Around 60,000 cusecs is flowing in Vellaru and 30,000 cusecs in Kollidam, which is the biggest river in the district, according to sources. As the Veeranam lake, the lifeline of Chennai, is nearing its full level, excess water is being discharged from the water body. Besides, all tanks, canals and channels are overflowing in the districts and crops in several thousands of acres have been destroyed in the floods.