Refuerzo de césped
El principal desafío para los esquemas de protección contra inundaciones es a menudo mantener la cobertura de pasto en terraplenes y aliviaderos durante eventos de desbordamiento y aumento del nivel del agua. El césped es una buena solución de protección contra la erosión a corto plazo; sin embargo, sufre de áreas potencialmente débiles debido a la muerte o al crecimiento deficiente, lo que puede provocar lavado y erosión.
El suelo desnudo da lugar a la erosión del suelo por el viento, la lluvia y el agua y las precipitaciones más frecuentes e intensas aumentan el riesgo y el césped bien establecido sólo puede soportar flujos de 4.5 m/s durante hasta una hora. Además, con pendientes más pronunciadas existe el riesgo de deslizamientos de tierra donde los flujos subterráneos pueden provocar explosiones más abajo en la pendiente.
El control permanente de la erosión del refuerzo del césped consiste en mallas y redes que brindan protección inmediata al suelo desnudo durante la vida útil del proyecto, protegiendo el suelo incluso si la vegetación muere.
Terraplenes de inundaciones y aliviaderos de embalses
La probada estera de control de erosión Erosamat 3/20Z500M es adecuada para proyectos de terraplenes contra inundaciones que cumplan con este requisito. Erosamat Tipo 3 es una solución no biodegradable, con una vida útil prevista de 120 años. El TRM protege permanentemente el suelo en áreas sin césped y refuerza las raíces en áreas con césped para soportar velocidades de flujo de hasta 7 m/s.
Long Duration Field Trial
Following construction of the Aller Moor levels spillway, vegetation was not fully established before the winter of 2013/14. Subsequent prolonged heavy rainfall led to extensive flooding, where the new flood defence measures worked well – with no significant loss of soil due to erosion.
Independent data collected by Black and Veatch during the 62 day flood reported the spillway and TRM functioned as intended. This data demonstrated that unvegetated Erosamat Type 3/20Z 500M provided sufficient protection to the spillway for velocities exceeding 4 m/s over prolonged periods and fully vegetated Erosamat 3/20Z 500M provides protection for flow velocities of 7 m/s.
Unlike typical lab simulation results from short duration tests (10-50 hours), the Erosamat 3/20Z 500M performance parameters are demonstrated during active flood conditions, over an extremely long duration of 62 days. Erosamat is therefore a proven TRM system that provides a high level of protection for vegetation and the underlying soil during high flow/long duration events.
62 days of flow rate data following January 2014 floods
Flow depth and velocities were recorded on Aller Moor spillway during flooding on 23 January 2014.
Flood Management
Geotexan offer a number of products for the creation, repair and reinforcement of flood embankments, which act both as erosion protection against flood water and for flood water storage.
Webwall is a flexible geocellular retaining wall system, which provides green faced walls up to near vertical faces. Installation is quick and easy, with the added benefit of using site won materials as fill. Webwall can also be constructed as a Flood Bund, and provides a visually pleasing alternative to gabion baskets for Riverbank Restoration.
Erosaweb geocell is designed for the reinforcement of weak soils and has many applications, including retention of soils on steep slopes and erosion control. The perforated geocells retain the fill material, while allowing water through and reducing run-off velocity.
When used in conjunction with Erosamat and geogrids, Geotexan can provide a single solution for Flood Management systems, backed-up with design advice and support from our Technical Team.
Erosion Control
Geotexan offers a range of permanent and biodegradable Turf Reinforcement and Erosion Control Mats, from low cost soil cover to reinforced spillway protection systems, as well as permanent geocellular solutions.
Temporary erosion control is provided by Erosamat Type 1 range of jute matting. These mats offer approximately 18 months coverage, allowing for the establishment of vegetation whilst protecting the subsoil.
All Erosamat products are secured using biodegradable anchor pins, steel pins or helical pins, for which Pinning and Installation Guides are available.
The Erosaweb geocell contains topsoil onto steep slopes to stabilise embankments, enabling a natural grass finish to establish and providing a light-weight and low carbon alternative to wire mesh for veneer stability.
Erosaweb geocell GWX 200/300 for soil retention on steep slopes
The Erosaweb cells retain the topsoil fill whilst still allowing water to drain through. The large 4m x 6m GWX 200/300 panels have a cell size of 200mm deep x 300mm diameter and are simply stretched out into position down the slope before pinning into place.
Ponds, Swales & Lagoons
Water containment applications such as the creation of attenuation lagoons and swales (for SuDS applications) are facilitated with our range of geomembranes and GCLs. Geosynthetic lining systems such as GCL and HDPE are useful and long-lasting methods of forming ponds. Liners can be pre-fabricated to size before delivery, or welded on site to the required profile. Geosynthetics also contribute to the construction of efficient swales and conveyance channels, by providing resilient protection from damage caused by erosion. Where suitable, steep banks can be constructed using geosynthetics to increase plot size on housing developments.
Trench soakaway systems
Geotextiles have long been an integral element of soakaway systems, providing a vital treatment process as collected water is filtered through the fabric. They provide a separation function for granular stone layers and filter water within the drainage systems to reduce the environmental impact of construction. They are an important component in many applications, including in the construction of roads, car parks, embankments and wrapping SuDS Infiltration/Attenuation Tanks.
Our experience across many areas of infrastructure, means we can ensure you get the right product for your specific application. All our products come with design advice and technical guidance from our in house Chartered Civil Engineers.
Coastal Defences
Geotextile product options include a range of woven and non-woven polypropylene options to meet a variety of separation, filtration, reinforcement, protection and drainage design functions.Geotextiles are used in multiple applications, such as: under rock armour in Coastal Protection, beneath Pond Liners, French drain filters, sub base separation, embankment starter layers, basal reinforcement and ground stabilisation.
Filtration geotextiles are designed to be used as separators for hydraulic coastal and river defence structures. They are placed at lower permeability depths to prevent the escape of fine particles while permitting the free passage of water to provide a stable and consistent bedding layer, often replacing the need for rock armour. The fine pore size and high permeability properties make Geotesan NT an ideal choice for demanding filtration applications such as coastal engineering.
Typical Client Profile
- Environment Agencies
- Local Councils
- Drainage Engineers
- Coastal protection engineers
- Geo-environmental engineers
- Agricultural engineers
- Highways engineers
- Reservoir engineers
- Local Drainage boards
- Canal & River Trust
- Housing Developers
- Water & sewerage authorities