HYDERABAD: The Krishna river and its two major tributaries in Andhra Pradesh, Tungabhadra and Handri, rose menacingly to a level not seen in 100 years after they received unprecedented quantities of inflows, bringing both Kurnool and the pilgrim centre of Mantralayam under neck-deep water, besides inundating some 100 villages in Kurnool and Mahabubnagar districts.