Permanent project revision
Revision 2026-08-26-p1-quality-uplift · effective 2026-08-26
Current revision. This is the snapshot used by the live entity page.
Created the first structured Evidence Passport with 10 claims and 7 source dossiers.
sha256:ee6bfd9220eda7586b7bbb657f58d89666476ec8a208e8289589c72932955da6
add /evidencePassport — Added claim-level evidence mapping and source dossiers.add /revisionHistory — Established a permanent, hash-addressed baseline revision.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.
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
clm-893e4bd623b8474f
quantitative
A Delft-FEWS system built for the city in 2021 forecasts street-level flood depth at four-metre resolution
clm-1e12a029649e1b6e
quantitative
a 2024 tie-up with Weathernews adds three-hour rain nowcasts
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
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
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
clm-e61f98d707d5178b
quantitative
staff worked through the night and most of the water had receded by 10am
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
clm-f8c28d66f288cffe
descriptive
Instrumentation buys warning time, not capacity
clm-936ea003c04bc442
descriptive
Bangkok can see a storm three hours out and still cannot pump faster than the rain falls
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.
Awaiting operator and domain-expert review; publication of this revision implies neither.
sha256:ee6bfd9220eda7586b7bbb657f58d89666476ec8a208e8289589c72932955da6
src-66080d864ec2c4c9Primary: 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.
src-05e25928cf02bd10Supports 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.
src-e2e16361bd6769e3Supports 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.
src-943ce184a72cb2c5Supports the two city radars at Nong Khaem and Nong Chok, the Weathernews partnership and the three-hour rainfall forecast horizon.
src-a76677a4b048cb15Supports 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.
src-6414456d33ddb75fCounterweight: 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.
src-600da3956af256c3The city's own account in June 2026 of the upgraded drainage capacity and the number of real-time monitoring points.