 The Riverina is drained by the large Murray @-@ Darling Basin . Rivers and streams in the Riverina generally flow east to west . As well as the Murray , Murrumbidgee and Lachlan , other streams include Billabong Creek and the Edward River , an anabranch of the Murray . Much of the water carried by these streams is diverted . In 2001 – 2002 , 52 % of the Murray and Murrumbidgee water runoff was diverted , 77 % of which was used for irrigation . 
