The state governments proposal to raise the Warragamba Dam wall is back in the spotlight.
Wollondilly Council has made a submission to the NSW Upper House Inquiry into the proposal.
The council's report highlights the cultural significance of Aboriginal sites and European heritage in the Burragorang Valley as well as potential ecological impacts.
The area that would be inundated as a consequence of the proposed raising of the existing dam wall is located entirely within the Wollondilly region.
Council's environment manager Alexandra Stengl said the council has heard from the community about the feared loss of cultural heritage, the effects on biodiversity and the overall concerns about the impact on the Warragamba community and the management of such a large project.
"We are concerned that our national parks, cultural sites and world heritage areas may be significantly damaged as a result of raising the Warragamba Dam wall," she said.
"We have requested that significantly more time and resources be allocated to Aboriginal and early European heritage surveys as part of the dam raising Environmental Impact Statement."
Council's concerns about the ecological impacts focus on a number of endangered species and ecological communities within the inundation area.
The UNESCO World Heritage Committee has raised similar concerns about the extent and frequency of flooding associated with the raising of the dam.
The submission raises the need to consider the effect of the project on the Warragamba community.
Council had previously requested that an analysis and planning for the management of impacts on the town during the construction phase be undertaken, including the implications of truck movements on the narrow roads.
Council has requested to appear before the Select Committee that is inquiring into and reporting on the Government's proposal for the dam at a public hearing on November 20.
Wollondilly Council has joined forces with Blue Mountains Council to campaign on these issues and a joint community forum is planned for November 10.