WATER authorities have worked hard in the past week to keep Dartmouth Dam from spilling.

More than 60mm fell in the Mitta Mitta River area during the past week with the giant dam already technically full.

Releases had been increased to 3000 megalitres a day from the dam in the past week in anticipation of higher flows.

"At present, it is not expected that water will flow over the Dartmouth Dam spillway," a Murray Darling Basin Authority spokesman said.

"Where possible, MDBA will pass inflows through the dam wall via the power station or outlet valves and maintain the storage below the level of the spillway."

Authorities are concerned about water erosion of Dartmouth's rocky, stepped spillway.

MDBA storages are now slowly falling as irrigators drown down water supplies and are 98 per cent full.

The Grampians storages are almost 60 per cent full against 69 per cent at this time last year.

Meanwhile, forecasters have dropped all predictions of an El Nino dry weather pattern developing this year. The bureau said atmospheric indicators such as the Southern Oscillation Index, trade winds and tropical cloud patterns had persisted at neutral levels through much of the southern winter and spring.