Deadly rain-related floods and landslides are common across South Asia during the monsoon season from June to September, but experts say climate change is increasing their frequency and severity.
Entire neighbourhoods in Kathmandu were inundated over the weekend with flash floods reported in rivers coursing through the capital and extensive damage to highways connecting the city with the rest of Nepal.
Kumar Tamang, who lives in a slum area by a riverbank, told AFP he and his family had to flee after midnight on Saturday as waters rushed into his shack.
"This morning we returned and everything looks different," the 40-year-old said.
"We couldn't even open the doors to our house, it was jammed with mud," he added. "Yesterday we were afraid that the water would kill us, but today we have no water to clean."
Nepal's home ministry said 104 people had been killed across the country with another 64 still missing.
Ministry spokesman Rishi Ram Tiwari told AFP that bulldozers were being used to clear several highways that had been blocked by debris, cutting Kathmandu off from the rest of the country.
"More than 3,000 people have been rescued," he added.
At least 14 of those killed were aboard two buses and were buried alive when earth from a landslide careened into a highway south of Kathmandu, Dhading district chief Rajendra Dev Pandey told AFP.
The valley in which the capital sits recorded 240 millimetres (9.4 inches) of rain in the 24 hours to Saturday morning, the country's weather bureau told the Kathmandu Post newspaper.
It was the highest rainfall recorded in the capital since at least 1970, the report said.
- Chest-deep water -
The Bagmati river and its numerous tributaries which cut through Kathmandu broke their banks, inundating nearby homes and vehicles after midnight on Saturday.
Residents struggled through chest-deep water to get to higher ground.
More than 3,000 security personnel were deployed to assist rescue efforts with helicopters and motorboats.
Rescue teams were using rafts to pull survivors to safety.
Domestic flights resumed in and out of Kathmandu by Sunday morning after weather forced a complete stoppage from Friday evening, with more than 150 departures cancelled.
The summer monsoon brings South Asia 70-80 percent of its annual rainfall.
Monsoon rains from June to September bring widespread death and destruction every year across South Asia, but the number of fatal floods and landslides has increased in recent years.
Experts say climate change has worsened their frequency and intensity.
A landslide that hit a road in Chitwan district in July pushed two buses with 59 passengers aboard into a river.
Three people were able to escape alive, but authorities managed to recover only 20 bodies from the accident, with raging flood waters impeding the search.
More than 260 people have died in Nepal in rain-related disasters this year.
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