22/02/2026
Yarralumla Creek flooding is not a new problem. The Citynew has a letter with some history. Its at https://citynews.com.au/2026/saved-by-the-grand-wizard-and-his-magic-paint/?utm_source=mailpoet&utm_medium=email&utm_source_platform=mailpoet&utm_campaign=canberra-daily-today-s-news-today_7801
or below.
Creek water ‘bottleneck’ threatens development
I was a hydraulic engineer working for the Department of Works in January 1971 when a super cell thunderstorm 1-in-500-year event dumped over several hundreds of millimetres of rain in one hour, causing several people to tragically lose their lives.
Water from the Yarralumla Creek flows quickly past the Ivy apartment building in Phillip during the recent storm. Photo: Andy Stodulka
The water in the Yarralumla Creek topped the Curtin/Hughes overpass over the creek as well over the culverts on Hindmarsh Drive; so you can imagine the devastation.
Unfortunately, the Ivy apartment complex is situated downstream of the confluence of the creek from Mawson and Isaacs so it bottlenecks just upstream from the second-level underground carpark of the Ivy.
Although the roundabout has been upgraded since 1971, the dimensions of the channels are the same as in 1971. In fact, the culverts were not blocked and the surge topped the roundabout by several metres.
It doesn’t take much imagination to have a scenario in the current extreme climate events where, with all the built up development that did not exist in 1970, the floodwaters could previously spread over to the hospital etcetera would now bank up and possible double in height adjacent to the underground carpark and start flooding it, shorting out the security roller door and the lifts, so trapping the occupants (and the cars).
The carpark entry faces the confluence and is a little above embankment level. This scenario was clearly not contemplated in the original design.
To avoid this or at least minimise the potential disaster, I suggest that a battery operated barrage or caisson be constructed across the entry to the driveway of the Ivy underground carpark, which would be an excellent investment considering potentially about $10 million of cars being destroyed!
The potential flooding also impacts any planned development of the light rail and the proposed unit development north of the interchange.
Andy Stodulka, via email
"We know though, that the ACT government cares for those of us who live southside, so periodically high-order magicians are dispatched to solve the problem," says letter writer HENRY MOULDS of Wanniassa.