Dyke reinforcement Steurgat / Land van Altena and Bergsche Maas / Land van Altena Wherever river widening is impossible, additional dyke reinforcement work will be carried out. Along the Steurgat, between Hank and Werkendam, sections of the dyke will be improved.
Causes
Height
Primary river dykes along the Nederrijn and Lek do not meet the requirements set for these watercourses. Some sections of the dyke have to be improved to pass (regular) safety tests.
Solutions
Stability (piping)
Stability
Water seeps under the dyke (seepage), taking sand with it (piping). This weakens the dyke and will lead to breaches.
The dyke is too low. At high water, the river water flows over the dyke.
1. Dyke improvement in ground
2. Construction
3. Dyke improvement in ground
inwards
W
outwards
In principle, dyke reinforcement is carried out inwards. In case this is unfeasible due to i.e. a lack of space, alternative measures will be taken in the order set out right.
DORDRECHT
N
High water pressure is causing the top layer of the dyke to deteriorate. This weakens the dyke.
GORINCHEM
A16
a Wa
E S
dyke reinforcement with sheet piling
port of Werkendam
l
WERKENDAM
uw
e
M
er
port of Werkendam
w
ed
e
N3
N
ie
A27
Key to map: ‘text’
Steurgat
modified / new situation
seepage barrier
existing situation
Steurgat
dyke reinforcement motorway (provincial) road
National Park De Biesbosch
Planning
Effect
De Gijster
1 2 3 4
Project decision Preparation phase Start of work Delivering water safety
Berg
sche
Maa
s
Preventing flooding or breach of the dyke during exceptional high water. Scale:
www.roomfortheriver.nl
1
2
2011
2012
3 2013
2014
4
0
4 km
2015 Jan 2015 / 14-15