Front cover image for Reducing the impact of road crossings on aquatic habitat in coastal waterways - Hunter / report to the New South Wales Environment Trust

Reducing the impact of road crossings on aquatic habitat in coastal waterways - Hunter / report to the New South Wales Environment Trust

"Stream connectivity and habitat diversity are critical components of healthy rivers. Many fish have evolved to be reliant on a variety of different habitat types throughout their life cycle. The free passage of fish within rivers and streams and between estuarine and freshwater environments is a critical aspect of aquatic ecology in coastal NSW. Waterway crossings can affect the health of aquatic habitat and fish populations in several ways. Structures such as causeways, pipes and culverts, can prevent fish passage by creating a physical blockage, a hydrological barrier, or by forming artificial conditions that act as behavioural barriers to fish. Road crossings have also been linked to increases in sediment and other inputs from adjacent floodplains and slopes. Furthermore, some structures can adversely affect fish by altering natural flow patterns, disrupting localised erosion and sedimentation processes, and affecting instream habitat condition ... Fieldwork in the Hunter/Central Rivers region included assessment of over 2,100 waterway crossings ..."--Page 1
Print Book, English, ©2006
NSW Dept. of Primary Industries, Flemington, N.S.W., ©2006