Looking at the NOAA chart for 1.5 miles off Port A directly away from Harbor Island looks to be 15 to 20 feet deep the Gulf is shallow across a wide continental shelf. Depth is not so important for dispersal of brine vs mixing velocity and flow rates. The you use multiple nozzles that entrain flow of the surrounding lower saline water and mix it under high velocity flow with 10 or more times the volume of the ejected brine by the time this now mixed stream slows down and further mixes any local sea life can swim through it with little effect. Texas has a pretty strong long shore current that will push the plume to the south and any density current would flow down slope properly mixed there shouldn’t be a density current.
My thoughts, exactly! 🤓