In 1421 a combination of a North Westerly storm, together with a spring
tide, caused the dykes surrounding the ‘Groote of Zuid Hollandsche
Waard’ (The Great or South Holland’s Polder) to break, resulting in
large-scale flooding of this once rich agricultural land. This disaster,
named after the patron saint of that fateful day, St. Elisabeth, caused
the loss of some 60,000 ha of rich and prosperous polder land. The sea
gained free access to this large area. This combination of sea tides and
river sedimentation created a new and unique natural area later to be
known as the Biesbosch.
The ensuing years and centuries following the St. Elisabeth flood, a
combination of natural and human influences have re-shaped the Biesbosch
giving it its now familiar form. Fisheries, aquaculture (bull-rushes,
reeds and extensive willow woods) together with numerous duck decoy
traps and reintroduction of agriculture by land reclamation, creation of
new waterways (Nieuwe Merwede, Bergsche Maas), creation of
reservoirs supplying clean water to Rotterdam, have, together with
natural processes over 6 centuries, all helped to shape this area and to
create the Biesbosch as we now know it.
After the serious flooding of 1953 an ambitious plan was carried out by
the Dutch government to prevent any further extensive flooding. This
work, known as the Delta Plan, involved the closing of the estuaries
from the sea. A series of dams and sluices effectively closed of the
arms of the sea radically altering the Biesbosch, changing it from a
brackish tidal estuary (with a tidal range of 2½ meters) into a fresh
water wetland (with a tidal range of ⅓ meter). This has resulted in the
development of a unique range of flora and fauna.
The Dordtse Biesbosch is just one area within a much larger National
Park, The Biesbosch.
As has happened in many other countries, increasing awareness of the
need to protect areas of natural beauty and diversity, has lead to the
creation of National Parks protected under law. The Biesbosch is one of
such areas, becoming an official National Park in 1994. Covering an area
of some 9,000 ha it is the largest National Park in The Netherlands. The
Biesbosch is split into separate geographical zones:-The Brabantse
Biesbosch, the Sliedrechtse Biesbosch and the Dordste Biesbosch. The
latter covers an area of some 1000 ha. The Biesbosch is a unique natural
area being one of the few remaining fresh water wetlands. Due to the
importance of the Biesbosch to wildlife habitation, especially breeding
birds, large parts of the Biesbosch are protected areas and are not open
to the public.
The Dordtse Natuur en Vogelwacht (The Dordtse Nature and
Bird Protection Society) is committed to the development of the Dordtse
Biesbosch and carries out research projects into both the fauna and
flora of the area. The following pages will give the reader an
impression of the unique and flourishing wetland that is the Dordtse
Biesbosch, together with a cultural and historical record of the events
that lead up to the creation of this varied landscape.