Heavy rain last evening and early hours this morning, caused havoc in several localities in Hyderabad. As much as 5 cm rain in less than an hour last evening, caught drivers unaware on main roads. Roads and lanes in some areas in old city and other parts resembled lakes. Water entered the houses in some areas. Disaster management teams of Greater Hyderabad Municipal Corporation (GHMC) quickly swung into action, after viewing the waterlogged roads and inundated houses, through central CCTV footage, to take up relief measures.