CashlessConsumer/chennai-flood-monitor-transactions

UngalSoththu release — an AI-native transit & public-assets desk run on Zo Computer · ungalsoththu.github.io. Not a CashlessConsumer project.

Chennai Flood Monitor DSS — station transactions & registries

One-turn full-history pull of the rainfall / water-level / weather transaction tables behind the TN Government's Chennai Flood Monitoring & Decision Support System (https://chennaifloodmonitor.tn.gov.in), captured 2026-09-29.

The portal publishes these tables only as paged, per-day GeoJSON views (and the UI only shows ~7 days). This dataset pulls every row the WFS endpoint will serve, so the full operational history is preserved in one place.

Source & provenance

Source system	Chennai Flood Monitoring & Decision Support System (CFM-DSS), TNSMART / TN-DMA, powered by IITM Pune
Endpoint	GeoServer WFS GetFeature on chennaifloodmonitor.tn.gov.in/geoserver (layers ChennaiDSS:srg_transaction, ChennaiDSS:awlr_transaction, ChennaiDSS:aws_arg_transaction, ChennaiDSS:arg_transaction)
Capture date	2026-09-29
Row counts	SRG rainfall 662,904 · AWLR water level 385,950 · AWS+ARG rainfall+met 669,147 (server-reported numberMatched, all returned)
License	Not stated by the publisher. Captured and redistributed for research/advocacy under fair dealing; no warranty.

Files

File	Rows	Size	Fields
srg_rain.parquet	662,904	4.5 MB	srgid, rainfall, date, time_of_measurement, par_id
awlr_waterlevel.parquet	385,950	3.7 MB	awlrid, waterlevel, date, time_of_measurement, battery
aws_arg_rain_met.parquet	669,147	7.5 MB	awsid, rainfall, temperature, temp min/max, rh, wind speed/gust, slp/mslp, sunshine, battery, date, time
stations/*.parquet	12 registries	—	station networks incl. proposed/expansion plans (ARG 328, SRG, AWLR existing 44 + proposed 78/139, AWS registry 39, DGPS, gate sensors, IITM networks)

Coverage notes

• Earliest rows reach back to at least 2018; the bulk spans the 2023–2025 northeast monsoons (Michaung: Dec 2023; Oct–Dec 2025 record NEM).
• Rows are as-served by the portal: gaps exist where the station network was down; null rainfall = dry/no-report on some networks.
• Coordinate geometry is not embedded in transaction rows; join station locations via stations/*.parquet (id ↔ lat/lon).

Privacy scrubbing (deliberate)

Station registries in the live API carry staff PII. The following columns were removed before upload; everything else is as-served:

• AWS registry (24 columns dropped): officer-in-charge name + mobile, two SIM numbers + service providers, AMC agency + officer + mobile, maintenance agency contacts.
• ARG registry (9 columns dropped): officer name, two mobiles, two SIMs + providers.
• AWLR type tables (2 columns dropped): officer/agency contact fields.

No personal data of any station staff, contractor, or citizen is present in this dataset.

Related

• CashlessConsumer/chennai-rain-gauges — station registry + our Dec-2023 archive of the predecessor portal (chennaifloodsdss.in, now offline).
• CashlessConsumer/chennai-flood-history — flood extents (2005/2015/2020/2025-era), ward hotspots, crowdsourced reports, alerts.
• CashlessConsumer/chennai-flood-bulletins — the DSS's official PDF bulletins (Oct–Nov 2025 operational run).
• Analysis write-up: UngalSoththu notes, 2026-09-29 (https://cashlessconsumer.zo.space notes; cf. workspace UngalSoththu/notes/2026-09-29-cfmdss-new-system-data-state.md).