Introduction

The aim of this guideline is to reduce the need for additional structures, or where structures are required, reduce the construction of foreshore structures which damage, destroy or remove foreshore and aquatic habitats (particularly mangroves, saltmarsh, seagrass, mudflats, wetlands, rock platforms and snags. The guideline also highlights the need for foreshore structures to allow for public access to the shoreline, avoid constricting of boating and other use of the waterway, and reduce impacts to the visual amenity of the estuary.

Foreshore structures such as wharves, jetties and boat ramps can have harmful effects on the health and diversity of aquatic and foreshore ecosystems by:

• The removal, fragmentation and damage to natural habitats;
• Blocking water circulation and currents;
• Changing the type of fish and other species due to changes in bed surfaces;
• Destroying banks and vegetation by increased boating activity, boat wash and propellers; and
• Breaking the connection between different habitats

When structures are designed correctly they can provide habitat for fish and other sea life by providing shelter, sleeping and refuge for young fish, and feeding sites particularly for animals and plants that can attach to the structure

What you need to know about the design of foreshore and in-stream structures

• Firstly assess whether a new foreshore structure is needed. It may be possible for adjoining properties to share existing foreshore structures. As part of this encourage minor additions, maintenance or modification activities to the existing structures to facilitate legal use for adjoining properties and include improvements to the habitat such as revegetation or installation of fish friendly devices
• If a new structure is required it needs to placed in such a way as to reduce the impact on the environment
  -  Locate the structure away from important or undisturbed natural habitat
  -  Avoid damage or change to the slope and shape of the banks and bed
  -  Provide for the rehabilitation or improvement of habitat adjacent to the structure
  -  Allow water circulation and tidal flushing
  -  Allow public access to the foreshores
  -  Ensure sufficient water depth at the location of the structure
  -  Avoid damage to heritage item
  -  Do not constrict or encroach into navigation channels
  -  Do not damage, destroy or remove natural vegetation such as mangroves, seagrass, saltmarsh or snags
• The design and materials used in your structure also need to minimise the impact on the environment
  -  Minimise the size of the structure
  -  Minimise disturbance during construction
  -  Minimise shading caused by the structure by utilising slats, grids, grates, mesh decking
  -  Include rehabilitation of habitats and fish-friendly features
  -  Select materials that are both durable, recyclable and enhance opportunities for habitat
  -  Use a variety of different surfaces, materials, slopes, spaces and shapes in the structure
  -  Use colours similar to the  natural setting
  -  Allow water flow and tidal regime by designing gaps at suitable intervals
  -  Allow for future sea level rise
  -  Avoid smooth surface materials that are difficult for plants and animals to live on
  -  Avoid reflective materials
  -  Avoid materials that have harmful chemicals that can pollute the water
  -  Avoid vertical walls

To access the full details of the Best Practice Guidelines click here

Further Reference

• Guidelines for controlled activities - In-stream Works - DWE
• Riparian lands and in-stream development - HNCMA
• Fisheries Guidelines for Fish Friendly Structures - Queensland Government
• Best Practice Guideline 4 - Foreshore and Creek Bank Stabilisation and Protection
• Best Practice Guideline 10 - Boating and Waterway Use