IHE, NZV, EcoShape

September 9th, 2016 – partnermeeting Malmö

Up-Scaling of Building with Nature (WP 5 and WP6)

- THE TWIN DIKE CONCEPT

- QUIZ

- SUCCES FACTORS TWIN DIKE

- MOVING FORWARD

- GET INVOLVED

The coming hour?

- PHYSICAL SYSTEM

- SOCIETAL SYSTEM

- INSTITUTIONAL SETTING

- POTENTIAL BENEFITS

TWIN DYKE CONCEPT

Traditional solution

€ 25,5 million€ 11,1 millionHiring area in between•Temporal water storage•Cockels and saltvegetable growth•Catching sediment

€ 2,8 million(normal rent)

€ 4,4 million

Totally: € 18,3 million!Savings € 7 million

Twin dike solutionExcavate clay for reinforcement surface protection layerAnd construction of inland twin dike

inland Slicks - cockels seaside

Physical system

1. Tidal area, inland earth dike,

softer change in gradients

2. Inward surface level approx.-0.5

mNAP, tide: + 1,4 and – 1,8 m

NAP, sea level rise 25 cm until

2045

3. Storm surges of 45 h, waves up

to 6,5 m +NAPLandside dike dimensions: elevation4 m+NAP, slopes 1:3, grass on claycover, 3 m wide inspection road on top, reinforcements both sides 3 m wide at + 2 m NAP

Seaside dike dimensions +8m NAP elevation, 1:3 slope, outer lining to+3.5 m NAP, inward reinforcement10 m wide with inspectionroad,altitude+3m, top water discharge 55 l/s/m ; 2,7 km length

Societal system

Institutional system

Potential benefits

- Water safety

- Quick reinforcement procedures

- Economic diversification

- Increased value production

- Cheaper clay construction

material

- Enhanced conditions for N2000

- Refuge-areas for birds

- Feeding areas for birds

- Lower costs from € 25 to € 18

million

- Revenu from economic growth

……………. behind the fence it is all sunshine

Let’s play a game!

A Twin Dike in your area

Kahoot.it

…… how are we proceeding in crossing the fence ?

The pie riddle

1. One “piece of cake” → “water

safety”

2. Inventarising other pieces of cake

which could be combined : framing

as “win-win”

3. Make the pie bigger & imagine

the entire pie

.. or, in our case

Your pie is bigger, now:

4. Grow enthousiasm & dedication

with your stakeholders

5. Find sources of finance

6. Figure out the conditions

7. Cut the pie so everyone can enjoy

INCENTIVES and Committmentamong decisionmakers

High Level Goals :

- Delta Programme : National Policy lines

Commisioner – Minister/Secretaryinteraction

- Momentum of first examples multi-approach

- First image of lower costs : two pilot concepts

Regional Level : increasing mutualdependancy

- Step by step approach aboutcommittment : Letter of mutual interest to investigate

Letter of intent to realise and createpermits

Perspectives of being applicable elsewhere

Red coloured areas : 45 km

In South-west Netherlands : additionally 55 km. Savings € 100-300 million

Moving forward with up-scaling in the coming 6 months

Scotland

1Natural Catchment Pilot

The Eddleston Water catchment

Belgium

2Natural Catchment Pilot

Kleine Nete River catchment

The Netherlands

3Coastal Pilot

The sand motor (Delfland)

4Coastal Pilot

Hondbossche & Pettemer Sea defence

5Coastal Pilot

Houtrib dyke

6

DK-DE-NL Project

Coastal Pilot

Ameland tidal inlet monitoring and analysis – “Balancing Sediment

Deficits in the Wadden Sea”

Germany

7

Coastal Pilot

Niedersachsen: sediment supply at the Islands of Norderney and

Langeoog

8

DK-DE-NL Project

Coastal Pilot

Schleswig-Holstein: Coastal risk management – “Balancing Sediment

Deficits in the Wadden Sea”

Denmark

9Coastal Pilot

Coast between Thyborøn and Nymindegab

Sweden

10

Coastal & Natural Catchment Pilot

Lanstyrelsen Skane: protecting coasts, streams and wetlands

10 - SwedenCoastal and Natural Catchment Pilot: The Lanstyrelsen Skane: protecting coasts, streams and wetlands (WP3.7 and

WP4.4)

Location: catchment area of Råån, Helsingborg area, Skane

Main goals:

Protection and restoration of river and marine habitats for counteracting erosion and flooding:

o River:

• studies about effects of constructed measures (two stage ditches, wetlands) compared to channelized streams → monitoring of

biological structures, biodiversity, hydrological functions

• methodology to identify flood risk prone locations

o Coastal:

• studies on the role of eelgrass meadows to reduce beach erosion

• studies on planned retreat

• coast management guidelines

Stakeholders involved:

National (e.g. Swedish Agency for Marine and Water management, Swedish Environmental Protection Agency, etc.), Regional (Skåne

Region government), Local (municipalities, NGOs)

References:

Pär Persson - Water strategist, Department of spatial planning, County board (Länsstyrelsen) of Skåne

Survey, interviews

1. Overview

2. Performance

3. Reasons and rationale of the choice

4. Challenges, evaluation and up-scaling

5. “Resilient Capabilities”

Next steps – using and improving guideline for exploring

up-scaling

▪ Contract EcoShape WP 5 team

▪ Analyze Twin Dike project

▪ Detailing AP Up-Scaling

▪ Improve, generalize guideline

▪ Involve WP3 and WP4

Let’s get ready for a final poll

Kahoot.it