Hyderabad, May 6 -- Nearly two-and-a-half months after the collapse of the roof of Srisailam Left Bank Canal tunnel at Domalapenta in Telangana's Nagarkurnool district, the state government is struggling to find an alternative solution to complete the project which has become a challenging task, officials familiar with the matter said.

The Rs.4,600 crore tunnel project aims to transfer Krishna river water from the Srisailam reservoir to provide irrigation to 400,000 acres in the erstwhile combined Nalgonda district besides providing drinking water to 516 villages en route.

Out of the total length of 44 km of the main tunnel, a 20.5 km stretch was completed from Devarakonda end and another 14 km from the inlet end at Domalapenta. Two tun...