Observed arrival · 2026-10-21
A floodplain map that shows its assumptions
Tanqu Zhinao is an interactive decision platform for the lower Yellow River floodplain, mapping ecological and rural-development indicators across 313 villages and 18 townships.
- For
- Floodplain planners and township managers
- Worth noticing
- Its flood scenario uses elevation thresholds, not a hydrodynamic model, and explicitly lists connectivity, river slope, and engineering effects it does not account for.
Field notes
The map covers an identified 850.06 km² study area in Yuanyang and Fengqiu, Henan, and offers village and township views. Its scenario controls let users change indicator weights or a water-level threshold and inspect resulting classifications or estimated impacts. The page distinguishes the elevation-threshold inundation exercise from flood forecasting, and notes that it does not test connectivity or account for river slope and flood-control works.
Observed signals
Read the marks
Editorial observations of this landing page, not a rating.
One card from the complete issue