY 4.0.

The underlying data is free to reuse with attribution — see the open data page.

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