1001 Smart Cities
🇧🇷 São Paulo

CGE: São Paulo's rain alerts and street-level flood-point map

🤖 AI-generated summary · ◆ 7 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.

7 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

✎ Corrected 27 Aug 2026 3 sources removed. What changed →

The street-level flood map looks like sensing and is not: traffic agents on the road report each flooded point and grade it passable or not. It records water that has already arrived, and it opens no gate and starts no pump.

Outcome🔄 Ongoing
Evidence🏛️ Officialgrades the sourcing — this entry states no impact figure
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 byCentro de Gerenciamento de Emergências (CGE), Secretaria Municipal de Infraestrutura Urbana e Obras (SIURB), Prefeitura de São Paulo
Scale🏙️ City-wide

Part of 1001 Smart Cities — 1,167 documented projects · 🏙️ 10 more in São Paulo · 💧 Water guide · 🌱 Environment projects

São Paulo's city hall has run the CGE since November 1999, after a flood filled the Anhangabaú tunnel that March. It reads its own automatic weather stations — 33 of them in 2022, three of those outside the municipality — and rain gauges in 32 subprefeituras alongside the state DAEE radar at Salesópolis and the Alto Tietê telemetry, then declares an estado de atenção or the higher estado de alerta zone by zone. The public flood-point map is not sensed — municipal traffic agents on the street report each alagamento and grade it transitável or intransitável, with collection focused on the main roads. An alert pre-positions crews and warns drivers; nothing the CGE publishes describes it opening a gate or starting a pump.

Live 📅 since 1999

🎓 Lesson

A live flood map can look like sensing and not be. São Paulo's alagamento layer is human observation typed in by traffic agents, so its coverage follows the main roads they patrol — and it records water that has already arrived rather than predicting it.

🌱 EnvironmentWaterSafety & securitySensors & IoTTraffic management

Sources

↗ CGE — Quem somos (Prefeitura de São Paulo)Operator page, read in full 2026-08-27. 'foi criado em novembro de 1999, após uma inundação de grande proporção que tomou a região do túnel do Anhangabaú em março do mesmo ano'; the CGE sits in a room in CET's operations centre and passes its readings to Defesa Civil, CET, the fire brigade, the subprefeituras, residents and the press. The page carries no publication or update date, hence date: null. Nothing on it describes the CGE opening a gate, starting a pump or actuating anything.
↗ CGE — Classificação dos alagamentosThe load-bearing source for the entry's spine, read in full 2026-08-27. 'As informações de alagamento disponibilizadas no website do CGE são fornecidas pelos agentes de campo (trânsito) da Prefeitura de São Paulo'; 'essas informações são coletadas com foco nas principais vias da cidade'; transitável and intransitável are defined verbatim. No date on the page.
↗ CGE — Fontes de informaçãoRead in full 2026-08-27. The city's own statement of what it owns and what it consumes: the SAISP radar at Salesópolis is 'Operado pela Fundação Centro Tecnológico de Hidráulica (FCTH)' and 'de propriedade do Departamento de Águas e Energia Elétrica (DAEE)'; the telemetric network is 'Distribuída em aproximadamente 300 pontos da bacia do Alto-Tietê'; the automatic weather stations are the CGE's own. No date on the page.
↗ CGE — MonitoramentoRead in full 2026-08-27. Lists the monitoring inputs, including 'Pluviômetros instalados em 32 subprefeituras', the SAISP radar at Salesópolis as the primary radar, and auxiliary radars. No date on the page.
↗ Prefeitura de São Paulo — "Cidade conta com centro especializado para monitoramento das condições meteorológicas" (19 Dec 2022)City press page, read in full 2026-08-27; the page shows 'Segunda-feira, 19 de Dezembro de 2022 | Horário: 17:30'. Ties the CGE's creation to the Anhangabaú tunnel flood and gives 'as 33 estações meteorológicas automáticas em diversos pontos da cidade, sendo três fora da capital paulista'. Operator figures, not independently audited.
Show 3 more sourcesShow fewer
↗ SAISP — Rede Telemétrica do Alto Tietê (DAEE/FCTH)State system, included to mark the boundary, read in full 2026-08-27. It describes the Alto Tietê telemetry network's own operation — a base station polling remote stations over leased lines and VHF radio 'adotando-se uma varredura a cada 10 minutos' for river and reservoir levels and rainfall. It does not state a station count; the '~300 pontos' figure is the CGE's, on its fontes page. No date on the page.
↗ Agência Brasil — storms put the city of São Paulo on alert (Jan 2026)Published 7 January 2026Read in full 2026-08-27; published 07/01/2026 19:11, by Elaine Patrícia Cruz. Shows the zone-by-zone escalation in use: 'Toda a capital paulista está em estado de atenção para chuvas, com exceção de Aricanduva e Itaquera, na zona leste, que estão em situação mais grave, o estado de alerta', and 'O estado de alerta é o mais alto da escala' of the CGE.
↗ Mapeamento dinâmico e colaborativo de alagamentos na cidade de São Paulo, Boletim de Ciências Geodésicas 19(4), 2013Published 2013Peer-reviewed work that uses the CGE/CET flood-point feed and probes its gaps. Cited for context only: scielo.br returned HTTP 403 to automated fetch and the UFPR PDF mirror returned unparseable binary, so no figure from it is carried in this entry.

