I have to agree, man made carp ponds are gun when you don't want to travel far, and carp are so much fun on the light gear, however I won't go lighter than 6lb because the bigger fish (75-80cm) make mincemeat out of me.
I personally don't have any issues with carp going back in man made contained waterways, even though I usually keep my carp and turn them into saltwater baits, whole baby carp for mulloway, and strips of carp flesh for salmon and flathead. In fact the flatties absolutely love carp strips, I think it's because of the strong smell.
Also get one of those wire squid jigs, poke it through a baby carp, and wait for a big squid to grab on. You will be pleasantly surprised.
Steve