Ina Konterman Rijkswaterstaat 25 Januari 2019 Hollandsche IJssel Which combinations of measures for flood protection Hollandsche IJssel are cost effective To analyze sets of measures for the flood protection of the Hollandsche IJssel and adapt the adaptation path of the Hollandsche IJss ID: 789171
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Slide1
Flood Protection Hollandsche IJssel
Ina KontermanRijkswaterstaat25 Januari 2019
Slide2Hollandsche IJssel Which (combinations of) measures for flood protection Hollandsche IJssel are cost effective?
Slide3To analyze sets of measures for the flood protection of the Hollandsche IJssel and adapt the adaptation path of the Hollandsche IJssel if useful
4 steps of our
study
System analysis
Hollandsche
IJsselStudy the possibilities of the Hollandsche IJssel Storm Surge BarrierAnalyse cost-effective sets of measures that can be taken (improvement of HIJ storm surge barrier, dikes, floodplains, waterlevel HIJ) and analyse external effects (ecology, shipping, etc.)
Formulate adaptation path for the
Hollandsche IJssel
Scope of
our
project
Slide41. System
Analysis
with
SPR
Framework
System analysis
Slide5Dike reinforcement Use of floodplainsImprovement of HIJ storm surge barrier
Decrease waterlevel HIJ..Focus on HIJ storm surge barrier and
waterlevel
HIJ
Possible
measures
flood
reduction
Hollandsche IJssel
Slide61.
Reduction
of the failure rate of the SSB
Hollandsche
IJssel
1: 500, 1: 1000 and 1: 5000 per closure through all types of measures (back up of energy supply, emergency operation better designed, etc.).
Final
draft on
possible
options
discussed
in
February
2019
Slide72.
Closing
the barrier at low tide at the point of reversing current instead of just before high water
Measure
is
very
effective
,
little
negative
impact on
shipping
and road traffic
Slide83.
Limit
the volume of water that enters the
Hollandsche
IJssel from the regional system as much as possible during critical conditions
Approach
for
this
study
is ready
and
will
be
discussed
in
February
Slide9Impact of these
measures
on
the
waterlevel
Reproduction of results with a better hydraulic model just finished
Slide10Impact of these
measures
on
the
waterlevel
Reproduction of results with a better hydraulic model just finished
Slide11First indications
Preliminary cost assessment of measures SSB HIJK bij RWS Cost
Pool
What
is on
the agenda for the RWS Cost Pool: refine cost assessments (also operational
costs) and cost assessments for
measures
regarding the
regional
water system
Cost
assessment of
measures
Slide12First indications
Preliminary cost assessment of measures SSB HIJK bij RWS Cost
Pool
What
is on
the agenda for the RWS Cost Pool: refine cost assessments (also operational
costs) and cost assessments for
measures
regarding the
regional
water system
Cost
assessment of
measures
Investment costs improving SSB HIJK until 1:5000
10 million Euro
Savings in investments for dike reinforcements due to improvements SSB HIJ
50 million Euro
Reduction
of
damage
through
flooding
More
than
a
billion
Euro
Slide13Take existing floodplains
into account to calculate the
strength
of
the
dikes is very cost effective In cases of abundant rain, filling up the regional watersystem, it is very useful to close the barrier at low tide at the point of reversing
current instead
of just before high water.Investments in a
better
Storm
Surge Barrier HIJ seems
to
be
cost effective, independent of the size of improvements!The study about the regional water system is complex and still
needs a lot of attention
Current
status /
preliminary
conclusions
Slide144 steps of our
studyS
ystem
analysis
Hollandsche
IJsselStudy the possibilities of the Hollandsche IJssel Storm Surge Barrier
Analyse
cost-effective sets of measures that can be taken (improvement of HIJ storm surge barrier, dikes, floodplains,
waterlevel
HIJ) and
analyse
external effects (ecology, shipping, etc.)
Formulate
adaptation path for the Hollandsche IJssel
Focus of
the
work
2019
Slide15Slide16Scope: To find an optimum on cost-effective sets of measures for the flood protection of the Hollandsche IJssel and adapt the adaptation path of the Hollandsche IJssel if useful
Update the system analysis Hollandsche IJssel
Study the possibilities of the Hollandsche IJssel Storm Surge Barrier
Analyse
cost-effective sets of measures that can be taken (improvement of HIJ storm surge barrier, dikes, floodplains,
waterlevel HIJ) and analyse external effects (ecology, shipping, etc.) Formulate adaptation path for the Hollandsche IJssel
2.
Selection
,
scoping
&
exploration
–
define
the scope of
the
study