Sediment is any particulate matter which can be carried along by wind or water. Sedimentation occurs when this eroded material is deposited on land or into water bodies, such as lakes, streams and wetlands. The process is usually a result of landsliding, flooding, heavy rain or wind.

How Natural Hazards New Zealand can help:

Erosion and sedimentation control plans first begin with an assessment of the potential hazard and risk your region faces. For this, Natural Hazards New Zealand can undertake hazard vulnerability studies related to the erosion terrain, rainfall, slope angle, erosion process and severity, deposition data, the amount of slope in a given area, the amount of existing erosion protection, the amount of development near watercourses, and seasonal rainfall; in addition we can provide damage and loss assessment modelling; and economic impact studies.

When your region’s sedimentation/erosion hazard and risk has been assessed, we at the Natural Hazards New Zealand (NHNZ) cluster know that good land-use planning/watershed management (such as revegetation and irrigation programmes, and strict site development policies); and community awareness can significantly reduce sedimentation impacts. As you will see from our sediment hazard-related projects below, we’re already employed around the globe with this type of planning and preparedness, including several World Bank, Asia Development Bank, United Nations Development Programme, NZAid and AusAID-funded initiatives.

If your region does not have erosion and sedimentation control plans in place, or your plans need upgrading, we would like to help.

Click here to view some NHNZ sedimentation projects

Natural Hazards Inc. members and their key experts with experience on sedimentation:

GNS Science