Of Nan's 14 districts, 3 have a high estimated chance of river flooding and 0 a high chance of flash flooding. The highest risk is in Mueang Nan, where the river flooding level is High (estimated).
The 2024 observed flood event covers only four northern provinces (Chiang Mai, Chiang Rai, Lamphun, and Phayao); flash-flood terrain indicators are modelled from nationwide terrain data and are not a forecast. OpenStreetMap contributors
| District | Flash-flood terrain susceptibility | Height above nearest drainage (p10) | Distance to nearest stream (p10) | 2024 observed flood area share |
|---|---|---|---|---|
| Phu Phiang | Low | -134.34 m | 1,338.48 m | — |
| Mae Charim | Minimal | 25.38 m | 3,687.35 m | — |
| Tha Wang Pha | Minimal | 22.54 m | 1,959.95 m | — |
| Wiang Sa |
Mueang Nan has the highest Flash-flood terrain susceptibility in Nan, at Moderate.
Mae Charim has the lowest Flash-flood terrain susceptibility in Nan, at Minimal.
Terrain-derived flash-flood indicators (HAND + slope + OSM drainage proximity; NOT a forecast or probability, not calibrated against observed events) from Copernicus DEM GLO-30 (via Mapterhorn terrain tiles) and OpenStreetMap waterway data. The banded metric flags whether the region CONTAINS terrain susceptible to flash flooding somewhere within it -- not the susceptibility of the region as a whole, and not of any individual property. (Copernicus WorldDEM-30 Licence, commercial use permitted (see ./region-elevation.ts's ELEVATION_SOURCE_LICENSE for the full citation) combined with OpenStreetMap contributors: ODbL 1.0 (https://www.openstreetmap.org/copyright)), covering 2010-12-12 – 2015-01-07.
In Nan, 3 districts have a high estimated chance of river flooding and 0 districts have a high estimated chance of flash flooding.
3 districts in Nan have a high estimated chance of river flooding, including Mueang Nan.
The river flooding estimate for Nan's highest-risk district is estimated.
Topographic view shades terrain by elevation — higher, steeper ground is generally less exposed to flooding, while low-lying land near watercourses is more exposed.
3 districts in Nan have a high estimated chance of river flooding, including Mueang Nan.
No districts in Nan currently have a high estimated chance of flash flooding.
Mueang Nan in Nan has the highest single hazard estimate, a High level of river flooding.
Each district gets a Low, Medium, or High estimate for every hazard. "Observed" levels come from a directly measured event, such as a satellite-recorded flood extent. "Estimated" levels are modelled from proxies such as terrain, historical rainfall, or monitoring-station readings, and are not a forecast or a probability. A level never combines more than one hazard, and "Not enough data yet" means exactly that — not a safe rating.
A High estimate for Nan is a prompt to ask more questions — request a site-specific flood or engineering survey, check the property's ground floor level and past flood history with the seller or agent, and review local drainage before committing. A Low estimate does not guarantee a property is risk-free, and none of these levels replace a professional inspection.
| Minimal |
| 39.83 m |
| 5,573.13 m |
| — |
| Thung Chang | Minimal | 9.35 m | 2,442.5 m | — |
|---|
| Chiang Klang | Moderate | 0.5 m | 410.73 m | — |
|---|
| Chaloem Phra Kiat | Low | 59.8 m | 2,284.78 m | — |
|---|
| Na Noi | Low | 69.79 m | 5,269.86 m | — |
|---|
| Pua | Low | 16.32 m | 1,588.89 m | — |
|---|
| Na Muen | Low | 54.37 m | 5,051.93 m | — |
|---|
| Santi Suk | Low | 56.07 m | 2,807.57 m | — |
|---|
| Bo Kluea | Low | 68.8 m | 717.24 m | — |
|---|
| Song Khwae | Low | 37.34 m | 1,704.62 m | — |
|---|
| Mueang Nan | Moderate | 3.38 m | 2,891.84 m | — |
|---|
No districts in Nan currently have a high estimated chance of flash flooding.
The flash flooding estimate for Nan's highest-risk district is estimated.
Mueang Nan in Nan has the highest single hazard estimate, a High level of river flooding.
In areas of Nan with a High hazard estimate, ask for a site-specific survey and the property's flood history before committing — a High estimate is a prompt to investigate further, not a verdict on any single property.
The hazard estimates for Nan are sourced from Terrain-derived flash-flood indicators (HAND + slope + OSM drainage proximity; NOT a forecast or probability, not calibrated against observed events) from Copernicus DEM GLO-30 (via Mapterhorn terrain tiles) and OpenStreetMap waterway data. The banded metric flags whether the region CONTAINS terrain susceptible to flash flooding somewhere within it -- not the susceptibility of the region as a whole, and not of any individual property. (Copernicus WorldDEM-30 Licence, commercial use permitted (see ./region-elevation.ts's ELEVATION_SOURCE_LICENSE for the full citation) combined with OpenStreetMap contributors: ODbL 1.0 (https://www.openstreetmap.org/copyright)).
Low, Medium, and High are screening estimates, not a forecast or probability. Each hazard is scored on its own — there is no single combined risk score across hazards.