Permanent project revision
Revision 2026-08-20-source-dates · effective 2026-07-26
Current revision. This is the snapshot used by the live entity page.
Created the first structured Evidence Passport with 1 claim and 8 source dossiers.
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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-d713ca194f484a22
quantitative
An independent evaluation of alerts issued 2010–2013 found the rainfall thresholds kept missed alerts low but generated a large number of false alarms, one zone's threshold probably being set too low
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:d11947de19522a23e6933540744365d4b5fabfbc1e42bdb07a9013f00fa213e0
src-0633ba129b03d684Operator. Created 25 September 1996 by Decree 15142, managed by Fundação GEO-RIO; network of 33 telemetric stations (25 rainfall-only, 5 with temperature/humidity, 2 full weather stations) transmitting every 5 minutes; radars at Sumaré and Mendanha.
src-85d1eb1c50c71c44Currency and mechanism, 21 February 2026: eight sirens sounded in four North Zone communities (Borel, Jamelão, Arrelia, Morro do Andaraí) after a gauge passed 55 mm in one hour, 'characterising the protocol'; all switched off at 20:30 as rain eased. Confirms a human stand-up and stand-down, not automatic actuation.
src-3ca01e401d4a5a3aThe city's own account of a landslide in Rocinha, 27–28 August 2023, with no sirens sounded: 104.6 mm fell in 24 hours against a stated criterion of 150 mm in 24 hours. Note that sources differ on the 24-hour figure — RioOnWatch reports the landslide threshold was cut from 180 mm to 125 mm/24 h after a 1997 study by D'Orsi et al. — so no 24-hour number is asserted in the entry.
src-e77d73f75507b84dPeer-reviewed performance evaluation and the basis of the impact field; co-authored by GEO-RIO's Ricardo d'Orsi, so not fully arm's-length, but published and independently reviewed. ScienceDirect returns 403 to automated fetches; abstract, citation and findings confirmed through two independent search paths including the lead author's publication list.
src-bfaa7f6d1565714eOrigin in the 1996 Tijuca massif landslides (350 mm in 48 hours; 44 dead, 222 houses destroyed); first 30 rain gauges; radar and satellite added 1999; the community alert and alarm system (A2C2) as two levels — SMS to trained community leaders, then sirens; 194 support points and 165 sirens across 103 communities by March 2019; risk mapping not updated since 2013.
src-a68279b4d4b92f17The decision step, quoted: 'a preliminary consultation between Civil Defence and Geo-Rio leadership determines whether risk is sufficient before sounding an actual alarm'; a target of roughly two hours' warning; the 2019 Morro da Babilônia landslide that killed two with sirens not activated; and residents who stay put for fear of losing homes and possessions.
src-1a46a0486119fee6Carries the attributed audit figure: a 2022 Tribunal de Contas do Município report found roughly 400 Rio communities with neither sirens nor geological-geotechnical risk studies, mainly around the Pedra Branca massif in the west zone; and Rio 60ºC coordinator Miguel Vilela stating the system 'was launched in 2011, but they never installed sirens again'. The original agenciabrasil.ebc.com.br page currently serves an electoral-law placeholder to automated fetches, so the text was read through this republication; the TCM audit itself was not opened.
src-ba5d8b27a90982ccPer-station rainfall series are published for download (records go back to 1997) and station metadata is mirrored on the city's data.rio portal. No licence or reuse terms are stated at the download point — downloadable, unlicensed, the same posture as Shanghai and Bangkok in this atlas.