Tunnel under the airport ASAP!

Ideas and concepts of what Adelaide can be.
Aidan
Super Size Scraper Poster!
Posts: 2088
Joined: Fri Dec 08, 2006 3:10 am

Tunnel under the airport ASAP!

Post by Aidan »

I've finally thought of a way we could take advantage of Covid:
With very few aircraft using Adelaide Airport at the moment, and widebodies in particular likely to be seldom seen this year and next, there's far less need to keep the main runway open for its full length. Which means we have a rare opportunity to build cut and cover tunnels, enabling Morphett Road and Richmond road to be extended directly to the airport terminal much more cheaply than the cost of the bored tunnels which would otherwise be required.

With record low interest rates, and probably never to be repeated low construction costs, now would be the ideal time to invest in Adelaide's future. And there's even the possibility of toll revenue, as many people would normally be averse to paying tolls would gladly pay for the convenience of not having to leave for the airport so soon!
Just build it wrote:Bye Union Hall. I'll see you in another life, when we are both cats.
Nort
Legendary Member!
Posts: 1392
Joined: Tue Feb 09, 2010 2:08 pm

Re: Tunnel under the airport ASAP!

Post by Nort »

Aidan wrote:
Mon Nov 02, 2020 11:05 pm
I've finally thought of a way we could take advantage of Covid:
With very few aircraft using Adelaide Airport at the moment, and widebodies in particular likely to be seldom seen this year and next, there's far less need to keep the main runway open for its full length. Which means we have a rare opportunity to build cut and cover tunnels, enabling Morphett Road and Richmond road to be extended directly to the airport terminal much more cheaply than the cost of the bored tunnels which would otherwise be required.

With record low interest rates, and probably never to be repeated low construction costs, now would be the ideal time to invest in Adelaide's future. And there's even the possibility of toll revenue, as many people would normally be averse to paying tolls would gladly pay for the convenience of not having to leave for the airport so soon!
I'm unsure how it follows from reduced aircraft numbers that the runways full length isn't required.
User avatar
[Shuz]
Super Size Scraper Poster!
Posts: 2683
Joined: Sun Apr 10, 2011 5:26 pm

Re: Tunnel under the airport ASAP!

Post by [Shuz] »

Logic isn't really Aidan's strong suit...
Any views and opinions expressed are of my own, and do not reflect the views or opinions of any organisation of which I have an affiliation with.
User avatar
SRW
Donating Member
Donating Member
Posts: 2947
Joined: Fri Jun 08, 2007 9:42 pm
Location: City

Re: Tunnel under the airport ASAP!

Post by SRW »

The airport is already proposing connections to these roads for rideshare and freight vehicles without the need for tunnels. It's unclear to me what benefit general access would deliver for the cost.

If you were arguing for a Morphett Road connection to the north of the airport (to maybe Findon Road) that might be more interesting as an arterial alternative to Marion and Tapley's Hill roads. But still inconceivably costly for the benefit.
Keep Adelaide Weird
Aidan
Super Size Scraper Poster!
Posts: 2088
Joined: Fri Dec 08, 2006 3:10 am

Re: Tunnel under the airport ASAP!

Post by Aidan »

[Shuz] wrote:
Tue Nov 03, 2020 1:42 pm
Logic isn't really Aidan's strong suit...
Genuinely curious: what gives you that impression?
Just build it wrote:Bye Union Hall. I'll see you in another life, when we are both cats.
Aidan
Super Size Scraper Poster!
Posts: 2088
Joined: Fri Dec 08, 2006 3:10 am

Re: Tunnel under the airport ASAP!

Post by Aidan »

Nort wrote:
Tue Nov 03, 2020 10:49 am
I'm unsure how it follows from reduced aircraft numbers that the runways full length isn't required.
Long runways are really only needed for long haul flights, but there are very few of those at the moment.

I'm sure a commercial arrangement could be arranged with the airlines to keep those few services running by making a fuel stop at another Australian airport on the way out. Because there are so few flights, it shouldn't be that expensive.
Just build it wrote:Bye Union Hall. I'll see you in another life, when we are both cats.
Aidan
Super Size Scraper Poster!
Posts: 2088
Joined: Fri Dec 08, 2006 3:10 am

Re: Tunnel under the airport ASAP!

Post by Aidan »

SRW wrote:
Tue Nov 03, 2020 1:53 pm
The airport is already proposing connections to these roads for rideshare and freight vehicles without the need for tunnels. It's unclear to me what benefit general access would deliver for the cost.
AIUI what the airport is proposing involves general access on an indirect route.
If you were arguing for a Morphett Road connection to the north of the airport (to maybe Findon Road) that might be more interesting as an arterial alternative to Marion and Tapley's Hill roads. But still inconceivably costly for the benefit.
A connection to Findon Road would be part of the eventual aim, along with grade separating Morphett Road and connecting it to the Southern Expressway near Majors Road. But that's decades into the future. Meanwhile, faster connections to the airport would bring enormous benefits to all its users in the southern suburbs.
Just build it wrote:Bye Union Hall. I'll see you in another life, when we are both cats.
Nort
Legendary Member!
Posts: 1392
Joined: Tue Feb 09, 2010 2:08 pm

Re: Tunnel under the airport ASAP!

