New Delhi, Sep 11 (IANS) President Pratibha Patil Thursday donated a month's salary to the Prime Minister's National Relief Fund for the Bihar flood victims.

The president has contributed a month's salary towards the relief and rehabilitation of those affected by the unprecedented floods in the state caused by the Kosi river, a statement from Rashtrapati Bhavan said.

The floods have claimed at least 50 lives, according to official estimates.

Over 2.7 million people and nearly one million cattle have been affected by the floods caused by a breach in an embankment of the Kosi upstream in Nepal. About 100,000 hectares of farmland have been submerged and nearly 300,000 houses damaged.