clm-817ee311c000c4e8
quantitative
Ramani Huria ('open map' in Swahili) trained roughly 470 university students and hundreds of Red Cross volunteers to map flood-prone Dar es Salaam onto OpenStreetMap
Permanent project revision
Ramani Huria Community Flood Mapping
Revision 2026-10-14-baseline · effective 2026-10-14
Current revision. This is the snapshot used by the live entity page.
unreviewed
Created the first structured Evidence Passport with 11 claims and 6 source dossiers.
sha256:64eca56938ef8fcbda4451a29286a22cbd5f13ca62fa581366af79d955d5a6da
Change set
add/evidencePassport— Added claim-level evidence mapping and source dossiers.add/revisionHistory— Established a permanent, hash-addressed baseline revision.
- 11
- of 11 claims mapped
- 6
- source dossiers
- 3
- publication dates recorded
- 0
- archives linked
- 0
- exact locators
- 0
- content captures hashed
Claims, one by one
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-4a161461dfa07ae4
descriptive
using smartphones, drones and street-view surveys
Sources carrying this claim
clm-26a14055113f9fc2
quantitative
By early 2019 it had mapped about 49 of the city's 90 wards and some 450,000 buildings
Sources carrying this claim
clm-3a6998a8a5705b5e
descriptive
the city's multi-agency emergency team DarMAERT still uses the flood atlases in disaster response
Sources carrying this claim
clm-37b2759dd9ed62cc
quantitative
OMDTZ, the local NGO that grew out of the project, said in a September 2025 retrospective that rapid urban growth has left parts of the map outdated
Sources carrying this claim
clm-2f55734a46200b85
descriptive
it keeps updating OpenStreetMap through volunteer mapathons and contract projects such as a World Bank-supported waste-data survey
Sources carrying this claim
clm-d598571f8ab78f80
quantitative
A peer-reviewed 2020 study by researchers at TU Delft and Deltares, with one co-author from the Humanitarian OpenStreetMap Team, found that adding the project's community-mapped drainage data made a neighbourhood flood model match validation data better than a run on terrain data alone
Sources carrying this claim
clm-4d5bff6796fce009
descriptive
at a level of detail it called inaccessible in many data-scarce places
Sources carrying this claim
clm-40857c251a2b49c5
quantitative
In 2025 DarMAERT described using the project's 2018 flood atlas to identify flood-prone areas and guide responders
Sources carrying this claim
clm-0c7df4f917b97d80
descriptive
The lasting value was the open dataset itself: community-generated maps outlived the funded programme and still guide disaster response
Sources carrying this claim
clm-96a51726918e3a36
quantitative
but a map built between 2015 and 2020 ages with a fast-growing city, and keeping it current falls to volunteers and one-off contracts
Sources carrying this claim
Source dossiers and revision state
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 2026-10-14-baseline
effective 2026-10-14 · created 2026-10-14
Awaiting operator and domain-expert review; publication of this revision implies neither.
sha256:64eca56938ef8fcbda4451a29286a22cbd5f13ca62fa581366af79d955d5a6da
- 11
- of 11 claims mapped
- 6
- source dossiers
- 3
- publication dates recorded
- 0
- archives linked
- 0
- exact locators
- 0
- content captures hashed
Governance facts carried by the record
- Operator
- Ramani Huria / Humanitarian OpenStreetMap Team (OMDTZ)
- Actor types
- civil-society
- Funding model
- grant
- Funding description
- World Bank / GFDRR + UK DfID (Tanzania Urban Resilience Programme)
- Cost
- Not recorded
- Ownership
- Not recorded
- Decision rights
- Not recorded
- Exit conditions
- Not recorded
6 source dossiers
Ramani Huria (official project site, OMDTZ)
- Stable source ID
src-a069b57ed1641a5e- Publisher
- Name not classified · ramanihuria.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
- 2026-10-14
- Dossier created
- 2026-10-14
- Retrieved copy
- No local capture recorded
- Archive
- No archived copy linked
- Content hash
- No captured content hash
- Locator
- Descriptive only — not page/paragraph exact
Open the recorded source note
Project description: trains local university students and community members to map Dar es Salaam on OpenStreetMap for flood prevention and response; part of the Tanzania Urban Resilience Programme of DFID and the World Bank, supported by GFDRR and guided by the Humanitarian OpenStreetMap Team.