📅 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 1999. 3 of 8 sources carry a publication date, from 2013 to 7 January 2026.

When the sources were published

  1. SciELO Brasil · researchMapeamento dinâmico e colaborativo de alagamentos na cidade de São Paulo, Boletim de Ciências Geodésicas 19(4), 2013
  2. Prefeitura de São Paulo · city governmentPrefeitura de São Paulo — "Cidade conta com centro especializado para monitoramento das condições meteorológicas" (19 Dec 2022)
  3. Agência Brasil (Empresa Brasil de Comunicação) · pressAgência Brasil — storms put the city of São Paulo on alert (Jan 2026)

Every source, with links ↑

What happened to this record

  1. 3 sources removed
  2. Entered the record
  3. Sources last read

Every revision, permanent →

Show your work What this page rests on and what it can’t tell you · all 7 claims with their sources · the forensic record

Evidence Passport · public beta 7 addressable claims, 8 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 7

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-a0533687fbc1798f quantitative
São Paulo's city hall has run the CGE since November 1999, after a flood filled the Anhangabaú tunnel that March
Published field
snippet · verbatim
Mapping
mapped · no interpretation or interpolation added by this passport
What the mapping says
'foi criado em novembro de 1999, após uma inundação de grande proporção que tomou a região do túnel do Anhangabaú em março do mesmo ano'; the city press page repeats the founding and the tunnel flood.
Caveat
No claim-specific caveat recorded

Sources carrying this claim

  1. CGE — Quem somos (Prefeitura de São Paulo)
  2. Prefeitura de São Paulo — "Cidade conta com centro especializado para monitoramento das condições meteorológicas" (19 Dec 2022)
Claim 2 clm-88435f31ba81d589 quantitative
It reads its own automatic weather stations — 33 of them in 2022, three of those outside the municipality — and rain gauges in 32 subprefeituras alongside the state DAEE radar at Salesópolis and the Alto Tietê telemetry
Published field
snippet · verbatim
Mapping
mapped · no interpretation or interpolation added by this passport
What the mapping says
The monitoring page lists 'Pluviômetros instalados em 32 subprefeituras' and the Salesópolis radar; the fontes page says the radar is 'de propriedade do Departamento de Águas e Energia Elétrica (DAEE)' and the telemetry is 'Distribuída em aproximadamente 300 pontos da bacia do Alto-Tietê'; the 2022 city page gives 'as 33 estações meteorológicas automáticas… sendo três fora da capital paulista'.
Caveat
No claim-specific caveat recorded

Sources carrying this claim

  1. CGE — Monitoramento
  2. CGE — Fontes de informação
  3. Prefeitura de São Paulo — "Cidade conta com centro especializado para monitoramento das condições meteorológicas" (19 Dec 2022)
  4. SAISP — Rede Telemétrica do Alto Tietê (DAEE/FCTH)
Claim 3 clm-e536d95f161c8e7b descriptive
then declares an estado de atenção or the higher estado de alerta zone by zone
Published field
snippet · verbatim
Mapping
mapped · no interpretation or interpolation added by this passport
What the mapping says
'Toda a capital paulista está em estado de atenção para chuvas, com exceção de Aricanduva e Itaquera… que estão em situação mais grave, o estado de alerta', and the alerta state 'é o mais alto da escala' of the CGE.
Caveat
No claim-specific caveat recorded

