The Department of Disaster Prevention and Mitigation (DDPM) counted 16 flooded districts in Phra Nakhon Si Ayutthaya at 06:00 on 8 October 2026: 205 subdistricts, 1,372 villages and 59,928 affected households, with 1 death and the water still rising [1]. A separate provincial total the same day gave 61,365 households in 1,361 villages [2].
The flood began on 22 September, when the Royal Irrigation Department (RID) raised the Chao Phraya Dam release from 1,300 to 1,500 cubic metres per second and the Noi River overtopped its bank in Sena, putting water about 1 m above ground [3]. The release climbed to 2,500 cubic metres per second by 3 October [4], and RID began cutting it to 2,350 on 8 October [5].
Water depths reported from communities run from about 1 m to 3 m. On 26 September the governor visited Bang Ban, Sena and Phra Nakhon Si Ayutthaya districts, where some areas had water about 150 cm deep [6], and residents of Ban Krathum in Sena estimated 2-3 m on 6 October [7].
On 4 October the Chao Phraya stood 1.01 m above its bank at Phra Nakhon Si Ayutthaya and 2.70 m above its bank at Sena [8]. The one death, in Sena, was a drowning [9].
The Pa Sak River is also high. Rama VI Dam was releasing 719 cubic metres per second and rising at 06:00 on 6 October, and the water below it was expected to rise 1.00-1.20 m [10].
A new round of rain is expected on 9-13 October [5]. Household counts differ between agencies and days, so this article gives each figure with its date.
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On 20 September RID warned that the Chao Phraya Dam would need to release 1,000-1,300 cubic metres per second, lifting downstream levels 0.50-1.50 m, especially in low-lying areas outside the dikes in Sena, Phak Hai, Bang Ban, Phra Nakhon Si Ayutthaya, Bang Pa-in and Bang Sai [11]. The earliest dated report of water in homes is from 22 September, when RID raised the release from 1,300 to 1,500 cubic metres per second between 07:00 and 15:00, and a Bang Chani resident in Bang Ban said river water was spilling into homes [12].
A resident in Moo 2 of Ban Krathum, Sena, said the Noi River had crept up for about four days and reached chest height that day [3]. In Tha Din Daeng, Phak Hai, a resident said the water rose nearly 1 m a day, against the usual 10-20 cm [13].
| Date | Chao Phraya Dam Release, Cubic Metres per Second |
|---|---|
| 21 September [14] | Stepped up from 990 toward 1,000-1,300 |
| 22 September [12] | 1,300 to 1,500 |
| 23 September [15] | 1,620 |
| 24 September [16] | 1,750 |
| 25 September [17] | 1,900 |
| 26 September [18] | 1,850 |
| 29 September [19] | 2,000 |
| 30 September [20] | 2,300 |
| 2 October [21] | 2,400 |
| 3 October [4] | 2,500 |
| 8 October [5] | Cut in steps from 2,500 to 2,350 |
Figures differ between sources on some days. On 29 September the province gave 1,950 and RID gave 2,000, and on 30 September one account of an RID announcement said 2,500 [22]. Each is shown here as the cited page gave it.
Depths come from officials and from residents, who estimate by eye. The table separates the two.
| Place | Date | Reported Depth |
|---|---|---|
| Ban Krathum Moo 2, Sena [3] | 22 September | About 1 m above ground, chest height |
| Tha Din Daeng Moo 1, Phak Hai [13] | 24 September | About 1 m |
| Bang Ban, Sena and Phra Nakhon Si Ayutthaya districts, governor's visit [6] | 26 September | About 150 cm in some areas |
| Ban Pho Moo 6, Sena [22] | 30 September | Over 1.70 m |
| Ban Len Moo 1, Bang Pa-in [23] | 2 October | Road over 1 m; about 1.70 m inside the community |
| Sanam Chai Moo 1 and 2, Bang Sai [4] | 3 October | About 1.80 m |
| Ban Pom Moo 9, Phra Nakhon Si Ayutthaya [24] | 5 October | About 1.2-1.5 m |
| Ban Kum, Bang Ban [25] | 5 October | 2-3 m at some points, a resident's estimate |
| Ban Krathum Moo 7, Sena [7] | 6 October | 2-3 m |
| Khanon Luang Moo 4, Bang Pa-in [26] | 6 October | About 1.80 m, 3 m in places |
| Wat Ban Len Sa Krachap, Bang Pa-in [2] | 8 October | Almost 2 m |
Many of these communities can be reached only by boat, and residents in Ban Krathum Moo 7 said the water rose almost 2 m in the first three days [7].
