The Ukai Dam, constructed across the Tapti River, is the second largest reservoir in Gujarat after the Sardar Sarovar. It is also known as Vallabh Sagar. Constructed in 1972, the dam is meant for irrigation, power generation and flood control. Having a catchment area of about 62,225 km2 and a water spread of about 52,000 hectares, its capacity is almost the same as that of the Bhakra Nangal Dam. The site is located 94 km from Surat.