- Claims linked
Humanitarian OpenStreetMap Team — Urban flood resilience: Ramani Huria
- Stable source ID
src-d4e8868c2d7286c3- Publisher
- Name not classified · hotosm.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
- 2026-10-14
- Dossier created
- 2026-10-14
- Retrieved copy
- No local capture recorded
- Archive
- No archived copy linked
- Content hash
- No captured content hash
- Locator
- Descriptive only — not page/paragraph exact
Open the recorded source note
HOT's project page: phase from April 2015, Ramani Huria 2.0 from 2017 combining exposure and flood-hazard data; smartphone data collection; project news on drone imagery and street-view mapping (2016).
- Claims linked
World Bank — Ramani Huria: the atlas of flood resilience in Dar es Salaam
- Stable source ID
src-7d35b48669aa90e0- Publisher
- Name not classified · documents.worldbank.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
- 2026-10-14
- Dossier created
- 2026-10-14
- Retrieved copy
- No local capture recorded
- Archive
- No archived copy linked
- Content hash
- No captured content hash
- Locator
- Descriptive only — not page/paragraph exact
Open the recorded source note
The project's flood-resilience atlas: detailed local maps of the most flood-prone areas, combined with InaSAFE for disaster scenarios; supported by the World Bank, GFDRR and the Red Cross.
- Claims linked
- Background source; no baseline claim points here
Metropolis — Ramani Huria case study
- Stable source ID
src-190fdabefa80b787- Publisher
- Name not classified · use.metropolis.org
- Type / language
- web-page · language not classified
- Published
- 2019-01-16
- Updated
- Not recorded
- Source last checked
- No source-level check date
- Record last verified
- 2026-10-14
- Dossier created
- 2026-10-14
- Retrieved copy
- No local capture recorded
- Archive
- No archived copy linked
- Content hash
- No captured content hash
- Locator
- Descriptive only — not page/paragraph exact
Open the recorded source note
Case study: since 2015 the project mapped 49 of 90 wards (about half the city), about 450,000 buildings and 1,700 schools; 470 university students trained and more than 300 Red Cross members involved.
- Claims linked
OpenMap Development Tanzania — 'Long-Lasting Impact of Ramani Huria Project' (Sept 2025 retrospective)
- Stable source ID
src-e058a4f398bf2e82- Publisher
- Name not classified · omdtanzania.medium.com
- Type / language
- web-page · language not classified
- Published
- 2025-09-17
- Updated
- Not recorded
- Source last checked
- No source-level check date
- Record last verified
- 2026-10-14
- Dossier created
- 2026-10-14
- Retrieved copy
- No local capture recorded
- Archive
- No archived copy linked
- Content hash
- No captured content hash
- Locator
- Descriptive only — not page/paragraph exact
Open the recorded source note
OMDTZ retrospective: the World Bank-funded project ran 2015–2020; DarMAERT uses the 2018 atlas to support field response; data collected 2015–2020 is outdated in fast-growing areas; OMDTZ updates OpenStreetMap through mapathons, Mapillary imagery and contract projects such as World Bank-supported solid-waste data collection.
Petersson et al., "Community Mapping Supports Comprehensive Urban Flood Modeling for Flood Risk Management in a Data-Scarce Environment", Frontiers in Earth Science
- Stable source ID
src-132d694a23b43f9e- Publisher
- Name not classified · frontiersin.org
- Type / language
- web-page · language not classified
- Published
- 2020-07-21
- Updated
- Not recorded
- Source last checked
- No source-level check date
- Record last verified
- 2026-10-14
- Dossier created
- 2026-10-14
- Retrieved copy
- No local capture recorded
- Archive
- No archived copy linked
- Content hash
- No captured content hash
- Locator
- Descriptive only — not page/paragraph exact
Open the recorded source note
Peer-reviewed study (TU Delft, Deltares, Humanitarian OpenStreetMap Team): Ramani Huria's community-mapped drainage data made a neighbourhood flood model correspond better with validation data than a terrain-only run; flood-extent surveys suit community mapping, drainage dimensions need trained mappers.
- Claims linked
Known limits of this file
- 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.