5.44 m bank 8.91 m overflowing the bank by 3.47 m
Nakhon Nayok has 7 flood reports, none of them with a photo. The newest report, from Prachin.space, was recorded on 7 Oct 2026 13:00 at ซอยสาริกา-นางรอง 16, Mueang Nakhon Nayok District.
5.44 m bank 8.91 m overflowing the bank by 3.47 m
Updated at 13 October 2026 with latest reports:
Nakhon Nayok continued to face lingering flood impacts in four districts, Pak Phli, Mueang, Ban Na, and Ongkharak, with the latest count showing about 53,490 households affected and water levels holding steady rather than rising.
The province was included in the Meteorological Department’s 13 October alert for scattered thunderstorms and isolated heavy rain, keeping flash-flood and overflow risks alive in foothill and lowland communities.
Officials urged residents near waterways to follow local advisories, since even stable floodwater can become hazardous if new rainfall arrives.
The Department of Disaster Prevention and Mitigation (DDPM) reported flooding in all four Nakhon Nayok districts, Pak Phli, Mueang Nakhon Nayok, Ban Na and Ongkharak, across 44 subdistricts and 482 villages.
It counted 53,928 affected households and four deaths, and described water levels as stable in its latest provincial summary. A 9 October road update said flooding affected eight rural-road routes in Ongkharak, Mueang and Ban Na.
Two were impassable to small vehicles: NY.3001, with water 10–50 cm deep, and NY.4009, with about 40 cm. The other six stayed passable with 15–25 cm of water on the road, and drivers were advised to take care. The Department of Rural Roads had installed warning and diversion signs and arranged staff and transport help.
The Thai Meteorological Department's 10 October warning covers 10–13 October, with thunderstorms, gusty winds and isolated heavy to very heavy rain, and accumulated rain could cause flash floods and overflow, especially in low-lying areas and near waterways.
Nakhon Nayok has 7 public flood reports in Krap's records, all river-gauge readings, filed between 14:00 on 6 October and 00:00 on 8 October 2026, Thailand time. None includes a photo, a depth in centimetres or a road status, so the depth and road picture below comes from official and news accounts. One report each names Ban Na and Ongkharak.
Flooding began on 26 September after Khun Dan Prakan Chon Dam, holding more than 100% of its roughly 224 million cubic metres, opened all four spillway gates. The Nakhon Nayok River overtopped its banks in Hin Tang, Sarika and Si Nawa subdistricts [1]. Nakhon Nayok recorded the highest rainfall in the eastern region in the 27 September report, 274 mm [2].
The Department of Disaster Prevention and Mitigation (DDPM) reported 4 districts flooded, 44 subdistricts, 482 villages, 53,928 affected households and 4 deaths at 06:00 on 8 October, with the water steady [3]. The household count was 5,038 on 28 September [4], and the first death figure appeared on 7 October.
Ongkharak is the district still in crisis. On 5 October the road in front of Srinakharinwirot University (SWU) Ongkharak had water over more than 500 m, 45 cm at the deepest point [5], and about 3,200 hectares of flower nurseries had been under water for more than six days [6].
Khun Dan Prakan Chon Dam held 216 million cubic metres, 97% of capacity, on 8 October, with 5.20 million cubic metres released that day [7]. Heavy rain is expected on 10-14 October [8]. A report describes one place at one time, and a district with no report isn't proof of a dry road.
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Nakhon Nayok has 7 public flood reports in Krap's records, filed between 14:00 on 6 October and 00:00 on 8 October 2026, Thailand time. All 7 are river-gauge readings: 5 in Mueang Nakhon Nayok, 1 in Ban Na and 1 in Ongkharak.
None includes a photo, a depth in centimetres or a road status. The readings give the level at a bridge or gauge, not the depth of water on a road, so they can't answer whether a car can pass.
