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Sherwood Bus Depot to be raised an additional 1.3m due to Flood

Submitted by webmaster on Thu, 24/02/2011 - 10:12am

Another Development Application has been submitted regarding the Bus Depot in response to recent flooding of the site.  See application number A003012704 at council's website
"To whom it may concern,

Re: Sherwood Road Bus Depot

On the basis of our conversations and comparison of the original and updated layours provided (attached), we can confirm that the conclusions/outcomes of flood modelling and reporting ('Flooding Assessment Sherwood Road Bus Depot' Gilbert and Sutherland, February 2010) undertaken for the original layout remain valid.  Specifically, the new layout does not show potential to impact on modelled Q100 flood levels.

We trust this is acceptable.  Please do not hesitate to contact our office if you have any queries.

Yours sincerely

Owen Droop

Director/Principcal Water Resource Engineer

Gilbert and Sutherland

Perhaps local residents would like to post their photos of this site during the flood to assist the DA process?

PDF icon A003040066-Plans.pdf4.25 MB



These photos were taken a few hours after the flood peak.
End of Railway Terrace Corinda.

Looking across from Railway Terrace to Bus Depot site and remnants of Lahey's Timber Mill.
Sherwood Road just over railway bridge. Note newly installed No Right turn sign to depot site almost submerged.

The Bus Depot site itself - note water mark on white wall

The proposal to raise the level of the Bus Depot site is illogical.
In the case of another flood, the water that overflowed from Oxley Creek over the site would have to go somewhere else (assuming this proposal occured).  Stormwater systems draining to creeks or the river in floods are useless so the only place for the water to go is either into a detention pond (which would probably be full anyway due to the accompanying rain event) or increasing the level of water that invades surrounding homes and businesses.
I would assume that 1.3 metres clears the 2011 flood level by a few hundred millimeteres (the normal engineering practice and Planning Scheme requirement) - the 1974 flood was significantly higher than 2011 (around 2 metres in our area).  So two questions should be considered:
1.  Should the level of the site be raised, where will the displaced water be stored so that flooding in surrounding streets is not increased?
2. If a future flood is at the same or higher level than 1974, where does the Council intend to park 200 buses so that they are not destroyed by floodwater, the vehicle parking does not impede the flood recovery effort, the buses aren't intentionally damaged (as trains were during the 2011 flood) and the buses are accessible immediately after the flood event?
Hopefully these questions will be put to the Council at the upcoming State Government Inquiry.

Another Development Application for the bus depot A003040066 showing land fill profiles has been submitted for "Compliance Acceptance".  We note that the fill works have already started on the site.
In the first stage a total of 82,500 cubic metres of fill will be added to the site. (cut 11,000 cubic metres to give total of 93,500 metres of soil fill).  An additional 34,500 cubic metres of capping fill will be added in the 2nd stage.  This will be followed by a substrate and pavement layer per structural plans.
You can see the net effect of the level of fill with cross-section diagrams across the site showing level heights in the tables below the cross-section.  The maximum fill appear to be in the region of 3.3 metres, with an estimated 4.2 metres high for the noise retaining boundary wall.
We have posted a copy of the document here to simplify the process of viewing, but the original document can be found on council's website are the DA A003040066.
For those trying to intepret the diagram - on the first page you will see a circle with 1/C32, 2/C32, etc along the bottom and left hand side of the drawing.  These represent the lines running North-South and East-West that are then shown as cross sections in the separate diagrams labelled below.  These cross section diagrams show "existing surface" and the "bulk earthworks level" in the table beneath and you can calculate the net difference between the two to find the amount of fill being added to the site.