With the ever growing expansion of Ballarat, it appears as if some new drains have been created, in fact there's nearly 5 large RCP in one park, one of which you can stand up in! They all seem to be grated but not locked, so entry is possible, and as a result, watch this space for an expo report, coming soon!
It's a floodgate, but I'm unsure if it's a manual one or not, so hoping someone can chime in as I'm not looking to get suddenly flushed down a rcp after walking under a sensor