At Exo Environmental we invest in research and development in our own expertise and work collaboratively with a variety of specialist bodies, research institutions and working groups, in order to provide innovative solutions to our clients’ needs. Our work is underpinned by the PIANC philosophy of ‘Working with Nature’. This focuses our project objectives, taking a holistic, ecosystem-based approach to create win-win solutions rather than simply minimising ecological harm. We aim to balance economic, societal, environmental and engineering factors to optimise design with positive gains from project conception to completion and beyond.

GeoBlock™ Technology

GeoBlock Creation Image
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  • GeoBlock™ technology is used to create geo-engineered structures comprised of a base aggregate that is stabilised through one or a combination of physical, chemical or mechanical methods and can be used as an alternative to existing hard-engineering coastal defences (e.g. rock armour).
  • Exo Environmental is engaged in research into the suitability of using dredged sediment to produce various GeoProducts, dependent on the site-specific physio-chemical properties of the dredged sediments and optimisation of the binding method.
  • This innovative approach to dredged sediment, based on an underlying proven technology, has the potential to turn a waste material into a viable product with associated economic and environmental benefits.

Greening the Grey™

GeoBlocks in sea protection
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  • In recognition that ‘soft’ nature-based-solutions, such as coastal dunes, saltmarshes or eelgrass beds, are not suitable for every environment. Especially taking into account coastal squeeze and high energy environments. Exo has developed unique surface textures that support the ‘bio-colonisation’ of traditional grey infrastructure.
  • The research is part-funded by the Interreg 2seas project ‘Sustainable And Resilient Coastal Cities’, this involves a number of field trials that assess four unique surface textures to ascertain the abundance and diversity of organisms colonising these textures.
  • Greening the Grey is aimed at making hard infrastructure more environmentally friendly, to a point that granite or concrete rock armour, breakwaters and quay walls become a thriving habitat for a diverse range of organisms.


GeoBlock 3D printed surface textures
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Below you can find multiple products that Exo Environmental have produced. Hover over each one to see an image.

Coastal Protection

  • Rock Armour Blocks
  • Eco Essex Blocks
  • Piling Habitats

Wind Farm Protection

  • Eco-Reef Blocks


  • Oyster Spat Collectors
  • RSPB Bird Nests


USIF Text Logo-01
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  • Exo Environmental have recently started working on a new research and development (R&D) project, termed ‘3D spat collectors’, funded by CEFAS as part of the UK Seafood Innovation Fund which aims to promote and develop technologies and methods to reinvigorate aquaculture production within British maritime waters.
  • This new R&D project aims to work towards a viable innovation that reduces commercial risk to native flat oyster (Ostrea edulis) production, by using existing technology with new modifications to increase the efficiency of spat collection from bed reared oysters.  The project aims to develop, through research and trials, a unique 3D printed reusable mould, into which a mix of stabilised sediment is cast. The technology is based on Exo’s ‘GeoBlockTM’ technology and the use of clean dredged sediment will provide the base substrate, upon which the oysters will spat.

UEA Projects

uea university of east anglia logo
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  • In 2020, Exo Environmental will be working alongside UEA students within our Research and Development.
  • This will include our research into:
    • River Colne Sediment and nutrient inputs (GIS and SCIMAP)
    • River Colne Flood Prevention Measures (NBS – flood prevention)
    • River Colne and Hythe area regeneration (SWOT analysis)
    • Evaluation of textiles for coastal defence
    • Public perception of innovative coastal defence materials
    • Habitat regulations Assessment (HRA) for Blakeney and Cley River/channel works
    • Bird Islands
    • Changes in plant nutrient and carbon cycles
    • Public perception of managed realignment
    • Ecosystem benefits of transition to salt marshes
  • Not only will this aid Exo’s research significantly, but will also offer a great placement to students by supporting their degree work.

Eco-Reef Units - GTI

GTI and ERDF landscape exo PNG
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  • Exo Environmental is working with partners on studies involving the ecological enhancement of scour protection of wind turbine pylons & cable routes.
  • Studies involve the development of ‘Eco Reef Units’ that change traditional grey scour protection, in to green marine havens.
  • The studies are partly supported by “the New Anglia Growth Through Innovation Fund, which is part-funded by the European Regional Development Fund”

Geotextile bags

Salhouse, beneficial reuse
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  • Transport and disposal of dredged material is a significant cost of dredging projects, both economically through direct financial outlay and environmentally, due to COemissions and disruptions during transport and the impact of disposal on receptor sites.
  • Geotextile bags can be employed to address these issues in certain instances. By retaining dredged material within these structures, the material can be dewatered, stabilised and stored on site or beneficially reused. This reduces the need for costly transportation and minimises environmental impact in the disposal process.
  • Exo Environmental specialise in the use of geotextile bags as solutions to dredging project requirements, providing environmental benefits whilst maximising economic gains. Please see our Waterside Marina case study as an example.

Structures for Habitat Creation

Brushwood Faggots, brushwood fascines, polers
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  • The success of habitat creation and restoration projects in both freshwater and marine environments, is heavily dependent on being able to stabilise the newly deposited material. Consolidated sediment reduces the impact of erosion and provides a more suitable substrate for biological colonisation to occur, which in turn, further stabilises sediments and allows the generation of established habitats. Retaining structures can be used during the disposal process in order to facilitate this consolidation and settlement process.
  • At Exo Environmental, we are actively developing traditional methods whilst researching pioneering solutions in order to bring together our experience and knowledge of sediment and water management, to provide innovative and site-specific project design. This ranges from geo-block hard engineering in high energy environments, to hybrid systems comprised of locally sourced materials employed using both traditional and modern methods.


Geosynthetic Research in freshwater habitats Tim Foo photo
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Other research projects we've worked on include:

  • RSPB Beach Nesting Birds
  • Geosynthetic Fabrics in the Freshwater Environment
  • Geosynthetic Fabrics in the Marine Environment
  • EU Hemp in Bio-Engineering
  • Productive Dredging Depots
  • Micro plastics

If you have any queries at all, please don’t hesitate to get in contact with us: