1 9 7 6 ▁and ▁expanded ▁in ▁ 1 9 8 9 ▁and ▁ 2 0 1 1 . ▁ ▁Stage ▁One ▁was ▁completed ▁in ▁ 1 9 7 6 , ▁and ▁provided ▁ ▁of ▁pot able ▁water ▁storage ▁and ▁supply . ▁ ▁Stage ▁Two ▁was ▁completed ▁in ▁ 1 9 8 9 , ▁when ▁storage ▁of ▁pot able ▁water ▁was ▁increased ▁to ▁. ▁This ▁stage ▁was ▁completed ▁at ▁a ▁cost ▁of ▁ 4 2   mill ion ▁and ▁involved ▁raising ▁the ▁main ▁emb ank ment , ▁sp ill way ▁and ▁int ake ▁to wers ▁by ▁approximately ▁ ▁to ▁create ▁a ▁surface ▁area ▁of ▁. ▁ ▁In ▁ 2 0 0 4 ▁the ▁Gold ▁Coast ▁City ▁Council ▁resolved ▁to ▁construct ▁Stage ▁ 3 ▁of ▁the ▁dam . ▁When ▁the ▁dam ▁reached ▁full ▁capacity , ▁on ▁ 7 ▁January ▁ 2 0 0 8 ▁work ▁began ▁on ▁Stage ▁ 3 ▁and ▁was ▁completed ▁on ▁ 1 9 ▁December ▁ 2 0 1 1 . ▁After ▁nearly ▁four ▁years ▁of ▁construction ▁the ▁construction ▁cost ▁was ▁ 3 9 5   mill ion . ▁The ▁Stage ▁ 3 ▁works ▁increased ▁the ▁height ▁of ▁the ▁dam ▁wall ▁from ▁ ▁to ▁, ▁and ▁increased ▁the ▁res er voir ▁capacity ▁from ▁ ▁to ▁, ▁with ▁the ▁added ▁purpose ▁of ▁flo od ▁mit ig ation , ▁beyond ▁water ▁supply . ▁Stage ▁ 3 ▁construction ▁was ▁completed ▁by ▁the ▁Hin ze ▁Dam ▁Alliance , ▁a ▁joint ▁vent ure ▁between ▁Seq water , ▁with ▁private ▁sector ▁partners ▁U RS ▁Corporation , ▁S