Pummeled by heavy rain over the past week, Odisha, is bracing for a "medium flood" in the Mahanadi river basin with the formation of another depression over the Bay of Bengal, the Met office said on Sunday. A well-marked low pressure system intensified into a depression over northwest Bay of Bengal and crossed the coast near Digha in West Bengal between 10.30-11.30 am, triggering downpour in many areas.