Of Chiang Mai's 25 districts, 21 have a high estimated chance of river flooding and 6 a high chance of flash flooding. The highest risk is in Chom Thong, 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
Mueang Chiang Mai has the highest Flash-flood terrain susceptibility in Chiang Mai, at High.
Mae Chaem has the lowest Flash-flood terrain susceptibility in Chiang Mai, 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 Chiang Mai, 21 districts have a high estimated chance of river flooding and 6 districts have a high estimated chance of flash flooding.
21 districts in Chiang Mai have a high estimated chance of river flooding, including Chom Thong.
Topographic view shades terrain by elevation — higher, steeper ground is generally less exposed to flooding, while low-lying land near watercourses is more exposed.
21 districts in Chiang Mai have a high estimated chance of river flooding, including Chom Thong.
6 districts in Chiang Mai have a high estimated chance of flash flooding, including Mueang Chiang Mai.
Chom Thong in Chiang Mai 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 Chiang Mai 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 |
| -25.37 m |
| 344.31 m |
| — |
| San Sai | High | -24.29 m | 164.91 m | — |
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| Doi Tao | Low | -10.87 m | 1,363.47 m | — |
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| Mueang Chiang Mai | High | -6.89 m | 24.06 m | — |
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| Phrao | High | -6.38 m | 147.52 m | — |
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| San Pa Tong | Low | -5.15 m | 282.62 m | — |
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| San Kamphaeng | High | -4.71 m | 167.01 m | — |
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| Mae Rim | High | -3.38 m | 124.45 m | — |
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| Doi Saket | Moderate | -2 m | 191.37 m | — |
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| Hang Dong | High | -1.91 m | 142.75 m | — |
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| Saraphi | Moderate | -1.7 m | 157.82 m | — |
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| Chiang Dao | Moderate | -0.81 m | 186.63 m | — |
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| Mae Chaem | Minimal | 13.4 m | 716.11 m | — |
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| Samoeng | Minimal | 26.5 m | 332.82 m | — |
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| Omkoi | Minimal | 23.17 m | 615.71 m | — |
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| Wiang Haeng | Moderate | 0.01 m | 472.61 m | — |
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| Mae On | Low | 0.15 m | 520.84 m | — |
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| Hot | Low | 1.56 m | 802.06 m | — |
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| Galyani Vadhana | Low | 19.61 m | 766.09 m | — |
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| Chom Thong | Moderate | 1.09 m | 418.58 m | — |
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| Mae Taeng | Moderate | 1.91 m | 251.27 m | — |
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| Chai Prakan | Moderate | 3.22 m | 1,189.19 m | — |
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The river flooding estimate for Chiang Mai's highest-risk district is estimated.
6 districts in Chiang Mai have a high estimated chance of flash flooding, including Mueang Chiang Mai.
The flash flooding estimate for Chiang Mai's highest-risk district is estimated.
Chom Thong in Chiang Mai has the highest single hazard estimate, a High level of river flooding.
In areas of Chiang Mai 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 Chiang Mai 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.