No report records a depth in centimetres, so these figures come from news accounts, mostly in Ongkharak:
PlaceDateWater Depth Rangsit-Nakhon Nayok road in front of SWU Ongkharak, over more than 500 m [5]5 October45 cm at the deepest point Some stretches of the Rangsit-Ongkharak road [9]5 OctoberMore than 50 cm SWU Ongkharak junction, after a DDPM SMS alert [10]4 October, late nightMore than 30 cm Wat Arun Rangsi entrance, Bang Luk Suea [11]7 October, 13:2240-60 cm, and about 20 cm inside the grounds Land-reform community, Village 8, Khlong Yai [12]7 OctoberNearly 1 m in placesAt the Village 8 community, about 1 km off the road, about 50 houses had been flooded for 12 days [12]. On Highway 305 on 30 September, canal water lay about 5 cm deep over about 200 m at km 47+800, where crews were building a barrier and pumping.
No report records a road status, so the road picture comes from official and news accounts. On 28 September small vehicles could not pass some sections of Highway 305, while Highways 2011 and 33 stayed passable [13]. Sheet flooding was reported at Thung Ma Hiu, the Global House area and the Wat Santayaram bypass junction, and several bus routes to Bangkok, Rangsit, Saraburi and Prachin Buri stopped or cut trips [13].
On 3 October the Department of Highways said that points reported as affected in the group of provinces that includes Nakhon Nayok were passable again [14]. Late on 4 October, at the SWU Ongkharak traffic-light junction on Highway 305, DDPM warned that water was more than 30 cm deep and small cars could not pass [10].
On 6 October the Nakhon Nayok Highway District built a detour of about 1 km along the canal road in front of the university so small cars could avoid the flooded stretch, while other vehicles still used the main road [15]. On 7 October the Bang Nam Priao-Ongkharak road (rural road Nor Yor 3001) was covered in every lane by a fast current, with potholes hidden under the water [11].
DDPM lists all four districts as flooded: Pak Phli, Mueang Nakhon Nayok, Ban Na and Ongkharak [3]. On 5 October Ongkharak was graded the crisis area, Ban Na and Pak Phli were still affected and under watch, and Mueang Nakhon Nayok was easing as the water fell.
At 20:00 on 26 September, flooding hit several parts of Mueang Nakhon Nayok, including Highway 3049 in Hin Tang and the Prachakasem junction in Sarika. Water from the dam spillway and forest runoff from the Wang Takhrai and Nang Rong waterfalls and Khlong Maduea had joined. On 27 September the river entered the town municipality and lower Mueang [1].
On 27 September flash flooding entered Chulachomklao Royal Military Academy, and the Armed Forces Academies Preparatory School was surrounded by water [16]. On 28 September more than 300 people were in the Si Nawa subdistrict shelter, and the subdistrict organisation chief said damage was greater than in the major flood of 2011 [17]. By 5 October water in the town had returned to normal.
The province declared Ongkharak an emergency disaster-assistance area on 28 September and asked for water-pusher boats, and the Navy assigned 30 [18]. Ongkharak, a low-lying area that collects water, then became the district where water stayed longest. The governor wrote to the Royal Irrigation Department on 4 October asking it to stop releasing water into the Khlong 14, 15 and 16 canal system [19].
Residents of the roadside homes at the SWU Ongkharak junction removed the sandbag line at about 21:00 on 4 October, saying it was pushing water back into their houses, and officials withdrew from the junction [10]. The bags came off again on 5 October [9]. Water standing for almost 15 days had begun to rot and smell, and a farmer in Village 10 said more than 40 rai of nearly ripe rice was lost [5].
On 6 October the deputy chief of the Khlong Yai subdistrict organisation said all of Khlong Yai was flooded, more than 2,000 households were in hardship, many families were in shelters and nobody had been injured or killed there [15]. Ongkharak Hospital was providing only partial service on 7 October [20]. The prime minister named Ongkharak on 6 October among places with continuing standing water and some cut routes [21].
On 28 September water was spreading into low land, especially Ban Na, Pak Phli and Ongkharak [17]. DDPM also sent a cell broadcast warning to Pikul Ok, Asa, Thong Lang and Bang O subdistricts in Ban Na and Sai Mun in Ongkharak [22].