The city mayor said on 28 September that all routes were passable and the historic sites were open [27]. On 4 October the governor said the main routes were unaffected by flooding, with no highway numbers given [8].
Local roads tell a different story. In Ban Len, Bang Pa-in, the road was under more than 1 m of water on 2 October, and vehicles were parked along Highway 3477, the Ayutthaya-Bang Pa-in inner route [23]. On 8 October cars still could not get in or out of the Wat Ban Len Sa Krachap community, whose residents used boats and parked along Highway 3477 [2].
On 6 October water overtopped Highway 3454, Sena-Phak Hai, at several points, and a highways unit built earth dikes to stop it crossing the road [7]. The governor had checked an earth dike at Hua Wiang built to keep the route passable on 5 October [28]. At Wat Prot Sat in Bang Pa-in, soldiers built a wooden bridge at the entrance [26].
The prime minister named Bang Ban on 6 October among districts with continuing standing water and some routes cut, without saying which routes [29]. No kilometre-by-kilometre road list for Ayutthaya has been published.
DDPM lists 16 districts: Sena, Bang Ban, Phak Hai, Phra Nakhon Si Ayutthaya, Bang Pa-in, Bang Pahan, Lat Bua Luang, Uthai, Nakhon Luang, Wang Noi, Tha Ruea, Phachi, Ban Phraek, Maha Rat and two districts both written in English as Bang Sai [1]. The count grew from 6 districts and 5,835 households on 24 September [13].
On 5 October the Bang Ban district chief counted 16 subdistricts, 102 villages, 6,652 households and 15,614 people affected, because most of the district is low land along the Chao Phraya that serves as a water-retention area [30]. In Ban Kum some houses were flooded to the second floor, and families rented rooms elsewhere [25].
In Sena all 9 villages of Ban Phaen subdistrict were flooded, and the province prepared relief bags for 654 households [28]. The Noi River and the Chao Chet-Bang Yi Hon canal overtopped into Moo 6 of Ban Pho [22].
Around the city island, the Chao Phraya and Pa Sak rivers rose and began spilling into the grounds of several temples on 1 October [31]. In Ban Pom, more than 80 households in Moo 9 were affected after water entered on 25 September [24].
Bang Pa-in had 14 subdistricts, 116 villages and 8,817 households affected on 6 October [26]. On 7 October the old Ban Len market had 10-15 cm of standing water, and high tides slowed drainage overnight [9].
On 1 October the Tha Ruea subdistrict deputy mayor said about 2,234 Pa Sak riverside households in Tha Ruea were already flooded [32]. DDPM named Tha Ruea, Nakhon Luang, Phra Nakhon Si Ayutthaya and Bang Pahan districts as watch areas along the Pa Sak [32].
DDPM's provincial counts rose steadily. Disaster and flood-assistance zones were declared in 5 districts by 25 September [17], and the governor said on 5 October that 14 districts had been declared [33]. Counts differ between the national DDPM line and the provincial office, so both are shown.
| Date and Source | Districts | Villages | Households |
|---|---|---|---|
| 24 September, provincial office [13] | 6 | 285 | 5,835 |
| 30 September, provincial office [22] | 13 | 1,081 | 42,286 |
| 2 October, provincial figures [21] | 16 | 1,200 | 48,704 |
| 5 October, 06:00, DDPM [34] | 16 | 1,346 | 53,831 |
| 6 October, 06:00, DDPM [35] | 16 | 1,369 | 56,284 |
| 6 October, provincial office [36] | 16 | 1,338 | 59,633 |
| 7 October, 06:00, DDPM [37] | 16 | 1,371 | 59,633 |
| 8 October, 06:00, DDPM [1] | 16 | 1,372 | 59,928 |
| 8 October, provincial total [2] | 16 | 1,361 | 61,365 |
One death has been reported since 29 September, in Sena, and it was a drowning [9]. No injury or missing-person figure has been published for the province.
On 1 October the highest of 22 overbank points in 7 provinces was Hua Wiang Bridge in Sena, at 126.47% of bank capacity. Ban Bang Luang Dot in Bang Ban stood at 120.2% and Khlong Bang Ban at 117.99% [38].