Post by Nort »

Aidan wrote:
Tue Nov 03, 2020 10:32 pm
Nort wrote:
Tue Nov 03, 2020 10:49 am
I'm unsure how it follows from reduced aircraft numbers that the runways full length isn't required.
Long runways are really only needed for long haul flights, but there are very few of those at the moment.

I'm sure a commercial arrangement could be arranged with the airlines to keep those few services running by making a fuel stop at another Australian airport on the way out. Because there are so few flights, it shouldn't be that expensive.
Adds a lot of delays and expense, which if it was a worthwhile project could be worth it, but doesn't seem like it would stack up in this case.
User avatar
ynotsfables
High Rise Poster!
Posts: 290
Joined: Tue Aug 14, 2007 11:15 am

Re: Tunnel under the airport ASAP!

Post by ynotsfables »

[Shuz] wrote:
Tue Nov 03, 2020 1:42 pm
Logic isn't really Aidan's strong suit...
Oh and what’s your logic?
Aidan
Super Size Scraper Poster!
Posts: 2088
Joined: Fri Dec 08, 2006 3:10 am

Re: Tunnel under the airport ASAP!

Post by Aidan »

Having thought about it a bit more, I've realised a straight extension of Morphett Road would not be suitable for the cheapest form of tunnel (which involves digging a trench, lifting in a box culvert and backfilling) because it would also affect the crosswind runway. However a tunnel from the central airport area (SW of the terminal building) to the (as yet unbuilt) road linking Morphett Road and Richmond Road would bring similar immediate benefits and enable about 2.5km of runway to be kept open at all times.

Doing this would be great for buses - it would reduce the J7/J8 journey time by ten minutes, as well as enabling buses to get from the airport to Glenelg more quickly.
Just build it wrote:Bye Union Hall. I'll see you in another life, when we are both cats.
User avatar
1NEEDS2POST
High Rise Poster!
Posts: 295
Joined: Tue Jun 26, 2018 5:01 pm

Re: Tunnel under the airport ASAP!

Post by 1NEEDS2POST »

You might be interested in this thread. There is official talk of an "airport link" with the North-South motorway. https://www.sensational-adelaide.com/fo ... start=4920

Another totally different idea: instead of a tunnel, we could have a lowered O-Bahn along Keswick Creek. It's too narrow for a multi-lane road, but an O-Bahn should fit. Some backyards might need to be acquired.

Buses come from the city on the red line, then enter the O-Bahn in the median on James Congdon Drive. The blue line is the O-Bahn to the airport. The intersection with Sir Donald Bradman Drive would need to be modified to allow buses to turn onto James Congdon Drive.
keswick-creek-drain.png
Aidan
Super Size Scraper Poster!
Posts: 2088
Joined: Fri Dec 08, 2006 3:10 am

Re: Tunnel under the airport ASAP!

Post by Aidan »

1NEEDS2POST wrote:
Thu Nov 12, 2020 9:43 pm
Another totally different idea: instead of a tunnel, we could have a lowered O-Bahn along Keswick Creek.
An O-bahn that floods every time it rains???
Just build it wrote:Bye Union Hall. I'll see you in another life, when we are both cats.
User avatar
rev
SA MVP (Most Valued Poster 4000+)
Posts: 4681
Joined: Sat Nov 11, 2006 12:14 pm

Re: Tunnel under the airport ASAP!

Post by rev »

If they buy up the properties along that stormwater drain, they could build a non-stop road.
Bit of a funky interchange linking it to the NSM and JCD, run the road around the northern end of the airport and some on/off ramps at Sir Richard Williams ave..and you have your airport link. Marion Road could be an underpass.
Would be easier then upgrading SB drive or HBR both of which would cause significant traffic disruptions.

Could also work for an express rail link between the airport and city.
User avatar
Ho Really
Super Size Scraper Poster!
Posts: 2527
Joined: Sun Aug 27, 2006 3:29 pm
Location: In your head

Re: Tunnel under the airport ASAP!

Post by Ho Really »

rev wrote:
Sun Nov 15, 2020 9:59 pm
If they buy up the properties along that stormwater drain, they could build a non-stop road.
Bit of a funky interchange linking it to the NSM and JCD, run the road around the northern end of the airport and some on/off ramps at Sir Richard Williams ave..and you have your airport link. Marion Road could be an underpass.
Would be easier then upgrading SB drive or HBR both of which would cause significant traffic disruptions.

Could also work for an express rail link between the airport and city.
Buying up properties would be the best solution for either a road as you suggest rev or the rail link that I have been saying for years. Aidan I bet if you wanted you could come up with solutions for a drain. As far as I know (correct me if I'm wrong) the Keswick Creek is mostly already diverted. It could be taken further and all water eliminated completely. The drain is perfect for a single track and a loop where there is the access road and will be grade separated at Marion and South Roads. No intermediate stops between Airport and City unless one wants two stations under these two main roads.

Cheers
Confucius say: Dumb man climb tree to get cherry, wise man spread limbs.
Nort
Legendary Member!
Posts: 1392
Joined: Tue Feb 09, 2010 2:08 pm

Re: Tunnel under the airport ASAP!

Post by Nort »

The Keswick creek is an important part of stormwater removal for the area, with the area considered especially susceptible to once in a hundred year floods.
Post Reply