Bank protection (Dutch: beschoeiing) is a construction along the bank of a waterway — such as a ditch, canal, river, or pond — that prevents the bank from eroding or collapsing due to water movement, wave action, or applied loads. Bank protection structures are particularly common in the Netherlands and other low-lying countries with extensive networks of waterways, where protecting land from water has been a way of life for centuries.
Without bank protection, banks would gradually wash away, gardens and plots would shrink, and waterways would silt up with collapsed material. The technique of bank protection therefore has a centuries-old tradition in hydraulic engineering and remains essential infrastructure in areas with dense water networks.
Applications
Bank protection is used in a wide range of settings:
- Residential gardens — Along the waterside of back gardens that border a ditch or pond. Here, the bank protection prevents the garden from eroding away and provides a neat, straight waterfront edge.
- Municipal waterways — Along canals, waterways, and drainage channels in towns and cities, often maintained by water authorities or local councils as part of public infrastructure.
- Agricultural ditches — Along field and plot ditches in rural areas, where bank protection prevents valuable agricultural land from sliding into the ditch.
- Recreational areas — Along marinas, fishing ponds, and leisure lakes where public access and boat traffic increase the stress on the banks.
Materials
Bank protection structures are built from a variety of materials, depending on the situation and budget:
- Hardwood (azobe, tropical hardwood) — Very durable with a lifespan of 25 to 40 years. Commonly used in professional hydraulic engineering.
- Pressure-treated softwood — A more affordable alternative with a lifespan of 10 to 20 years. Popular with homeowners and for smaller application
Lifespans given in the article for the two timber options. s.
- Steel sheet piling — Used along larger waterways and under heavier loads. Offers a very long service life.
- Plastic (PE/PVC) — Maintenance-free and long-lasting, increasingly popular as an environmentally friendly alternative.
- Concrete elements — Used under heavy loading conditions, such as along canals with commercial shipping traffic.
Construction
A typical bank protection structure consists of vertical posts driven or pressed into the bank, with horizontal planks or boards behind them to retain the soil. A geotextile membrane is usually placed behind the planks to prevent fine soil particles from washing through the gaps while still allowing water drainage.
Related terms
- Sheet pile wall
- Retaining wall
- Quay wall
- Water authority
- Erosion
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