Scores of houses and bridges have been swept away in several parts of the country as incessant rains have swelled rivers, posing a threat of massive flooding and causing panic among the local population.
At least 54 people have died in different parts of the country over the last two days, police said.
Pyuthan is among the 14 worst-hit districts where at least 26 people have died in floods and landslides.
The toll increased in the district after 17 people who were earlier reported missing following a landslide were found to be dead.
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Many of the deceased were earthquake victims who were living in a quake-damaged house after repair, police said.
Tens of thousands of Nepalese are still living in tents following the last year's devastating earthquakes that killed nearly 9,000 people.
Water levels were close to dangerous levels in Saptakoshi and Narayani rivers.
Water flow in the Saptakoshi river has crossed this year's highest mark after continuous rainfall for the past 10 days.
Water flow in the river was measured at 277,410 cusec yesterday morning, the highest for this year.
The gates were opened to allow release of water so that the risk in the barrage and upstream region could be minimised
About 34 houses were inundated in Nawalparasi district due to the swelling river.
A swollen Tinau river destroyed a suspension bridge at Butwal-13. Around 6,000 people are at risk.
Flooded Mechi river has swept away an embankment on the Indian side. After the incident, Naksalbari, Panitanki and other Indian markets have been waterlogged, said police.
(Reopens FGN22)
Nepal today decided to allocate 750 million Nepalese rupees (around USD 7.4 million) for the relief and rehabilitation operations, Home Ministry officials said.
The meeting of the Home Ministry officials held at the National Emergency Operation Centre decided to disburse the money for immediate rescue, relief and rehabilitation of the victims.