Knowledge Hub: Understanding Peatlands

Peatlands are globally significant ecosystems for carbon storage, water management, and biodiversity. They cover around 20% of Ireland and extensive upland and lowland areas of the UK, meaning this region carries international responsibility for their protection and restoration.

This Knowledge Hub explains what peatlands are, the threats they face, and the reasons restoration matters. Along the way, we highlight how peatlands interact with infrastructure, flooding, and land use — because understanding these interactions is essential for successful projects.

What are Peatlands?

Peatlands form where waterlogged and oxygen depleted conditions slow plant decomposition, allowing organic matter — especially Sphagnum moss — to accumulate over thousands of years. Growth is extremely slow, typically 1 mm per year, so a 1 m layer of peat represents over a millennium of environmental history. Some intact bogs exceed 10 m in depth and are thousands of years old.

Globally, peatlands cover just 3% of the land surface but store more carbon than all forests combined. The UK and Ireland are internationally important, together holding about 23% of the world’s blanket bogs.

Why this matters for projects

Peat is not “just another soil”. Its high water content, compressibility, and instability present unique challenges for construction, drainage, and restoration. Understanding peat depth and condition is critical for risk assessment, spoil/peat management, and infrastructure design.

Threats to Peatlands

Peatlands are highly vulnerable to disturbance:

Drainage: lowers water tables, exposing peat to oxygen and releases stored carbon through respiration.
Peat extraction: for fuel or commercial use accelerates drainage and degradation.
Overgrazing: damages Sphagnum cover, leading to erosion of bare peat and reduces peatland infiltration capacity.
Climate change: more frequent droughts and intense rainfall events increase vulnerability to drying, erosion, flooding and wildfire.
Development pressures: infrastructure such as wind farms, access tracks, or forestry can alter hydrology and fragment habitats if not carefully designed.

Why this matters for projects

Changes in peatland condition don’t just affect the bog itself – they can also affect slope stability, downstream flooding, and groundwater behaviour. Poorly designed drainage, for example, may increase landslide risk or cause knock-on impacts to rivers and water supplies. Recognising these connections early in project planning reduces long-term risks and costs.

Why Restore Peatlands?

Restoring degraded peatlands is one of the most effective nature-based solutions to climate change. By rewetting peat, we can halt greenhouse gas emissions and reinstate long-term carbon storage.

Other benefits include:

Water quality improvement: peatlands act as natural filters, reducing sediment and pollutants.
Flood regulation: by storing and slowly releasing rainfall, peatlands reduce downstream flood peaks.
Biodiversity gains: peatlands are home to specialised plants, birds, and invertebrates.
Sustainable rural employment: restoration projects support jobs in conservation, monitoring, and eco-tourism.
Carbon finance: schemes like the UK Peatland Code allow verified carbon credits to be generated from restoration work.

Why this matters for projects

Peatland restoration isn’t only an ecological goal – it can be part of wider project delivery. For example, integrating restoration into infrastructure developments can offset impacts, provide access to funding, and demonstrate corporate climate commitments. In catchments, peatland restoration can form part of natural flood management strategies, reducing flood risk to downstream communities and infrastructure.

Policy and Guidance

Work on peatlands is tightly regulated. Key frameworks include:

Scotland’s NPF4: strong presumption against development on deep peat, with requirements for restoration and reuse where disturbance occurs.
National strategies (UK & Ireland): ambitious peatland restoration targets for climate and biodiversity.
Funding schemes: Peatland Action (Scotland) and the Peatlands Climate Action Scheme (Ireland) provide financial support.
Regulation: Environmental Impact Assessments are often required, with strict controls on protected bogs.
Peatland Code: UK framework for generating verified carbon credits through restoration.

Why this matters for projects

Understanding policy frameworks early avoids delays and provides opportunities to align projects with government climate and biodiversity strategies. This builds confidence with regulators and stakeholders and helps secure funding or consents.

Integrated Thinking

One of the biggest lessons we’ve learned is that peatlands can’t be treated in isolation. Their condition affects – and is affected by – drainage, spoil, hydrology, and infrastructure. The most successful projects are those that join the dots.

That might mean designing drainage with peat stability in mind. It might mean reusing spoil to block drains in a way that both restores habitat and reduces waste. It might mean understanding how raising water tables on a bog influences groundwater pathways or flood peaks downstream. Increasingly, it means seeing peatland restoration as part of wider catchment-scale natural flood management.

This joined-up approach is what turns peatland knowledge into project value: resilient infrastructure, smoother regulatory approvals, and landscapes that work for both people and nature.

Thinking about development or restoration in sensitive uplands?

By combining peatland science with practical engineering and regulatory insight, we help clients deliver projects that are compliant, resilient, and future-proof.