Why Rail Under Road is possible at Seaford

July 27, 2017 Moira Harbour 3 comments

The Seaford technical report (available at http://levelcrossings.vic.gov.au/media-library/publications/frankston-publications/reports/seaford-technical-report) states:

LXRA Myth… When considering the best way to remove the Seaford Road level crossing, environmental factors are particularly challenging in terms of groundwater flows, flooding and potential impacts to the nearby Edithvale-Seaford wetlands and Kananook Creek.

These environmental problems ruled out the building of a trench at this site. This image shows the underground conditions at Seaford. In Seaford, there are clay layers that are close to the surface.

A trench structure, combined with the clay, would change groundwater flow, as water would need to divert around the trench. This means that water levels on the inland side could rise, causing potential impacts to the wetlands. Water levels on the coastal side could fall, which would in turn affect the environmental values of Kananook Creek.

Image from LXRA technical report

More details about “hybrid solution” – see at LXRASeafordReport

Edithvale_Seaford_Wetlands_Ecological_Character_Description (2) (1)

We have 3 points to consider here:

1. Groundwater issues have been successfully tackled on many sites on Mornington Peninsula, and everywhere else in the world.

Groundwater obstacles can be overcome at the Seaford Rd site just like any other site. A number of train stations have ground water pumps. A more challenging example is of Martha Cove road tunnel under the water channel, close to the shore.

Road tunnel under water at Safety Beach – Martha Cove

2. Seaford Wetlands has own engineering controls for water levels

Seaford Wetlands are now largely Artificial and Actively managed with current engineering controls that regulate the hydrological operations controlling the water coming in and out from the various sources. Water levels are regulated through the various cells and then in turn the water is released to storm water drains or the Kananook creek via further engineering controls.

There would be no change to water levels at the Seaford Wetlands with the Rail under solution, due to the current engineering controls designed to regulate the hydro-logical operation of the area.

In an effort to fast track the Seaford Rd level crossing removal the LXRA have skipped detailed technical investigations at the Seaford Rd site. They have not looked into the current engineering controls at the Seaford wetlands, which could manage the water levels of the Seaford wetlands with a rail under road solution

3. The proposed train trench is short and shallow

 The proposed solution, based on surveying and 3D modelling data demonstrates that the actual trench would be a maximum of around 180 meters either side of the level crossing before it is back at the current level of the RF Miles Reserve 1.5 AHD. Any embankments above and beyond this would be soft planted ones to match the current landscape.

3 Comments on “Why Rail Under Road is possible at Seaford

  1. I was at the protest in Seaford in July. I agree the rail under is a great alternative to Sky Rail .

  2. I was unable to attend the NoSkyRailFrnakstonLine protest rally on Sunday, 23 July. My wife was celebrating a significant birthday with family in Northcote. We are both, however, of one mind regarding NoSkyRail at the Seacord Road crossing. We have considered the issues carefully, and are both shocked at the way Seaford residents are not receiving the same consideration as residents near other Frankston Line crossings.
    For nearly 40 years we have cherished the local environment, and a SkyRail development would be a devastation – not just for us, whose children grew up here to love and admire this beachside environment, but especially for coming generations. What would they think os us for bequeathing to them the eyesore of a highrise rail blocking their horizons and lumbering across backyard fences? They deserve better, and the government of this day has the responsibility to relieve our anxieties in regard to this crossing. It must surrely realise the profound impact the implementation of the SkyRail would have upon voting intentions.

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