Even a tightening budget due to upcoming flood rehabilitation programs on areas ravaged by the disaster would not convince the federal government to at least delay its $37 billion national broadband network project.

Prime Minister said on Friday that pushing back the NBN project calendar to fund the government's flood recovery efforts would be unwise.

Ms Gillard's remarks were in reaction to mounting calls from the Coalition and business leaders that the billion-dollar federal initiative should not be prioritised in light of the more daunting tasks ahead that the government needs to address.

Rebuilding Queensland and Victoria while minding a balanced national budget are more important obligations at this time, according to the opposition and the United Retail Federation, and the NBN roll out can wait out until the country has at least achieved substantial recovery from the flooding disaster.

However, the prime minister could not agree with the suggestions as she told ABC that the NBN project is too important to be sacrificed, even temporarily.

Ms Gillard stressed too that "the national broadband network is an investment we have made that is going to pay a return to taxpayers," as she clarified that "it is not money in the government budget that can be reallocated from the NBN to another purpose."

More so, Ms Gillard emphasised that as a major infrastructure investment, the NBN is a very important component of the economy that would ensure its sustained growth and even "regional communities hit badly by the flood will also benefit from the scheme."

The prime minister noted that much of the damages wrought by the flooding disaster were concentrated in regional areas of Queensland and Victoria, which she said are "exactly the places and exactly the local economy that will benefit from the NBN."

Suspending the NBN roll out, according to Ms Gillard, will rob regional communities, located on these areas, of economic opportunities set to be delivered by the project. Such prospect is even in the consideration of the government, said the prime minister.