GL ) ▁of ▁water ▁through ▁a ▁$ 1 ▁billion ▁invest ment ▁in ▁the ▁Murray – G oul burn ▁Gra vity ▁Ir rig ation ▁District s . ▁This ▁was ▁later ▁increased ▁to ▁$ 2 ▁billion ▁with ▁another ▁ 2 0 0 ▁GL ▁of ▁sav ings ▁identified . ▁ ▁The ▁G oul burn ▁is ▁Victoria ' s ▁largest ▁and ▁longest ▁river , ▁account ing ▁for ▁an ▁average ▁annual ▁flow ▁of ▁ 3 , 0 4 0 ▁GL ▁per ▁an num . ▁Of ▁this , ▁about ▁ 7 0 0 ▁GL ▁is ▁used ▁within ▁the ▁G oul burn - Bro ken ▁bas in , ▁and ▁a ▁further ▁ 8 5 0 ▁GL ▁transferred ▁to ▁ir rig ation ▁areas ▁outside ▁the ▁bas in . ▁After ▁transmission ▁losses ▁of ▁about ▁ 6 7 0 ▁GL , ▁a ▁net ▁out flow ▁from ▁the ▁bas in ▁to ▁the ▁Murray ▁of ▁ 3 5 0 ▁GL ▁remains . ▁The ▁population ▁of ▁the ▁bas in ▁from ▁this ▁source ▁is ▁given ▁as ▁ 1 0 0 , 0 0 0 . ▁In cluding ▁She pp art on , ▁E ch uca ▁and ▁the ▁trib ut ary ▁Bro ken ▁catch ment - ▁it ▁is ▁estimated ▁at ▁ 2 5 0 , 0 0 0 . ▁ ▁The ▁notion ▁of ▁diver ting ▁water ▁out ▁of ▁the ▁Murray ▁Dar ling ▁Bas in ▁to ▁provide ▁urban ▁water ▁supply ▁has ▁stir red ▁emot ions ▁among ▁country ▁and ▁city ▁residents . ▁D iver ting ▁water ▁between ▁bas ins ▁is ▁not ▁new ▁however . ▁The ▁Snow y ▁Mountains ▁Sch eme