A nation wants to utilize a large, currently brackish & endoheric body of water for irrigation & drinking. Damming the rivers & moving the water from there isn't considered viable for the reasons that they want the inland sea to remain intact, & that the areas where the rivers enter the lake are on the exact opposite side of where the major cities that need the water & ports for exporting food are.
The plan id to take the water from the lake to the ocean at a similar rate as water is entering the lake, over time this outflow would lower the salinity as it would no longer be functioning as an endoheric lake. After long enough the water would have low enough salinity for drinking & irrigation from the provision of the outflow.
Ecological collapse isn't considered much of a concern as most of the life in the endoheric lake/inland sea in question is also found in the rivers draining into it. The body of water is a bit less saline than the Aral sea before it started to dry up at 8g of salt a litre (vs 35 grams of salt a litre for sea water) & is somewhat larger than the Aral sea was at around 71,000km^2. The technology they're trying to do this with is roughly that of the early cold war, think 1950s-1960.
Would turning a inland brackish sea into freshwater by artificially adding an outflow be possible?