Tahadhari

Sub-county flood-risk scoring for Nairobi County.
Inputs: CHIRPS rainfall · Copernicus DEM · WorldPop population.

Event date: 6 March 2026 📄 Daily report

Timeline

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Severity

Red — highest 10% of scores

Orange — p75–p90

Yellow — p50–p75

Green — below p50

What-if · simulate rainfall

Override today's rainfall to:

50 mm

Speculative scenario — scores recompute client-side based on the polygon's terrain × pop × drainage × impervious × prior factors.

Map points

Show police, hospitals, fire stations, government offices

Police Fire station Hospital Clinic Government office

Sub-counties ranked by score

Sub-county	Score	Pop at risk

Emergency contacts

Get this report by email

Enter your email and we'll send you the Tahadhari flood-risk update for the selected date. Your address is processed transiently for a single dispatch — not retained beyond a 30-day audit log.

Annotations

Click "pin mode" then click anywhere on the map to drop a note (e.g. "blocked drainage at Mukuru"). Pins persist for all operators.

Compare to 2024 MAM floods

Show 2024 same-week reference

When ON, a smaller side-panel shows the equivalent date in 2024 (Apr–May 2024 MAM event).

Report damage

Incident log

Append-only timeline of operator actions. 📄 brief = internal post-event audit (action log, damage, recommendations). 📰 press = public bilingual EN/SW handout.

Decision-support, not prediction. Severity thresholds are percentile-bucketed across the Feb–Mar 2026 window. This is a v1 indicator combining rainfall × terrain × population — not a hydraulic flood model. For liability framing see the project brief.