The river Vecht by Junne: development of an active river-system
1. The river De Vecht lies centrally in the province of Overijssel.
The river system is strongly regulated however and therefore limited
in it's functioning as an ecological linkage zone. On the north side
of De Vecht, between the Junner Koeland and the weir at Junne, the
forelands have been designated as a future nature area.
The resolving of ecological problems at particular points can be combined
with the restoration of the river system. Investigation will be necessary
into how the processes that are related to natural rivers, e.g. flooding,
sedimentary deposition and erosion, can once more play a role. Within
the framework of the TEN project a study will be carried out into
possibilities to restore, organise and manage a once active river
system.
2. Problems in the river system
The following problems present themselves in the river system:
a. Drainage
Drainage at De Vecht is too fast. The river is canalised and has a
deep profile with many shallower meanders which are cut off. The banks
have been stoned for the most part and the river is therefore not
ideal for spawning fish.
b. Fragmented nature areas
In the winter bed of De Vecht the nature areas are fairly isolated
from each other and relatively small. Due to the lack of wide, natural
banks the river cannot function as an ecological linkage area. c.
Agricultural land with low natural values
There is still a lot of farmland in the Vecht valley alternated with
various nature reserves. Due to intensive farming, nature can not
function well in the area. For many animals dependant on a river system
with more natural banks De Vecht system is not ideal, although it
functions reasonably well for fish.
3. Aims and expected results
This TEN sub-project is partly planning and partly construction. Communication
with all parties involved is of great importance. a. Planning Development
of a design that shows how the wet biotopes function as an ecological
linkage area and will encourage natural development and processes
in the small river system of De Vecht. Attention is also paid to the
future lay out and management.
b.A small test area as example A small part of the constructionplan
will be carried out e.g. the removal of sheet piling amongst other
things so that the riverwater kan stream more easily in and out of
the winter bed.
c. Communication between the authorities involved. The aim is to achieve
support for the implementationplan and to discuss the future management
of the area. Participants include the Dept. of Waterways and Public
Works, the district waterboard, State Forestry, local authorities,
farmers and local tourist operators.
4. The next phase When the strategy has been decided the actual
construction can begin. Subsequently, management should be such that
natural processes, necessary for the realisation of the objectives,
are activated. Grazing, as in the olden days, combined with the river
system, will determine the natural variety and richness of the area.