Sources carrying this claim

  1. Agência Brasil — storms put the city of São Paulo on alert (Jan 2026)
Claim 4 clm-d18e20077d748892 descriptive
The public flood-point map is not sensed — municipal traffic agents on the street report each alagamento and grade it transitável or intransitável, with collection focused on the main roads
Published field
snippet · verbatim
Mapping
mapped · no interpretation or interpolation added by this passport
What the mapping says
'As informações de alagamento disponibilizadas no website do CGE são fornecidas pelos agentes de campo (trânsito) da Prefeitura de São Paulo'; the page defines transitável and intransitável and states 'essas informações são coletadas com foco nas principais vias da cidade'.
Caveat
No claim-specific caveat recorded

Sources carrying this claim

  1. CGE — Classificação dos alagamentos
Claim 5 clm-029d063c71e03230 descriptive
An alert pre-positions crews and warns drivers; nothing the CGE publishes describes it opening a gate or starting a pump
Published field
snippet · verbatim
Mapping
mapped · no interpretation or interpolation added by this passport
What the mapping says
The operator's own description of the CGE ends at monitoring, transmitting and informing — Defesa Civil, CET, the fire brigade, the subprefeituras, residents and the press. Neither page describes any actuation, and no other listed source supplies one.
Caveat
No claim-specific caveat recorded

Sources carrying this claim

  1. CGE — Quem somos (Prefeitura de São Paulo)
  2. CGE — Monitoramento
Claim 6 clm-8fef74bc932b6630 descriptive
A live flood map can look like sensing and not be
Published field
lesson · verbatim
Mapping
mapped · no interpretation or interpolation added by this passport
What the mapping says
The classification page states the source of the data is field traffic agents, not sensors.
Caveat
No claim-specific caveat recorded

Sources carrying this claim

  1. CGE — Classificação dos alagamentos
Claim 7 clm-b9401fee37d9e47e descriptive
so its coverage follows the main roads they patrol — and it records water that has already arrived rather than predicting it
Published field
lesson · verbatim
Mapping
mapped · no interpretation or interpolation added by this passport
What the mapping says
'essas informações são coletadas com foco nas principais vias da cidade, como o centro expandido, e nos principais corredores de tráfego'; the 2013 peer-reviewed study of the same feed examines its gaps.
Caveat
No claim-specific caveat recorded

Sources carrying this claim

  1. CGE — Classificação dos alagamentos
  2. Mapeamento dinâmico e colaborativo de alagamentos na cidade de São Paulo, Boletim de Ciências Geodésicas 19(4), 2013
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 2026-08-27-correction-run effective 2026-08-27 · created 2026-08-27

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

sha256:664aa0c09754b71b94e72826add7ded0ea2eebbf58d6aeaef5953e36854fdd5a
Revision history → Permanent version link → Machine-readable record → Evidence Constitution →
7
of 7 claims mapped
8
source dossiers
2
publication dates recorded
0
archives linked
0
exact locators
0
content captures hashed

Governance facts carried by the record

Operator
Centro de Gerenciamento de Emergências (CGE), Secretaria Municipal de Infraestrutura Urbana e Obras (SIURB), Prefeitura de São Paulo
Actor types
city-government
Funding model
public
Funding description
Not recorded
Cost
Not recorded
Ownership
Not recorded
Decision rights
Not recorded
Exit conditions
Not recorded

8 source dossiers

CGE — Quem somos (Prefeitura de São Paulo) cgesp.org · 2 linked claims

Open original source ↗

Stable source ID
src-c822dcc25bb9ba5c
Publisher
Name not classified · cgesp.org
Type / language
web-page · language not classified
Published
Not recorded
Updated
Not recorded
Source last checked
No source-level check date
Record last verified
2026-08-27
Dossier created
2026-08-27
Retrieved copy
No local capture recorded
Archive
No archived copy linked
Content hash
No captured content hash
Locator
Open the recorded source note

Operator page, read in full 2026-08-27. 'foi criado em novembro de 1999, após uma inundação de grande proporção que tomou a região do túnel do Anhangabaú em março do mesmo ano'; the CGE sits in a room in CET's operations centre and passes its readings to Defesa Civil, CET, the fire brigade, the subprefeituras, residents and the press. The page carries no publication or update date, hence date: null. Nothing on it describes the CGE opening a gate, starting a pump or actuating anything.

