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The Lynmouth Flood occurred on the night of 15–16 August 1952, principally affecting the village of Lynmouth, in North Devon. A storm with heavy rainfall, combined with already saturated soil and flood debris, led to the flooding of the village and a total loss of 34 lives.
The River Lyn through the town had been to gain land for business premises; this culvert soon choked with flood debris, and the river flowed through the town. Much of the debris was boulders and trees.
Overnight, more than 100 buildings were destroyed or seriously damaged along with 28 of the 31 bridges, and 38 cars were washed out to sea. In total, 34 people died, with a further 420 made homeless. The seawall and Rhenish Tower survived the main flood, but were seriously undermined. The tower collapsed into the river the next day, causing a temporary flood.
At the same time, the River Bray at Filleigh also flooded, costing the lives of three Boy Scout from Manchester who had been camping alongside the river overnight.
Over 50,000 tons of rock were moved by water during the disaster. Large rocks and boulders washed downstream can still be found today, alongside Blockfield deposits in nearby locations such as the valleys of Watersmeet.
Similar floods had been recorded at Lynmouth in 1607 and 1796. After the 1952 disaster, Lynmouth village was rebuilt, including diverting the river around the village. The small group of houses on the bank of the East Lyn River called Middleham between Lynmouth and Watersmeet House was destroyed and never rebuilt. Today, there stands a memorial garden.
On 16 August 2004 - exactly 52 years to the day of the Lynmouth Flood - a similar incident happened in Cornwall, when flash floods caused extensive damage to Boscastle, but without loss of life. The hydrological setting of these two villages is very similar.
The theory was fuelled by a 2001 BBC Radio 4 documentary, which suggested that the events of 1952 were connected to Project Cumulus. The programme alleged that "the infamous Lynmouth flood disaster came only days after RAF rain-making experiments over southern England", and that secret experiments were causing heavy rainfall. According to the programme, "classified documents on the trials that Project Cumulus contributed to the conditions that caused this flood have gone missing". A few days before the disaster a seeding experiment was carried out over southern England. Alan Yates, an aeronautical engineer and glider pilot who was working with the operation, sprayed salt in the air and was "elated" to learn of a heavy rainfall in Staines shortly after.
"Survivors tell how the air smelled of sulphur on the afternoon of the floods, and the rain fell so hard it hurt people's faces."
Meteorologist Philip Eden has said the experiments could not have caused the accident: "It is preposterous to blame the Lynmouth flood on such experiments". Eden also said "The storm which caused the 1952 disaster was not confined to the Lynmouth district." while in reality "The East and West Lyn rivers, which drop rapidly down from Exmoor, were swollen even before the fatal storm."
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