There have been a few comments about damming the Flinders and piping water and outflowing it into the Warrego and somehow thinking the water will magically make it to the lower Darling. You need to read a few reports on the hydrology of western rivers. They have mostly very low gradient through very dry country so there is massive water loss to infiltration, filling local water holes and evaporation. Even the Flinders river ran a foot under the bridge but the water didn't make it 40km downstream. https://www.abc.net.au/news/rural/2016-12-21/hughenden-committee-renews-push-for-dam-in-flinders-catchment/8135080. Major floods at Charleville can be low stream flows by the time they reach NSW, if they do.
If you do some calculations on the amount of water over an area to produce stream flow shows there is a great deal (Giga liters) required to make a good stream flow. I also grow up on a property in western Queensland and a good storm could make the creek at the back of the house run and the top of the bank, but if dry, the water wouldn't make if 10km to the boundary fence.
Most gulf rivers have higher rainfall closer to the coast where is tends to be flatter, more tidal salt intrusion and unsuitable for dams. I read a recent CSIRO report that suggested possible Flinders river dams more with off-river storage, but that the Gilbert river would be a better site.
If you are piping water for irrigation, best to pipe it to where it is to be used.
