I had a look at another local drain the other night that I'd suspected would be pretty large. As it turns out, my suspicions were correct. It was a nice long walk with no crouching whatsoever.
Overall, the drain had been pretty average thus far; no real noteworthy features. The outfall, however, I thought was very impressive. Feeding into a river, underneath a certain complex. Still, it was very interesting to venture under another another local suburb!