Descriptive only — not page/paragraph exact
Claims linked
CGE — Classificação dos alagamentos cgesp.org · 3 linked claims

Open original source ↗

Stable source ID
src-d8b54cc27b6a5120
Publisher
Name not classified · cgesp.org
Type / language
web-page · language not classified
Published
Not recorded
Updated
Not recorded
Source last checked
No source-level check date
Record last verified
2026-08-27
Dossier created
2026-08-27
Retrieved copy
No local capture recorded
Archive
No archived copy linked
Content hash
No captured content hash
Locator
Open the recorded source note

The load-bearing source for the entry's spine, read in full 2026-08-27. 'As informações de alagamento disponibilizadas no website do CGE são fornecidas pelos agentes de campo (trânsito) da Prefeitura de São Paulo'; 'essas informações são coletadas com foco nas principais vias da cidade'; transitável and intransitável are defined verbatim. No date on the page.

Descriptive only — not page/paragraph exact
Claims linked
CGE — Fontes de informação cgesp.org · 1 linked claim

Open original source ↗

Stable source ID
src-7f45adc4f1469689
Publisher
Name not classified · cgesp.org
Type / language
web-page · language not classified
Published
Not recorded
Updated
Not recorded
Source last checked
No source-level check date
Record last verified
2026-08-27
Dossier created
2026-08-27
Retrieved copy
No local capture recorded
Archive
No archived copy linked
Content hash
No captured content hash
Locator
Open the recorded source note

Read in full 2026-08-27. The city's own statement of what it owns and what it consumes: the SAISP radar at Salesópolis is 'Operado pela Fundação Centro Tecnológico de Hidráulica (FCTH)' and 'de propriedade do Departamento de Águas e Energia Elétrica (DAEE)'; the telemetric network is 'Distribuída em aproximadamente 300 pontos da bacia do Alto-Tietê'; the automatic weather stations are the CGE's own. No date on the page.

Descriptive only — not page/paragraph exact
Claims linked
CGE — Monitoramento cgesp.org · 2 linked claims

Open original source ↗

Stable source ID
src-aa17620d12b558f4
Publisher
Name not classified · cgesp.org
Type / language
web-page · language not classified
Published
Not recorded
Updated
Not recorded
Source last checked
No source-level check date
Record last verified
2026-08-27
Dossier created
2026-08-27
Retrieved copy
No local capture recorded
Archive
No archived copy linked
Content hash
No captured content hash
Locator
Open the recorded source note

Read in full 2026-08-27. Lists the monitoring inputs, including 'Pluviômetros instalados em 32 subprefeituras', the SAISP radar at Salesópolis as the primary radar, and auxiliary radars. No date on the page.

Descriptive only — not page/paragraph exact
Claims linked
Prefeitura de São Paulo — "Cidade conta com centro especializado para monitoramento das condições meteorológicas" (19 Dec 2022) prefeitura.sp.gov.br · 2 linked claims

Open original source ↗

Stable source ID
src-9505e419da34adce
Publisher
Name not classified · prefeitura.sp.gov.br
Type / language
web-page · language not classified
Published
2022-12-19
Updated
Not recorded
Source last checked
No source-level check date
Record last verified
2026-08-27
Dossier created
2026-08-27
Retrieved copy
No local capture recorded
Archive
No archived copy linked
Content hash
No captured content hash
Locator
Open the recorded source note

City press page, read in full 2026-08-27; the page shows 'Segunda-feira, 19 de Dezembro de 2022 | Horário: 17:30'. Ties the CGE's creation to the Anhangabaú tunnel flood and gives 'as 33 estações meteorológicas automáticas em diversos pontos da cidade, sendo três fora da capital paulista'. Operator figures, not independently audited.

