Conservation

In recent years, WWF-Hong Kong has scrutinized all proposed drainage works in ecologically sensitive streams to reduce and minimize impacts to stream biodiversity. Our expertise and advice has resulted in changes in attitudes and techniques to flood prevention, and environmental considerations have become a key element in drainage designs. Click here to view examples of environmentally-friendly approaches to stream protection.

Flood relief by-pass channel
To avoid construction works in the natural river section, a by-pass channel connects upstream to downstream. Under normal flow conditions, the streamflow will run through the original natural river section. When the streamflow increases due to heavy rains, excessive water can enter the by-pass channel to prevent flooding on the land.

Preserving natural streambed
Rather than concrete, natural materials can be used to provide the substrate for the widened stream and river channels.

Temporary holding tanks and translocation
Temporary holding tanks or translocation exercises for species of conservation interests may be necessary when construction work in streams threatens aquatic life. This can happen because the stream course may dry up and the habitats may be disturbed. These measures help the species avoid disturbance during the construction period, so they can return to the locations after the construction.