In Pak Phli, police ran a mobile station at Wat Ko Ka in Tha Ruea subdistrict on 6 and 7 October so that fish farmers with damaged ponds could get police reports for aid and compensation claims.
On 26 September storage exceeded 100% of about 224 million cubic metres, so all four spillway gates were opened for an emergency release [1]. By 28 September storage was nearly 98%, and the spillway opening was raised from about 25 cm to 50 cm at 15:30 [13]. The deputy interior minister's own timeline says the opening was cut from 0.75 m to 0.50 m that day [23].
On 27 September the deputy interior minister asked for a temporary stop to the release [1]. His timeline says the gates were slowed and temporarily closed around 15:30, then reopened before 17:00 at 0.25 m, and he said a full-rate release could flood Ban Na and neighbouring districts for nearly a month [23]. The Royal Irrigation Department's director-general confirmed that the release was slowed that day and reopened after risk information came in [24].
On the morning of 29 September storage was about 219 million cubic metres, about 98%, with spillway release still about 150 cubic metres per second [24]. On 30 September the department closed the spillway and switched to the powerhouse at about 216 million cubic metres, 96%. From 08:30 on 1 October it raised a gate about 25 cm, releasing about 70 cubic metres per second ahead of rain [25].
At 08:00 on 6 October it held 215.79 million cubic metres, 96%, with the gate at 25 cm to draw the reservoir down before heavy rain on 10-14 October [8]. Daily figures from the national water-data table:
DateStorageInflow That DayRelease That Day 5 October [26]214 million m³ (96%)4.64 million m³3.66 million m³ 6 October [27]216 million m³ (96%)5.30 million m³3.77 million m³ 7 October [28]216 million m³ (96%)6.27 million m³6.12 million m³ 8 October [7]216 million m³ (97%)5.75 million m³5.20 million m³On 7 October the dam warned that the raised gate could lift the Nakhon Nayok River downstream [12]. Storage and capacity figures differ slightly between sources, so each is given as published.
DDPM's province line grew from 5,038 households on 28 September to 53,928 by 4 October. The subdistrict and village counts changed too, from 61 subdistricts and 190 villages to 41 and 397 on 30 September, and then 44 and 482. Counts of subdistricts and villages shift between bulletins, so each is given as published.
Date and TimeHouseholdsSubdistricts and VillagesWater 28 September, 06:00 [4]5,03861 and 190Rising 30 September, 06:00 [29]28,02841 and 397Rising 2 October, 06:00 [30]49,01841 and 416Rising 3 October, 06:00 [31]49,01841 and 416Still rising 4 October, 15:11 [32]53,92844 and 482Steady 6 October, 06:00 [33]53,92844 and 482Steady 7 October, 06:00 [34]53,92844 and 482Steady, 4 deaths 8 October, 06:00 [3]53,92844 and 482Steady, 4 deathsThe 7 October report was the first to print a Nakhon Nayok death count, and it gives no cause, date or place for the 4 deaths [34]. No injury or missing-person figure has been published for the province. Local officials in Khlong Yai said nobody there had been hurt.
In the 07:00 water situation of 27 September, Nakhon Nayok had the highest rainfall in the eastern region, 274 mm. The Office of the National Water Resources warned of flash flooding and inundation through 30 September in risk areas, including communities that flood repeatedly [2].
On 3 October the office said the East was falling overall, but the lower area still needed watching, especially Ongkharak [35]. On 4 October it said Ongkharak had a drainage problem, with the Rangsit Tai Operation and Maintenance Project and Bangkok draining together, which would take time [36].
The 24-hour rain totals on 4 October were small: 30.4 mm upstream at Khlong Maduea and 19.4 mm in Khao Yai National Park, with most other points under 5 mm. Heavy rain is expected on 10-14 October [8].
The Nakhon Nayok River runs on through Prachin Buri and the Bang Pakong River to the Gulf of Thailand at Chachoengsao. On 6 October DDPM said part of Nakhon Nayok's water flows through Prachin Buri to the Bang Pakong, and that more effort would go into moving water out of the lower river [37].
