Bihar government has sounded flood alert in nine districts in central and northern part of the state following release of over five lakh cusecs of water from Bansagar dam in Madhya Pradesh.Chief Minister Nitish Kumar conducted an aerial survey of the areas surrounding Sone and Ganga rivers where the discharged water has created flood like situation.Mr Kumar said, measures have been put into place to tackle any situation arising out of an overflow from Indrapuri barrage in Bihar, where water has reached from MP.