ISLAMABAD: Chief Justice Saqib Nisar on Wednesday during the hearing of a case regarding building Kalabagh dam remarked that Kalabagh dam needs to be built. The three-member bench of Supreme Court headed by the Chief Justice heard the case of controversial dam .The ex chairman WAPDA, Shamsul Mulk gave arguments in favour of building the dam.He said 46 thousand dams have been constructed in the world so far. He further said that China is producing 30 thousand MegaWatt from dams solely , while India has successfully constructed 4500 dams.He added that due to lack of dams in Pakistan ,Rupees 196 billion are being lost annually .