On the evening of 6 October a meeting chaired by Deputy Prime Minister Songsak Thongsri agreed a drainage plan along that route, from Khun Dan Prakan Chon Dam to the Gulf. It draws on 130 Navy boats and Irrigation Department pushers nationwide, not a number sent to Nakhon Nayok [38].
On 7 October the Navy moved 10 water-pusher boats from the Nuclear Bridge in Nakhon Nayok to the motorway bridge over the Bang Pakong [39]. The DDPM director-general said pushing water only from the Nakhon Nayok upstream was not very effective, and units were being gathered at the river mouth, 40-50 that day, probably rising to 80 [40].
Downstream, a large mass of water from Ongkharak flowed into Khlong Hok Wa in Bang Nam Priao, Chachoengsao, on 6 October and flooded more than 400 houses there [41]. Residents have also removed sandbags at the Ongkharak-Rangsit boundary twice, where the bags kept Khlong 15 water from flowing into Khlong Rangsit [42]. The prime minister also said on 6 October that he had sent people to look into a clash between Prachin Buri and Nakhon Nayok residents over the removal of a flood dike, and the page doesn't give its location [37].
The governor said on 5 October that flooding had damaged about 3,200 hectares of decorative flower nurseries in three Ongkharak subdistricts, affecting more than 2,000 growers. The nurseries had been under water for more than six days, and growers who expected to harvest flowers for sale the next month lost the crop [6].
In Village 10 of Ongkharak, more than 40 rai of rice was lost [5]. The deputy interior minister named durian orchards as downstream farmland at risk if the dam released at full rate [23]. No rai total for the province has been published.
The Navy sent 30 water-pusher boats to Ongkharak on 28 September, with the first 10 received by the governor that day at the Nuclear Bridge [18]. On 7 October a Privy Councillor handed 1,000 royal relief bags to the governor and the Ongkharak district chief, then gave bags to flood victims at Wat Arun Rangsi [43].
Two companies cooked 2,000 meal boxes at the Makro Nakhon Nayok branch with chefs and supplied relief bags for people in Ongkharak [44]. The Provincial Electricity Authority sent staff into flooded areas of Nakhon Nayok to raise electricity meters, and asked people to report problems on 1129 [45].
On 28 September compensation was waiting for a provincial meeting [17]. No baht amount for Nakhon Nayok has been published.
The Royal Irrigation Department is drawing down Khun Dan Prakan Chon Dam ahead of heavy rain expected on 10-14 October [8]. People downstream were told to follow the situation, because the release could raise the Nakhon Nayok River [12]. Check the Thai Meteorological Department's current warning for your district.
The Krap flood map shows each Nakhon Nayok report as a pin with the place, the time it was filed, and the level at that gauge. Nakhon Nayok has no photo, depth or road-status report at the moment, so check the time on each pin and read the road accounts above.
Route search takes a start and a destination in Thailand and draws the fastest driving road plus up to three alternatives when they exist. It lists reports within about 500 m of the chosen road, and an empty list isn't the same as a clear road.
At 20:00 on 26 September 2026, after the dam opened its spillway and forest runoff joined [1].
Ongkharak, still graded the crisis area on 5 October, with water over parts of Highway 305 on 5 and 6 October [5].
DDPM counted 53,928 households in 4 districts at 06:00 on 8 October 2026 [3].
DDPM reported 4 deaths on 7 and 8 October, with no cause or place given [34].
It depends on the road. At the SWU Ongkharak junction on Highway 305, water was more than 30 cm deep late on 4 October and small cars could not pass [10].
Yes. It released 5.20 million cubic metres on 8 October, with storage at 216 million cubic metres [7].
At 00:00 on 8 October 2026, Thailand time.
No. Krap collects public flood reports and doesn't issue official warnings or dispatch rescue.
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26.96 m bank 29.49 m overflowing the bank by 2.53 m
23.68 m bank 26.49 m overflowing the bank by 2.81 m
6.39 m bank 8.2 m overflowing the bank by 1.81 m
5.33 m bank 8.81 m flow rate 53.2 m³/s · overflowing the bank by 3.48 m