Indicator C3 — Duplicate or Near-Duplicate Projects

AI-verified / Na-verify ng AI Data as of October 21, 2026

Duplicate or Near-Duplicate Projects

Very similar descriptions within ~100m or identical coordinates across contracts/years.

This is a statistical anomaly or indicator worth examining — not proof of wrongdoing, fraud, or corruption against any person.

Indicator: contracts 23OB0403 and 23OB0239 have near-identical descriptions about 144 m apart (funding year 2023; ₱46.73M, ₱46.54M). Worth checking whether they cover the same works. It is possible that these are two segments of a larger drainage project, or that 'RCBC' refers to a specific type of drainage structure within the same barangay.

Public record entityConstruction of Drainage System, Brgy. Tumana, Marikina City

LocationCITY OF MARIKINA (METROPOLITAN MANILA), MARIKINA CITY, National Capital RegionContract 23OB0403

Amount₱46,727,916.11 sumbong source

Only contractors and government agencies named in public procurement records are shown. Private individuals are not named.

Satellite before / after

Esri Wayback · ~0.5 m

Before capture: 2021-02-02 · Maxar

After capture: 2025-04-25 · Vantor

Satellite comparison for public reference — not proof of completion or non-completion.

Imagery may not show small or linear works; no visible change is not evidence of wrongdoing.

Imagery © Esri, Maxar, Earthstar Geographics, and the GIS User Community

Caveats & resolution

Esri World Imagery Wayback (~0.5–1 m); dates are archive release dates, not capture timestamps.
Imagery may not show small or linear works; no visible change is not evidence of wrongdoing.
DPWH coordinates can be approximate; marker shows the imagery center (may be snapped to riverbank/coast).

Disclaimer

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How this was checked

publish · confidence 0.95

Model: gpt-4.1

Prompt: v4.1

Checked: October 22, 2026

The titles are near-identical, both refer to drainage system construction in Barangay Tumana, Marikina City, funded in the same year, by the same contractor, and are only 144 meters apart. The only differences are 'RCBC' in one title and the spelling variant 'Brgy.' vs 'Barangay', which are not distinguishing markers per the rule. There is no phase, package, section, or location marker that would indicate these are distinct works. The evidence is complete and checkable.

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Project completion

Schedule fields from DPWH transparency portal records and the Sumbong sa Pangulo flood-control list — not inferred beyond those columns.

Reported complete (DPWH): 1Ongoing: 0Delayed: 0Status unknown: 0

Project	Prog.	Target end	Actual end	Days late	Status
Construction of Drainage System, Brgy. Tumana, Marikina City23OB0403	100%	December 16, 2023	December 16, 2023	—	completedsumbong source

Start: March 22, 2023 · Source fetched October 21, 2026

Rule Definition

Title similarity + distance or shared coordinates within municipality.

Triggering Data & citations

Similar project description near another contract in the same municipality

{
  "contractId": "23OB0403",
  "coordinates": {
    "lat": 14.662359,
    "lon": 121.09955
  },
  "municipality": "CITY OF MARIKINA (METROPOLITAN MANILA)",
  "distanceMeters": 143.73704852936834,
  "titleSimilarity": 0.9618320610687023
}

Source documents

sumbong — https://raw.githubusercontent.com/rukku/sumbongsapangulo.ph-datasets/main/flood_control_projects.geojsonFetched October 21, 2026