A demonstration water treatment train -- a scaled down version of what has been proposed for the city -- will also be displayed. As Christchurch has grown, the amount of impervious surface area such as roofs and car parks that channel water straight into the stormwater system has increased. The water treatment train will demonstrate how plants and substrates can be used to detain, filter and reduce the amount of stormwater and suspended contaminants that flow into the drains and waterways.

categories: environment
original source: YouTube