No, no raised banks. What about the brisbane river? I live in Bundy not birsbane, our local river is the Burnett. I know about flooding mate, I'm not as dumb as you may think. The Burnett river hasn't flooded in Bundy in decades, and by the time the water reached the pond, one silver perch will be the least of my worries, if the prch survived and got to the river, my end of the river is saltwater, this would kill the perch, and there is no way the perch could get to the freshwater part, it's blocked off by a barrage. Also that much excess rain water would no doubt kill the perch anyways. If it survives all this and somehow winds up at sandy hook. I think it'd deserve to live, lol.