Kalabagh Dam for financing assistance, but due to strained relations with Afghanistan (a Soviet ally), this request was denied. The government then approached the World Bank, which agreed to finance the project. At this point in Pakistan's history, previous dam projects such as Mangla (under Ayub Khan) and Tarbela (under Zulfikar Ali Bhutto) never faced any opposition. Even Kalabagh was approved by the Central Development Working Party, without dissent. The issue of Kalabagh started to become politicized after the execution of the former Prime Minister Zulfikar Ali Bhutto, a highly popular leader from the downstream province of Sindh. Adding to the controversy,
Mangla Dam releases at the artificial head of the reservoir. The project, though not initially designed as one, also works as a flood control structure by retaining water during the flood-prone season of Monsoon. On December 5, 1971, the dam was damaged due to a bombing raid conducted by the Indian Air Force during the Indo-Pakistani War of 1971. This was against the international convention that large water reservoirs would not be targeted in war. As a consequence, the hydro project was temporarily out of service. From the data available in 2009, the project had generated 183.551 billion units of low cost