On 4 October the Chao Phraya at Phra Nakhon Si Ayutthaya district was 5.36 m above mean sea level, 1.01 m above its bank, and at Sena 5.45 m, 2.70 m above its bank [8]. The Office of the National Water Resources (ONWR) said the Chao Phraya and Noi riverbanks could rise about 10 cm that day [39].
On 8 October ONWR said the level above the dam was falling 1-2 cm an hour, and the flow at Bang Sai was still 2,100 cubic metres per second [40].
On 29 September RID said Rama VI Dam was releasing 647.25 cubic metres per second, above the critical 550 level, while Pasak Jolasid Dam held 102.27% of storage [19]. RID planned stepped increases to 700, 750 and 800 cubic metres per second on 1, 2 and 3 October, with the Pa Sak expected to rise 1.00-1.50 m [41].
On 1 October all six gates were open and the release was 531.45 cubic metres per second, with the Raphiphat and Nakhon Luang canals about 100% full [32].
Later figures from different pages disagree: 616 on 3 October [4], and on 4 October 612 from the province [8] against 655 from ONWR [39]. On 6 October RID gave 719 at 06:00 [10], while other pages gave 720 [36] and 675 [26].
At 06:00 on 6 October Pasak Jolasid Dam held 944 million cubic metres, 108%, and released 500 cubic metres per second [10].
Watch areas in Tha Ruea are Tha Ruea, Tha Luang, Champa, Tha Chao Sanuk, Sala Loi, Wang Daeng, Pho En and Pak Tha [10].
The city mayor said on 28 September that historic sites and major temples were open [27], and the governor said on 4 October that tourists could visit attractions as normal [8]. The Fine Arts Department installed a prefabricated bunker wall at Wat Chaiwatthanaram, 1.90 m high and about 165 m long, with 138 panels and automatic pumps [17].
On 26 September the Chao Phraya had overtopped into the outer grounds there, about 30 cm deep in front of the barrier [42]. The city municipality laid a dike along U-Thong Road and installed barriers over 450 m in front of the Queen Suriyothai Chedi [27]. At Wat Choeng Tha the department stacked more than 2,000 sandbags and watched two weak points beside the old wall [31].
On 4 October the province had prepared 197 shelters in 16 districts, of which 9 held 27 households, and listed hotlines 1669 and 1784 [8]. On the city island the Wat Mae Nang Pluem school shelter held 3 households and the Wat Sala Pun school shelter 17 [43].
On 6 October the Wat Khok Hiran school shelter in Bang Ban housed about 180 evacuees, and an armed forces development unit brought a water-purification truck and a mobile toilet truck [44].
On 5 October a listed company handed 2,600 relief bags to the province [33]. The Transport Ministry and its partners delivered more than 3,000 bags, including 700 each to Uthai, Bang Sai, Phra Nakhon Si Ayutthaya and Sena districts [45], and the Red Cross handed 200 relief sets to Bang Ban victims on 7 October [30].
The governor ordered districts to help people record details to claim the 9,000-baht compensation payment, and said the province had asked the government to consider draining water into harvested retention fields [46]. Agencies no longer ask for copies of ID cards or house registration when helping victims, under DDPM guidance [47]. No claimant or payment count for Ayutthaya has been published.
The deputy prime minister said on 26 September that water would be diverted into retention fields in Suphan Buri and Ang Thong because some farmers had begun harvesting [42]. Residents of Ban Kum asked for water to be released into fields that had not yet been opened [25].
The industrial estates at Nakhon Luang, Bang Pa-in and Ban Wa (Hi-Tech) were monitoring water levels around the clock [48]. No page reports water entering an estate.
RID said on 8 October the Chao Phraya basin was improving and that it was cutting the Chao Phraya Dam release in steps, while watching for a new round of rain on 9-13 October [5]. Check the Thai Meteorological Department's current warning for your district.
Water was first reported entering homes on 22 September 2026, after the Chao Phraya Dam release rose to 1,500 cubic metres per second [3].
DDPM counted 59,928 households in 16 districts at 06:00 on 8 October 2026 [1].
One, in Sena, a drowning [9].
The Chao Phraya Dam release was cut to 2,350 cubic metres per second on 8 October, from 2,500 [5].
On 4 October the governor said main routes were passable [8], but local roads in Bang Pa-in and Sena were under water between 2 and 6 October [23] [7].
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