Case study:Sandscaping

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Location: 51° 59' 29", 4° 20' 22"
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Project overview

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Status Complete
Project web site http://www.therrc.co.uk//sites/default/files/files/riverwiki/65_sandengine.pdf
Themes Economic aspects, Flood risk management, Habitat and biodiversity, Monitoring, Social benefits
Country Netherlands
Main contact forename Jaap
Main contact surname Flikweert
Main contact user ID
Contact organisation Royal HaskoningDHV
Contact organisation web site http://www.royalhaskoningdhv.com/
Partner organisations Rijkswaterstaat, Province of Zuid-Holland, The Crown Estate, Van Oord, HR Wallingford, Arup
Parent multi-site project
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Project summary

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Sandscaping is an innovative coastal management approach, inspired by the Dutch Zandmotor (Sand Engine) (Photo 1 and Map 1)). It involves placing a large volume of sediment to benefit one location, designing it so that natural processes move the sediment to other places where it is needed. In the right place and if designed well, the large volume and concentrated placement can reduce costs, while the scale and dynamic nature can generate benefits for amenity, tourism and habitats. A partnership of organisations has been exploring the implementation of Sandscaping in the UK. There is a long list of high potential sites currently being developed with local partners (Map 2). The Dutch Zandmotor is a nourishment of 21.5 million m3, intended to last for 20 years. Monitoring over the first 5 years shows it is likely to function longer, up to 30 years. Economies of scale reduced the cost per m3 by about 50% from normal scale nourishments. In addition, the Zandmotor has become the most popular location for kite surfing in the Netherlands.

Monitoring surveys and results

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Lessons learnt

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Catchment and subcatchment



Site

Name
WFD water body codes
WFD (national) typology
WFD water body name
Pre-project morphology
Reference morphology
Desired post project morphology
Heavily modified water body
National/international site designation
Local/regional site designations
Protected species present
Invasive species present
Species of interest
Dominant hydrology
Dominant substrate
River corridor land use
Average bankfull channel width category
Average bankfull channel width (m)
Average bankfull channel depth category
Average bankfull channel depth (m)
Mean discharge category
Mean annual discharge (m3/s)
Average channel gradient category
Average channel gradient
Average unit stream power (W/m2)


Project background

Reach length directly affected (m)
Project started
Works started
Works completed
Project completed
Total cost category
Total cost (k€) £60m
"£" is not declared as a valid unit of measurement for this property.
Benefit to cost ratio
Funding sources Rijkswaterstaat, Province of Zuid-Holland

Cost for project phases

Phase cost category cost exact (k€) Lead organisation Contact forename Contact surname
Investigation and design
Stakeholder engagement and communication
Works and works supervision
Post-project management and maintenance
Monitoring



Reasons for river restoration

Mitigation of a pressure Flood and coastal erosion protection
Hydromorphology
Biology
Physico-chemical
Other reasons for the project


Measures

Structural measures
Bank/bed modifications
Floodplain / River corridor
Planform / Channel pattern
Other Sandscaping
Non-structural measures
Management interventions
Social measures (incl. engagement)
Other


Monitoring

Hydromorphological quality elements

Element When monitored Type of monitoring Control site used Result
Before measures After measures Qualitative Quantitative

Biological quality elements

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Physico-chemical quality elements

Element When monitored Type of monitoring Control site used Result
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Any other monitoring, e.g. social, economic

Element When monitored Type of monitoring Control site used Result
Before measures After measures Qualitative Quantitative


Monitoring documents



Additional documents and videos


Additional links and references

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Supplementary Information

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