Erosion Control 

Oil Protection Bund, Erosaweb, Great Island Power Station, County Wexford, Ireland

Project Information

Client:Scottish and Southern Energy (SSE)
Contractor:JN Bentley
Consultant:Balfour Beatty / Lining Technology
Product:Erosaweb Geocell GWX 150/200
Quantity:2,424m2
Benefits:- Rapid installation
- Protects membrane and retains soil
- Vegetation on steep slopes (45deg)


Project Description

The 460MW Great Island Combined-Cycle Gas Turbine (CCGT) power plant is located near Waterford Harbour in Great Island, County Wexford, Ireland. It replaces the 240MW fuel oil unit at the existing plant site. The gas turbine was fired-up and synchronised to the grid for the first time in September 2014, marking the completion of the construction. The project created more than 1,200 jobs during construction and will supply electricity to more than 500,000 homes.

At an investment of more than €330m, it is one of the biggest infrastructural projects in the country and is one of the cleanest and most reliable gas power plant in the country. As part of the upgrades to the site, the existing containment bunds surrounding the oil storage tanks were upgraded to higher safety levels in this highly environmentally sensitive environment.

The Challenge

The existing tank bottom had a concrete floor which ran half way up the slope of the containment bund. The design called for a sealed system in which a HDPE geomembrane was placed across the tank floor and right to the top of the tank slope to contain oil in the event of a spillage. The bund floor was to be finished with a 10mm single sized pebble and the side slopes were to be vegetated. The side slopes in some areas reached a 1:1 slope and it was necessary to provide a method for retaining the soil onto the HDPE membrane without damaging it. A system anchored from the crest with enough depth of soil to sustain plant growth was required.

The Solution

ABG Erosaweb geocellular retention system was selected. The HDPE membrane was placed and anchored at the top of the slope. ABG Abtex SG60P/60PL loop fabric woven reinforcing and protection geotextile was then laid into an additional anchor trench beyond the HDPE trench. Erosaweb geocell was secured in this trench and each panel expanded to its full size and attached using ABG Abfix Ties to each of the loop positions across the geotextile. The designed anchor trench was then carefully compacted with selected fill. Topsoil was then placed by excavator into the cells from the bottom working up the slope, after which it was seeded.

Erosaweb geocell for slope erosion control

ABG Erosaweb geocell GWX 150/200

The ABG Service

ABG’s Technical Department carried out calculations to assist with the selection of a suitable looped Abtex geotextile, loop and tie strengths and most importantly anchor trench configuration. All materials were supplied on pallets for easy deployment on site.

Contact ABG today to discuss your project specific requirements and discover how ABG past experience and innovative products can help on your erosion control project.

Erosaweb geocell erosion control system expanded down slopeErosaweb placed in anchor trench and expanded down slope
Existing bunds to be lined and extendedExisting bunds to be lined and extended
Erosaweb geocell anchored in place ready to receive topsoilErosaweb geocell anchored in place ready to receive


Erosaweb Geocell

Erosaweb geocell is designed for the reinforcement of weak soils and has many applications including retention of soils on steep slopes and highway and rail embankments. The cells of the geocell retain the fill material, while allowing water through.

more...

Erosaweb Geocell is a cellular confinement system
 

Products

Erosaweb Geocell

Erosaweb geocell is designed for the reinforcement of weak soils and has many applications including retention of soils on steep slopes and highway and rail embankments. The cells of the geocell retain the fill material, while allowing water through.

more...

Erosaweb Geocell is a cellular confinement system
 

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