Of Surat Thani's 19 districts, 14 have a high estimated chance of river flooding and 1 a high chance of flash flooding. The highest risk is in Wiang Sa, 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 |
|---|---|---|---|---|
| Chaiya | Low | -35.66 m | 1,904.04 m | — |
| Ko Pha-Ngan | Moderate | -28.2 m | 279.18 m | — |
| Ban Ta Khun | Low | -8.27 m | 1,899.68 m | — |
| Ban Na Doem |
Ban Na San has the highest Flash-flood terrain susceptibility in Surat Thani, at High.
Tha Chang has the lowest Flash-flood terrain susceptibility in Surat Thani, 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 Surat Thani, 14 districts have a high estimated chance of river flooding and 1 districts have a high estimated chance of flash flooding.
14 districts in Surat Thani have a high estimated chance of river flooding, including Wiang Sa.
Topographic view shades terrain by elevation — higher, steeper ground is generally less exposed to flooding, while low-lying land near watercourses is more exposed.
14 districts in Surat Thani have a high estimated chance of river flooding, including Wiang Sa.
1 districts in Surat Thani have a high estimated chance of flash flooding, including Ban Na San.
Wiang Sa in Surat Thani 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 Surat Thani 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.
| Moderate |
| -6.61 m |
| 208.87 m |
| — |
| Kanchanadit | Low | -2.82 m | 958.54 m | — |
|---|
| Mueang Surat Thani | Moderate | -2.21 m | 189.18 m | — |
|---|
| Don Sak | Low | -2.04 m | 799.64 m | — |
|---|
| Chai Buri | Low | -1.7 m | 408.23 m | — |
|---|
| Wiang Sa | Moderate | -1.62 m | 205.52 m | — |
|---|
| Ko Samui | Moderate | -1.1 m | 577.1 m | — |
|---|
| Phrasaeng | Low | -0.69 m | 1,131.17 m | — |
|---|
| Ban Na San | High | -0.59 m | 68.84 m | — |
|---|
| Phunphin | Low | -0.11 m | 1,722.69 m | — |
|---|
| Tha Chang | Minimal | 5.87 m | 5,318.55 m | — |
|---|
| Phanom | Minimal | 17.39 m | 1,925.66 m | — |
|---|
| Khian Sa | Minimal | 11.22 m | 2,750.37 m | — |
|---|
| Tha Chana | Low | 3.16 m | 7,092.71 m | — |
|---|
| Khiri Rat Nikhom | Low | 7.03 m | 581.14 m | — |
|---|
| Vibhavadi | Low | 17.47 m | 2,891.82 m | — |
|---|
The river flooding estimate for Surat Thani's highest-risk district is estimated.
1 districts in Surat Thani have a high estimated chance of flash flooding, including Ban Na San.
The flash flooding estimate for Surat Thani's highest-risk district is estimated.
Wiang Sa in Surat Thani has the highest single hazard estimate, a High level of river flooding.
In areas of Surat Thani 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 Surat Thani 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.