Thousands have been affected and several lives lost in floods due to heavy rainfall for past few days in Nepal.
Over a dozen people were killed on Tuesday after being swept away by flood waters or buried by landslides, local newspapers and television channels reported.
Many areas in Terai plains have been inundated while landslides in the hilly regions have damaged houses, killed residents and blocked roads.
Four persons were swept away by overflowing streams in Makwanpur, Tanahun, Ilam and Baglung. Bodies of three others missing in flood waters were recovered in Chitwan.
Five persons were buried in a landslide at Taplejung in north-eastern part of the country. Rescue teams had not reached the site due to rains and blocked roads.
Most rivers in the plains are in spate and some flowing over the danger mark. Hundreds of houses and fields on the banks of Koshi and Mahakali rivers have been inundated forcing thousands to flee to safer areas.
To prevent over-flooding due to rising water level at several points in the Koshi barrage, 39 of the 56 gates were opened on Tuesday.
Over-flooding in the Koshi had caused havoc in Nepal and affected millions in neighbouring Bihar two years ago.
Reports say over a dozen restaurants and hotels near Chitwan National Park, a popular destination among tourists, have been flooded.
Officials led by Chief Secretary Madhav Prasad Ghimire inspected areas in Kanchanpur on Wednesday where embankments were breached by the rising waters of Mahakali.
He instructed officials and army and police teams involved in rescue and relief work to repair the embankments soon and provide shelter and food to the affected families.