Maori wording

Erosion and Sediment

Did you know sediment is the biggest polluter of New Zealandís waterways?

To you, it might seem like a harmless bit of dirt, but when sediment gets into our waterways it can destroy entire ecosystems and increase the risk of flooding through the gradual build up of silt.

Any construction works taking place in or around water must have an erosion and sediment control plan in place to stop sediment leaving the site and ending up in the nearest waterway.

Make sure you identify any routes by which sediment could leave your site and know what measures you need to control it.

Check out our top tips below to find out what you can do to control erosion on your site. For more detailed information on environmental management on construction sites see this website: Builders Pocket Guide

Top Tips
  1. Minimise exposed areas:
    Avoid disturbing or exposing more soil than you need to. Cover and stabilise areas as soon as possible. For more information click here

  2. Install silt fences and earth bunds:
    A silt or sediment fence will act as a barrier to stop silt and sediment run-off from leaving a building site. A silt fence will only be effective if it is positioned and installed correctly. For more information on silt fences click here

  3. Divert clean water upstream away from your site:
    Diversion bunds should be formed to help divert clean stormwater around the works area to prevent run-off onto open or disturbed ground. For more information on diversion bunds click here

  4. Protect nearby stormwater drains by surrounding them with a sediment sock or sandbag:
    Sediment socks and sandbags will trap sediment but still allow water to flow through to prevent flooding. For more information click here