Lake Conjola Bank Stabilisation

⁠⁠⁠The proposed activity is foreshore protection and enhancement works along the Lake Conjola foreshore in the vicinity of the Holiday Haven Tourist Park and adjacent public reserve being Lots 486 and 487 DP 861543 (Figure 1 and Figure 2 below).

The proposed activity would involve the following works (refer to Appendix A for plans and Section 1.2 of this REF for more details):

• Removal of the existing concrete reinforcement along the edge of the foreshore and replacing with and supplementing the existing rock beaching with new, additional graded angular quarry rock.

• Revegetation and establishment of endemic saltmarsh, sedges and grasses along the shore and foreshore.

• Planting and maintaining native trees and shrubs along the top of the foreshore bank.

• Protection of revegetated areas with temporary fencing in the short-term and, once established, with bollard fence.

• Creation of rock fillet and benched area for the establishment of saltmarsh.

• Relocation and formalisation of waterway access.

• Replacement of concrete stormwater outfalls with vegetated swales

Fencing and vegetation management

Management of vegetation along the foreshore is recommended to help control pedestrian traffic and to provide second line of foreshore protection beyond the rock beaching. Vegetation management is widely considered the most cost-effective form of long-term erosion control. At Lake Conjola, management of vegetation will have to account for competing objectives of erosion control and push back from local residents and caravan park users. It is likely certain stakeholders will perceive foreshore vegetation as obstructing views and access to the water. As such, revegetation efforts should focus on low height grass and shrub species. Given the existing foreshore bank height is approximately one metre, plants that grow to a similar height should provide effect erosion control.

The primary intent of the fencing is to delineate a no mow zone along the foreshore to ensure a vegetated buffer is maintained. The fence would not need to be high, no more than 300mm, and may be formed by posts and chain or simply regularly spaced bollards. Possible material for the posts may be hardwood, concrete or recycled plastic.

Vegetated swale / stormwater outlet

A vegetated swale is a shallow, open channel designed to convey stormwater overland while also filtering pollutants and reducing runoff velocity. Unlike the existing concrete drainage systems, vegetated swales use grass, shrubs, and other vegetation to slow down water flow, allowing sediments and contaminants to settle before reaching the lake. The outlets may contain pit drains that will allow easy maintenance. This would be approximately 0.8 x 0.8 x 0.8m inline pit with metal grate that one person can clean out without specialised equipment.

• Supplement revetment wall with new graded angular quarry rock.

PRE-TENDER MEETING:

A mandatory site meeting will be held on Thursday 23rd October 2025. Please see the Request for Tender document for further details.