A hilltop reservoir in Rayong belonging to the Eastern Water Resources Development and Management Co (EastWater) burst yesterday, causing a flash flood that swept away the belongings and vehicles of about 80 families living downhill.

No casualties were reported.

People living in Nikhom Phattana and Ban Khai districts said they heard a thunderous roar before their communities were hit by 63,000 cubic metres of water that gushed through the wall of the reservoir in Ban Khai.

The torrent of water damaged homes, and swept household belongings and residents' vehicles down the hill.

Some vehicles were found 500 metres from where they were originally parked.

Wannasiri Charoenporn, the mayor of Map Kha municipality, said the 7.7-metre deep reservoir was empty only 20 minutes after the wall gave way, leaving no local tap water.

Laem Prayongcheawchukul, 64, of Ban Khai, said the muddy torrent of water from the reservoir arrived so suddenly that villagers only had time to save themselves and their relatives, but not their belongings or valuables.

Sinual Chaobanmai of Ban Khai said the flash flood nearly killed her children. The water disappeared quickly, but left mud over all her belongings.

Daoloi Sangthong said she only just managed to save her ailing 74-year-old uncle when the floodwater arrived.

EastWater's Rayong operations manager Chalermpol Chuphet said company employees were cleaning sediment from the 23-rai reservoir with water jets when the incident took place.

The strong water jets tore through the rubber seal at the bottom of the reservoir, he said.

Praphant Assava-aree, the president and chief executive officer of EastWater, said the damage caused soil to subside at the base of the reservoir's embankment, allowing water to burst through.

The company would survey the damage and compensate the villagers, he said. A relief centre has also been set up.

Mr Praphant said the incident would not affect production of tap water in Rayong. EastWater's major reservoirs - Nong Pla Lai and Dok Krai - are still in good condition. The two reservoirs, both in Rayong province, have a combined water storage capacity of more than 200 million cu m.

The damaged reservoir had a storage capacity of 10 million cu m.

Suthep Ruenthawil, a Rayong waterworks official, said authorities were distributing fresh water to affected people.

In Chachoengsao province, farmers in Muang district are building flood walls with sandbags along Luang Phaeng canal and other irrigation canals after learning that the Irrigation Department might discharge water from the North through their province into the sea.

Chachoengsao farmers are concerned about reports that water from the Chao Phraya river is being channelled eastward through the Rapipat and Rangsit canals that pass through Chachoengsao province to the sea, to protect Bangkok from flooding.

Farmer Khumthong Srimontha said local paddy fields flooded whenever water from the North was discharged through his province.
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