Following the appraisal of difference options a preferred scheme was identified. The preferred scheme comprises flood defence walls and embankments, flood gates, flow control structures, drainage works and the replacement of the lock gates in the port.
Around 27km of flood defence walls and embankments will be built. These will vary in height along different sections of the river according to the specific flood risk in each area. In public and residential areas the walls will feature a variety of attractive stone or patterned concrete finishes and coping stones designed to complement the area. In some locations they will also feature large glass viewing panels allowing people views of the river helped, in places, by raised footpaths.
Improved drainage infrastructure, including new underground pumping stations will be constructed, to remove excess water emanating from the town in the event of heavy rains and/or inability of water to drain into the watercourses when river levels are high.
Diversion and protection of the many public utility services such as gas, water and telephone connections will be carried out to allow construction of the flood defences and ensure continuity of service at all times.
Details of the proposed works in each of the flood cells can be found below:
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Hover over the images below for a description of the main works proposed for each flood cell. When hovering, click on the text to load a map showing the flood defence locations. The defence locations on these maps are the same as those shown at Consultation Event No. 2. Revised updated plans are being developed and will be published when complete.
The following images indicate the likely scale and position of flood defences at key locations. The appearance of the defences e.g. whether they are brick or stone or a patterned concrete has not been determined at this stage hence the images simply depict the flood defences as either grey walls or green embankments.
The finish to the flood defences will vary depending on the location. This may vary from plain or patterned concrete to stone or brick cladding or grassed embankments. The images below illustrate some of the potential types of finishes that may be incorporated into the scheme.
In many flood risk areas, development of roads, footpaths and buildings has taken place right up to the very edge of the rivers. The position of existing buildings, roads and footpaths makes them vulnerable to flooding but also dictates the position and type of defences which can be built to protect homes, businesses and people.
Unfortunately, in some instances the only location new flood defences can be constructed is in place of existing trees . This means that some trees will have to be felled in order to accommodate the proposed flood defences. Further information on tree felling and tree planting can be found here.