Yeah it 100% does - mixing rate is a big design driver. We actually had decided that is was better for our primary effluent pipe to be several KM longer to rea

Yeah it 100% does - mixing rate is a big design driver. We actually had decided that is was better for our primary effluent pipe to be several KM longer to reach the “coast” vs the smaller bay that we were immediately adjacent to. But even then, if the ends of your system are in 50’ deep ocean, the water column is such that the top ~10% sees really good mixing and exchange due to wind and wave action but the rest really doesn’t. It’s rare that there are strong currents near enough coastlines to take advantage of.