Lake Ainsworth

Lake Ainsworth is an important recreational and environmental asset and remains a key visitor destination in the Ballina Shire.

Lake Ainsworth is categorised as a typical acidic freshwater coastal dune lake and covers an area of 12.4 hectares. It’s managed by NSW Crown Lands and the southern end reserve is managed by Ballina Shire Council.

Lake Ainsworth Coastal Management Program (CMP)

2018 - 2020 
Objective To design and deliver a holistic plan of management for Lake Ainsworth in line with the NSW coastal management framework
Funding $183,000 funded by the NSW Dept of Planning and Environment (DPE) Coastal and Estuary Grants Program and Council

In 2018 Council engaged Hydrosphere Consulting to prepare a CMP to provide a long-term strategy and management actions for Lake Ainsworth. The CMP was prepared in accordance with the NSW Coastal Management Act 2016 and the NSW Coastal Management Manual and was one of the first CMPs to be certified in NSW. The Lake Ainsworth CMP contains 29 actions in total which are to be carried out within a ten-year timeframe. These actions cover various management issues including:

  • Water quality
  • Sediment management
  • Bank erosion
  • Catchment management
  • Cultural heritage
  • Flooding
  • Flora and Fauna
  • Community uses
  • Education

Action 1 – Trial modifications to artificial aeration

Jan 2022 - mid 2023 

Objective To determine the best aerator regime for the lake to improve water quality and reduce the incidence of blue-green algae
Funding $125,000 funded 2:1 by NSW Dept of Planning and Environment (DPE) Coastal and Estuary Grants Program and Council 

This project is designed as a trial over a two-year period to test the effects of modifying the current aeration program on lake water quality and specifically the incidence of blue-green algae blooms. The following modifications are being undertaken in the trial:

Phase 1 aerator trial – to be undertaken during 2022

  • Step 1. Design a monitoring program to assess the effectiveness of modifications to the current aerator regime.
  • Step 2. Trial a Spring/Summer aeration program with continuous aeration (24 hour operation as opposed to the current 12 hour operation period) while monitoring conditions.
  • Step 3. Reporting and analysis of monitoring data collected and provision of recommendations for Phase 2 in relation to the results of the trial. If the trial shows positive results to water quality, the aerator regime of 24 hour operation will be mimicked in Phase 2 to account for any variation in the seasonal data collected. If the Phase 1 trial shows a reduction in water quality, the Phase 2 monitoring program will be carried out with aerators switched off to determine if aerator operation is having a negative impact on lake water quality.

Phase 2 aerator trial – to be undertaken during 2023

  • Step 1. Aerators to be operated 24 hours per day over the Spring/Summer season (if Phase 1 trial showed improvements to water quality). If the Phase 1 trial showed a reduction in water quality, the aerators will be switched off over the Spring/Summer period while monitoring conditions.
  • Step 2. Reporting and analysis of monitoring data collected.
  • Step 3. Provision of a final report with recommendations for future management of the aerator regime in the lake, based on the results of the data collection and analysis.

Actions 3 and 10 – Beach nourishment and erosion protection

March 2022 - late 2024 

Objective To stabilise bank erosion and riparian vegetation and improve public safety and amenity of the foreshore
Funding $250,000 funded by the NSW government’s Crown Reserves Improvement Fund (CRIF)

Council was successful in obtaining grant funding under the Crown Reserves Improvement Fund (CRIF) to undertake works surrounding the lake in areas that have been heavily eroded through natural factors and human use. Eroding banks and exposed tree roots are creating uneven footing with trip hazards and causing damage to tree health and bank stability.

The project aims to take the following approach:

  • Carry out beach nourishment through the placement of sand along priority foreshores to address the loss of beach areas.
  • Establish a beach retention sill where required to stabilise steeper beach gradients. This will consist of a row of large sandbags installed underwater to act as a retaining sill to reduce the downslope loss of sand.
  • Backfilling of tree roots. This measure is an extension of the beach nourishment and will re-establish soil levels over tree roots that have been exposed due to continued erosion.
  • Riparian vegetation, fencing, and access management. This measure is part of a continuing strategy to ensure that vegetation around the lake is healthy and resilient, and the foreshore is managed to reduce human impacts that cause erosion.
  • Stormwater management will be addressed and will be vital in ensuring foreshore erosion is minimised.

Actions 4, 9 and 22 – Riparian vegetation enhancement for erosion control and educational signage

March 2022 - late 2024 

Objective To stabilise bank erosion and riparian vegetation, improve public safety and amenity of the foreshore and provide educational resources on the values of Lake Ainsworth
Funding $96,500 funded 2:1 by NSW Dept of Planning and Environment (DPE) Coastal and Estuary Grants Program and Council.

This project has been slightly amended in response to the impacts of the severe weather and flooding experienced in the Ballina Shire in early 2022 leading to the lake levels being higher than normal and access to riparian area being inaccessible. This project will begin with rehabilitation of the dune areas at the Eastern side of the lake. Once water levels have receded this project will follow woks outlined in Action 3 of the CMP with the Southern and Eastern foreshore rehabilitated and revegetated in a way that offers greater erosion protection while managing adequate access for the community.

Issues to be addressed:

  • Foreshore erosion of the lake
  • Foreshore accessibility and public safety
  • Stormwater impact
  • Poor riparian vegetation condition
  • Terrestrial weeds
  • Decreased amenity and enjoyment
  • Reduced aesthetic quality of the foreshore
  • Educational resources to foster understanding, respect and stewardship for the Lake.

 


Resources

The water quality snapshots below have been used to facilitate the preparation of the Lake Ainsworth Coastal Management Program.

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The General Manager
Ballina Shire Council
PO Box 450
Ballina NSW 2478

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