The first activity of MCMC's Upper Merri Sodic & Erosive Soils Working Group kicked off with a special presentation by eminent soil scientist Dr Robert van de Graaff in October 2019. Dr van de Graaff explained that due to the geological and climate history of the Merri Creek catchment, most soils in the catchment are sodic and thus highly susceptible to erosion. These soils present major challenges for urban development and until now have been largely overlooked. Detailed mapping of the soils and assessment of the degree of risk they pose is sorely needed. Dr van de Graaff's presentation is here (8.8MB pdf).
Photo: The muddy Merri (foreground), thick with sediment from sodic soils in the upper catchment, meets the Yarra, June 2018 © Katrina Roberg
The promise of a new Upper Merri Park linked to a Wallan Regional Park along the Merri is coming closer to reality. Both are critical parts of the Greater Wallan-Merri Park concept, a 2016 joint initiative of MCMC, Friends of Merri Creek and Wallan Environment Group to create A living landscape for a liveable Melbourne.
The Upper Merri Park is one of five new 'suburban' parks the State Government has committeed to. A feasibility study for the Wallan Regional Park is also commencing. The park boundaries will be determined through consultation with stakeholders and community.
MCMC had a very positive first meeting with the DEWLP project officers for the Upper Merri Park in mid-July 2019 - see below for key steps and time-lines for the park development process.
The failure of a constructed waterway near Donnybrook Rd Mickelham was highlighted in 2018 by Merri Creek Management Committee (MCMC) in our Muddy Merri Troubles Report. Behind the scenes, Melbourne Water have been working to rectify the problems exposed by this waterway. In April 2019 they provided a welcome update to MCMC on the progress of this matter.
Melbourne Water have also acknowledged the widespread occurrence of problematic soils in the Kalkallo Creek sub-catchment of the upper Merri (west of the Hume Highway between Donnybrook Rd and Beveridge). They will require all future developers to address the issue of erosive/dispersive soils earlier in the planning/design process to avoid similar problems occurring.
Read more below for full comments from Melbourne Water and an outline of the rectification options.
Photo: Constructed section of Donnybrook Creek south of Donnybrook Rd, Mickelham, August 2018. The channel is eroding, rilling erosion can be seen under the jute matting (dark lines), the jute matting has been ripped apart by high flows, and the slopes above the jute matting are poorly stabilised and eroding.
During the 2018 Victorian election campaign, the ALP promised to create the new Upper Merri Parklands. This is a welcome recognition of the importance of the upper Merri and the potential for continuous linked parkland along the entire length of Merri Creek. It reflects a 2016 joint initiative of MCMC, Friends of Merri Creek and Wallan Environment Group for the creation of the Greater Wallan-Merri Park, a living landscape for a liveable Melbourne. We look forward to the new Labor government delivering on this promise as prompt action is needed to secure the park.
Labor's commitment also included funding a feasability study for the Wallan Regional Park. This new park, centered on the former Hernes Swamp, is a key part of our vision for the Greater Wallan - Merri Park. It includes the potential to reinstate parts of the swamp, to create an attractive, biodiverse focus for the park.
(Photo: upper Merri Creek in Merriang.)
In contrast to the good news that Moreland Council is buying land for the Merri Creek corridor, it's hugely disappointing to report that Melbourne Water is planning to sell off Merri Creek land, land designated part of the Merri Creek Marran Baba Parklands. This 'surplus' land, at the rear of an industrial property in Trawalla Ave, Thomastown, is part of an original floodplain reserve owned by Melbourne Water. Over a number of years it was improperly occupied, filled and built on by the adjacent landowners, previous and current. Despite its modified conditon there is no reason it can't be ecologically restored, as has been achieved for many formerly degraded areas along Merri Creek.
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