Constructed Wetland Design for Water Quality Improvement at Silverstream Confluence

We seek an experienced specialist, or team of specialists, to design a constructed wetland, that will attenuate nutrients, E.Coli and sediment, and improve biodiversity and mahinga kai values, upstream of the confluence of the Silverstream with the Waikirikiri/Selwyn River near Coes Ford.

The Coes Ford Wetland Working Group is made up of representatives from Te Taumutu Runanga, local landowners, Selwyn District Council, Selwyn Waihora Zone Committee, Water Wildlife Habitat Trust, Industry, and Environment Canterbury. The Group has been meeting since 2019 to progress the construction of a wetland to improve the water quality of Silverstream before it joins the Waikirikiri/Selwyn River.

Coes Ford is a popular swimming, picnicking, and camping area. At times during the summer the water quality is below standards set for swimming. Silverstream, a spring fed catchment, is the primary contributor of contaminants to the Waikirikiri/Selwyn River at Coes Ford. Environment Canterbury has been working with landowners in the Catchment for over 10 years.

The streams are fenced as are the majority of the smaller waterways/drains. Farming Land Use consents are held by the major landowners with successful audits achieved. We will be attaching drone footage of the site as soon as it is to hand.