The state's Water Commissioner David Harriss says there are progressing to be issues in nearly each river valley obtaining that water to icon sites.
"Certainly to satisfy the big volumes from regulated flow within the lower reaches of the Murray River goes to be exceptionally tough," he said.
"It's progressing to be attempting to line up high flows within the Murray, the Murrumbidgee, the Victorian tributaries, out of the Goulburn and water starting off of the Menindee Lakes.
"And that is never been done before, it's progressing to be very tough."
Dams along the Murray and Murrumbidgee rivers are being mooted to store environmental water for icon sites within the Murray Darling Basin.
The New South Wales workplace of Water says it's investigating mid river storages downstream of the most Murray and Murrumbidgee irrigation areas.
The state's Water Commissioner David Harriss says the move may limit flooding of upstream land when the unbelievable volumes of water meant for come back to the surroundings are created.
"In the Murrumbidgee we'd be watching areas like Tom Bullen storage which type of stuff," he said.
"In the Murray Valley you would be watching, 'Can water be stored within the Euston Lakes?'
"What edges are there as a result of they are downstream of the Barmah-Millewah choke.
"But there is restricted capability in those lakes, compared to the foremost storages you have high up within the catchment areas."
New South Wales is ruling out the compulsory acquisition of land which can be flooded by environmental flows for icon sites within the Murray Darling river system.
Mr Harriss says the New South Wales government has created clear its position concerning how the matter ought to be addressed.
"They wish access to flooding land to be either negotiated or compensated,"
"There ought to be no compulsory acquisition of water and there ought to be no compulsory acquisition of land or floodplain easements to supply that water.
"It ought to be for the duration of negotiation."