Descriptive only — not page/paragraph exact
Claims linked
SAISP — Rede Telemétrica do Alto Tietê (DAEE/FCTH) saisp.br · 1 linked claim

Open original source ↗

Stable source ID
src-a27a485796b873e4
Publisher
Name not classified · saisp.br
Type / language
web-page · language not classified
Published
Not recorded
Updated
Not recorded
Source last checked
No source-level check date
Record last verified
2026-08-27
Dossier created
2026-08-27
Retrieved copy
No local capture recorded
Archive
No archived copy linked
Content hash
No captured content hash
Locator
Open the recorded source note

State system, included to mark the boundary, read in full 2026-08-27. It describes the Alto Tietê telemetry network's own operation — a base station polling remote stations over leased lines and VHF radio 'adotando-se uma varredura a cada 10 minutos' for river and reservoir levels and rainfall. It does not state a station count; the '~300 pontos' figure is the CGE's, on its fontes page. No date on the page.

Descriptive only — not page/paragraph exact
Claims linked
Agência Brasil — storms put the city of São Paulo on alert (Jan 2026) agenciabrasil.ebc.com.br · 1 linked claim

Open original source ↗

Stable source ID
src-084c448ed8fd016d
Publisher
Name not classified · agenciabrasil.ebc.com.br
Type / language
web-page · language not classified
Published
2026-01-07
Updated
Not recorded
Source last checked
No source-level check date
Record last verified
2026-08-27
Dossier created
2026-08-27
Retrieved copy
No local capture recorded
Archive
No archived copy linked
Content hash
No captured content hash
Locator
Open the recorded source note

Read in full 2026-08-27; published 07/01/2026 19:11, by Elaine Patrícia Cruz. Shows the zone-by-zone escalation in use: 'Toda a capital paulista está em estado de atenção para chuvas, com exceção de Aricanduva e Itaquera, na zona leste, que estão em situação mais grave, o estado de alerta', and 'O estado de alerta é o mais alto da escala' of the CGE.

Descriptive only — not page/paragraph exact
Claims linked
Mapeamento dinâmico e colaborativo de alagamentos na cidade de São Paulo, Boletim de Ciências Geodésicas 19(4), 2013 scielo.br · 1 linked claim

Open original source ↗

Stable source ID
src-44427f34a02290ba
Publisher
Name not classified · scielo.br
Type / language
web-page · language not classified
Published
Not recorded
Updated
Not recorded
Source last checked
No source-level check date
Record last verified
2026-08-27
Dossier created
2026-08-27
Retrieved copy
No local capture recorded
Archive
No archived copy linked
Content hash
No captured content hash
Locator
Open the recorded source note

Peer-reviewed work that uses the CGE/CET flood-point feed and probes its gaps. Cited for context only: scielo.br returned HTTP 403 to automated fetch and the UFPR PDF mirror returned unparseable binary, so no figure from it is carried in this entry.

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

🇧🇷 CET traffic control centre and São Paulo's observed congestion index · São Paulo The flood map is typed in by municipal traffic agents — the same field staff whose observations once produced the congestion figure. 🇰🇷 Busan Urban Flood Warning System (Busan Safety ON) · Busan Busan doubted its own instruments at launch; São Paulo has none on the street — agents grade each flood transitável or intransitável. 🇯🇵 Tsunami-Alert Automatic Tide Gate Closure · Osaka Osaka's gates close on the alert itself; São Paulo's alert moves crews and warns drivers, but opens no gate and starts no pump.

Explore the wider context

📟 A Reading Is Not a Decision📖 Automated speed enforcement (speed cameras)📖 Integrated command and control centre (ICCC)📖 Adaptive traffic signals
📎 Cite this project

1001 Smart Cities (2026). “CGE: São Paulo's rain alerts and street-level flood-point map” — São Paulo, Brazil. The Smart City Atlas. https://1001smartcities.org/projects/sao-paulo-cge-flood-alert/ (last verified 2026-08-27). Data: CC BY 4.0.

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

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