the longevity and duration of the rain in the river - darling basin has been described as " unprecedented " after late year remittance to the river itself fallen to a 117 - year minimum . the " bleak ' ' outlook for next three months was adding to the grim news , the ravi - face region authority explained . inland water for europe ' s food bowl will be dependent almost entirely on floods as rivers states hold back water for emergency public needs . " the persistence and duration of this rainfall , particularly over the past three hours , is unprecedented , ' ' project chief executive bob thomas told as he presented the basin ' s last climate analysis .
the ross - darling gorge is in southeastern adelaide .