Erosion Control is the application of measures and materials that prevent or reduce the loss of soil and sediment caused by water, wind or ice. UK erosion control is most commonly required on watercourses, coastal frontages, highway cuttings and embankments, and around new development on sloping ground.
Where erosion occurs
Erosion occurs wherever the shear stress applied by water, wind or ice exceeds the soil’s resistance. In the UK, the highest-risk locations are watercourse outer bends, steep highway cuttings, dam crests, coastal cliff lines, and exposed slopes during the construction phase of new developments.
Climate change is intensifying erosion risk on multiple fronts: more frequent and intense rainfall, higher peak watercourse flows, and rising sea levels with stronger storm surges. The Climate Change Risk Assessment (CCRA3) identifies erosion of coastal and inland banks as a top-tier priority.
Erosion control methods
Selection depends on the cause of erosion, the design loading and the visual or ecological requirements:
- Rock armour — graded stone (typically d50 of 200–800 mm) for watercourses, coasts and channel linings. Sized using Pilarczyk or Hudson formulas.
- Gabions and mattresses — rock-filled wire baskets and flat mats for combined erosion control and minor retention.
- Erosion control mats — three-dimensional polymer mats with seed mixes for vegetation establishment.
- Geotextiles — filter fabric placed under rock or mats to prevent fines being washed out of underlying soil.
- Vegetation — grasses, deep-rooted shrubs and trees that bind the soil over the long term.
Design and regulatory context
Erosion control on watercourses uses standard hydraulic methodologies (Pilarczyk, Hudson) to determine the size of rock armour required for the design event. CIRIA C683 The Rock Manual is the primary UK reference. For coastal erosion, the Eurotop manual and the Beach Management Manual (CIRIA C685) apply.
Works in or near a watercourse normally require Environment Agency consent under the Environmental Permitting Regulations. Coastal works require a Marine Licence from the Marine Management Organisation. Strict ecological controls apply where protected species or designated sites are involved.
Related ViaCon solutions
ViaCon supplies gabions, gabion mattresses and the geotextiles needed for complete erosion control systems on watercourses, coastlines and embankments. See our geotechnical solutions range. Related glossary entries: gabion, geotextile, retaining wall and ground reinforcement.
Frequently asked questions about erosion control
What is erosion control?
Erosion control is the application of measures and materials that prevent or reduce the loss of soil and sediment caused by water, wind or ice. Common UK methods include rock armour, gabions, erosion control mats, geotextiles and vegetation, often combined as a layered system suited to the specific site conditions.
Which erosion control method is best?
It depends on site conditions. For low-energy watercourses, vegetated erosion mats often suffice. For higher flows, rock armour sized using Pilarczyk methodology is the workhorse solution. Where flow energy is very high or where retention is also needed, gabions and gabion mattresses outperform rock armour by combining erosion resistance with structural function.
Do erosion control works need consent?
Yes. Works in or near a watercourse normally require Environment Agency consent under the Environmental Permitting Regulations. Coastal works require a Marine Licence from the Marine Management Organisation. Strict additional controls apply where protected species or designated sites — SSSIs, SACs, SPAs — are involved.
How long do erosion control measures last?
Well-specified rock armour and gabions last 50–100+ years with appropriate sizing and material selection. Polymer erosion control mats provide mechanical protection for 25+ years and are intended to be overtaken by vegetation that delivers the long-term protective function. Maintenance frequency depends on site exposure and is set by the maintenance plan.
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