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Wimmera CMA

Street Address:
24 Darlot Street, Horsham, 3400
(enter via Gleed St)

Postal Address:
PO Box 479, Horsham, VIC, 3402
Phone: (03) 5382 1544
Fax: (03) 5382 6076
Email: wcma@wcma.vic.gov.au
 
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Article

Update: Dunmunkle Creek Flood Investigation

Sep 30, 2017
 
Dunmunkle Creek at Rupanyup Dunmunkle Creek at Rupanyup

Recommendations to reduce flood impacts from Dunmunkle Creek

Removing channel banks and redundant water storages are among recommendations from a flood investigation presented to more than 50 people at a series of meetings at Rupanyup, Boolite, Murtoa and Lubeck.

The Dunmunkle Creek Flood Investigation recommendations include removing remaining channel banks within the Brynterion Forest, removing channel banks north of Rupanyup where practical and removing redundant GWMWater storages at Rupanyup.

The investigation, with support from a community and agency led steering committee, also recommends additional modelling of stormwater impacts on the eastern side of Rupanyup to identify solutions for reducing flooding.

Meeting participants identified and discussed in detail the need for careful consideration to future road infrastructure such as culverts, bridges, fords and even the road surface itself, because all have an ability to control the flow of water in such a flat landscape.

People at Boolite requested further consideration to channel removal south of Rupanyup which was presented to the Murtoa and Lubeck meeting participants.  The final report will include issues and concerns put forward at the meetings.

The Dunmunkle investigation covers an area up to 20 kilometres wide and over 80 kilometres long from Glenorchy in the south to Watchem in the north.

Extensive computer modelling and mapping a range of flood scenarios from minor through to extreme helped verify where floods had previously been, then measured and predicted future flows directions, depths and extents. Channel decommissioning for the Wimmera Mallee Pipeline Project along with urban drainage and flood impacts on rural properties were all considered during the investigation.

Wimmera CMA Floodplain Management Team Leader Paul Fennell said the meetings provided an important opportunity for people to hear recommendations and ask questions.

“We were really pleased with the number of people who came along, as the community has provided significant input towards the study and helped us gain a more practical understanding of flooding throughout the entire catchment. This understanding has helped us shape the recommended options.”

Mr Fennell said one significant and tangible outcome for the community was having a significant bank of flood intelligence to utilise in future floods. This would enable timely warnings and help with emergency response for future flood events.

“The flood mapping provides valuable information for planning purposes because there is now better knowledge about where it is likely to flood in a range of scenarios including potential inundation of houses, roads and infrastructure that may be at risk from flooding. From here we will prepare the final report which will help the various authorities in future planning and funding applications to complete the recommended mitigation works.”

Wimmera CMA has managed the project in partnership with GWMWater and Yarriambiack, Northern Grampians and Buloke shire councils. Water Technology, who has extensive experience in flood investigations, is the project consultant.

Community members who weren't able to attend the meetings can view the presentation slides and maps from the meetings below. 

The final reports will be available online in the coming weeks.

Final Community Meetings Presentation - March 2017

Dunmunkle Creek Flood Investigation Maps - March 2017