The Ukai Dam, constructed across the Tapi River is the largest reservoir in Gujarat. It is also known as Vallabhsagar. Constructed in 1972, the dam is meant for irrigation, power generation and flood control. Having a catchment area of about 62,255 sq.km  and a water-spread of about 52,000 hectares, its capacity is almost same as that of the Bhakra Nangal Dam. The storage capacity of Ukai dam is almost 46% of the total capacity of all the other existing dams in Gujarat if put together. Thus, it can be concluded that the rest of the dams have as little as 0.1% average storage capacity. During the last 40 years, the actual irrigation potential is attained through all the major and medium water resources projects in the State, which comprises only 14 million hectares.