Summary of potential effects of boating related infrastructure
Modification of habitats
Impacts on water quality
Impacts from land-side facilities
The magnitude of potential environmental impacts
caused by boating facilities developments depends on factors
such as the actual location of the development, the scale of
the scheme, construction methods and project design and implementation.
Modification of Habitats
Those marina developments that irreversibly
modify existing natural habitats are likely to cause the most
significant impacts. In particular, where land claim is part
of the development, the potential to modify the habitat is greater.
Dredging may induce turbidity and, depending
on the scale, may affect tidal regimes. In addition, deep dredging
may disturb large benthic communities on the water bed, although
evidence of long term impact is limited.
There is a trade off between maintaining adequate
flushing characteristics of marina basins by dredging and causing
increases in turbidity by the dredging operation.
Dredge spoil disposal can have impacts on species
and seabed communities through increased turbitity and smothering.
Impacts on Water Quality
Evidence suggests that water quality in a low
flushing marina basin can undergo a number of changes. In particular,
water temperature may increase, dissolved oxygen levels may
decrease, and there may be increases in certain pollutants such
as copper from antifouling paints.
Terrestrial and non-marine invertebrates, abundant
in sand dunes and salt marshes, are unlikely to be affected
by marina developments unless the construction involves significant
modification of their habitats through land claim.
Aquatic estuarine communities, including algae,
worms and molluscs, are greatly affected by the loss of estuarine
area through land claim and locked basins. This also has a detrimental
effect on fish and bird populations which feed on the organisms.
Impacts from Land Side Facilities
The impact of boating facilitiesí operations
is dependent to a large degree on the nature of the management
procedures on site.
A large variety of toxic chemicals and oils
and fuels are handled at boatyards and marinas. Poor management
of such materials has the potential to cause significant localised
impact on the marine environment.
The provision of adequate facilities for the
reception of various wastes, the adoption of run-off minimisation
strategies and effective general site management can all improve
the environmental performance of a facility