They are favourable for invertebrates and small vertebrates, which are strongly linked to particular vegetation types and hardly use underpasses without plant cover.įrom an economic point of view, embankments are often preferred, especially where excess material from other parts of a development can be used. Viaducts are particularly valuable to preserve ecosystems. When a road or railway line crosses a valley or other area which lies slightly lower than the target level of the infrastructure, a low viaduct is an ecologically preferable alternative to an embankment. In these cases measures for wildlife only have to ensure that previously existing movement corridors of animals are preserved or enhanced. Valley bottoms are preferred routes for many animals, in particular when there is a watercourse present. In hilly areas a viaduct is a good technical solution to lead a road or railway from one side of a valley to the other. Passages for fish ( 7.3.6) and for amphibians ( 7.3.7) are described in separate sections.
#UNDERPASS DRAINAGE CHANNEL HOW TO#
Separate sections give recommendations on how to adapt underpasses ( 7.3.4) and culverts ( 7.3.5) built for other purposes to make them better suited as fauna passages. mammals from the size of foxes and badgers down to small mammals such as voles, shrews, reptiles or invertebrates ( 7.3.3). mammals from the size of moose and red deer to roe deer ( 7.3.2), and underpasses for small animals, i.e. For wildlife-specific underpasses a distinction is made between underpasses for large and medium-sized animals, i.e. This chapter starts with viaducts, which are usually not built specifically for wildlife, but which can provide large and suitable passages for wildlife. With only limited adaptations these can function as fauna passages. Many underpasses are built for other purposes, from culverts to allow the passage of water to underpasses designed to lead a forestry road under a motorway. Underpasses for wildlife include all types of fauna passage built as a connection under the level of the traffic.
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