Excess rainfall in Nepal and the swollen rivers flowing from the neighbouring country into north Bihar have only aggravated the flood situation in the eastern state.
According to official sources, more than 39 children had drowned so far in the past one fortnight in different parts of state due to flood water.
Among the 13 districts affected by the deluge, Sitamarhi and Madhubani were the worst-affected with 37 and 30 deaths respectively.
The number of deaths, that had remained unchanged at 123 on Thursday, saw an increase of four on account of two casualties each reported from Darbhanga and Kishanganj districts.
The CM said in the Assembly that the state requires more time as it is engaged in tackling flood in certain districts while a drought is looming large in other parts of the state.
Adil Hussain, who belongs to Assam's Goalpara district, said the country has not been able to come up with a "concrete plan" for tackling the problem even 70 years after Independence.
Both the deaths have taken place in Madhubani district.
The number of relief camps and people taking shelter in camps beside the number of community kitchens has gone down as the water level is receding, they said.
The flood also claimed the lives of 187 animals, including 16 rhinos, in the Kaziranga National Park.
Chief Minister Nitish Kumar on Sunday inspected flooded areas at Darbhanga, Katihar and Sitamrahi districts in Bihar where the monsoon deluge has claimed 102 lives so far.
All the five deaths were reported since Saturday from Madhubani district, which accounted for 23 casualties.
Around two lakh more people were affected by the flood on July 20, pushing the overall figure to 69 lakh people affected in 12 districts.
Prices of vegetables, such as tomato, peas and beans, also surged sharply over the last one week in Haryana, Punjab and Chandigarh owing to supply crunch caused by heavy rains.
A significant number of casualties have also been reported from districts like Araria, Madhubani, Purnea, Sheohar and Darbhanga.
The state government has installed 1,119 relief camps, spread across all the 12 affected districts, to ensure proper food and safe drinking water to those impacted by the deluge.