He raised the issue through a letter to Union Home Minister Rajnath Singh and urged for an "early visit" of the Central team to the state.
The chief minister said the state had sent a detailed report to the Centre seeking Rs 4,111.98 crore for flood assistance this year after his meeting with Prime Minister Narendra Modi and Singh on August 23.
Subsequently, he added that the officials of the state were in "regular touch" with the Centre.
But yesterday, a letter from the Joint Secretary of the Home Ministry informed about "putting off" the visit due to a meeting of the Public Accounts Committee and the commencement of the Winter Session of Parliament from November 16.
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The Central team has now proposed to visit during the month-end, he added.
"You will agree that the assessment of damage due to flood should be held within a fixed time-frame. The fact is that the assessment work was to take place in September itself. Farmers in the flood-ravaged areas have started sowing the rabi and kharif crops and have also begun repairing the damaged private houses.
"The delay by the Central team to visit Bihar for the assessment of the damage due to flood puts a question mark on the attitude of the Centre to provide timely assistance. The visit of the Central team after two months of the flood is illogical," he added.
Kumar urged Singh to send the Central team "at the earliest", considering the "seriousness and sensitivity" of the situation for providing assistance to the flood-affected citizens.