We asked the community to comment on our latest draft Silviculture (Forestry) Guideline between 5 June and 17 July 2012. The aim of the guideline is to restore soil moisture, groundwater levels and streamflow to approximately 70% of the levels experienced in the 1990s.
In the first decade, this is expected to produce an extra 7 billion litres of water to flow into the Wungong Dam, which is enough to supply over 26,000 households for one year.
Since 2005 when the trial commenced, continued reductions in rainfall have reduced groundwater levels to such a degree that the original proposal will no longer recover groundwater levels enough to impact streamflows. The draft guideline proposes a more intense level of thinning, over about 15% of the original trial area (referred to as Treatment Area 4) for the continuation of the project.
The draft guideline was informed by:
- Comprehensive streamflow monitoring and research
- Thinning trials in Chandler and Cobiac sub-catchments
- Hydrological process modelling
As a result of your feedback, we revised the draft Silviculture Guideline to include specific references to dieback, chemicals, burning, soil movement, erosion and compaction, and salinity.
Below you can read the revised draft Silviculture Guideline, Response to Public Submissions and the Streamflow and Groundwater Enhancement Report, which provides more information about the proposed guideline.
The revised draft guideline is currently with the Department of Environment and Conservation for consideration.
Draft Silviculture Guideline 4 – Revised September 2012
Response to Public Submissions
Streamflow and Groundwater Enhancement report
You can find out more about the Wungong Catchment Trial through our project newsletter, Wungong Whispers. In our last newsletter we reported on the draft Silviculture Guideline 4, Dr Robert Humphries provided a case study on the bio-physical environment and we discussed the cockatoo research that has been carried out as part of the trial.
Wungong Whispers - April 2012
Wungong Whispers - November 2011
Wungong Whispers - May 2011