Flood protection

Zorrotzaurre is an artificial peninsula located within the Deusto district of Bilbao, Spain. It was formed during the 1950s and the 1960s, when a canal was built to facilitate navigation in the estuary of Bilbao. The Zorrotzaurre project is the latest major urban renewal project to commence in Bilbao. It is an integral and sustainable plan that recuperates a currently derelict site to convert it into a new quarter, and which also includes a flood protection system with water tanks to retain water and a flood protection barrier (Ref 1)

Following an extreme flood event on August 9th 2008 in Glendhu Park, eight houses experienced flooding and many more came within inches of being flooded. Two swales were constructed by Dublin City Council to provide surface water storage to ensure that no flooding will recur in a similar 100-year pluvial event. The swales are designed to self-drain back into the existing surface water sewer system following a severe storm event (Ref. 1).

Milton Common is the second stage of the multi-million-pound Flooding and Coastal Erosion Risk Management scheme being developed across the north of Portsea Island, from Mountbatten Centre round to Milton Common. The overall project will reduce the risk of coastal flooding and erosion and provide the critical infrastructure the city will need over the next 100 years (6).
As the second phase, Milton Common included the instalment of a new rock revetment as a plans defence, the creation of a coastal path and three new earth bunds with new footpaths (6). The work has also included the demolition of Great Salterns Quay and restoration of the natural mudflat habitat (2,4).
The fully completed scheme will significantly reduce the risk of coastal flooding to Milton Common and the local area over the next 100 years; it will offer protection against a 1 in 500-year flood event providing one of the highest standards of flood protection in the UK outside of London (6).

Portsmouth and its surrounding areas are under ‘serious water stress’ and water companies are being asked to take less water from some of their sources. This includes reductions to the amount of water that Southern Water can take from the rivers Test and Itchen in Hampshire. To address this, Portsmouth Water started the planning of a new Havant Thicket Reservoir.
The water to be stored in the reservoir will be supplied from surplus winter yield from the Havant & Bedhampton Springs. In winter, higher rainfall leads to a higher springs yield which flows into the sea, but a portion would now be pumped to the new reservoir. Long-term benefits of the proposed reservoir include enhancing the local environment and providing a new wetland habitat. (1,5)
In November 2020, the Havant Thicket Reservoir planning applications have been submitted to Havant Borough Council and East Hampshire District Council for validation. (7)

The city of Bydgoszcz modernizes the rain drainage system with the support of EU funds. The current badly functioning rain drainage system (with sanded and littered canals) prevents from unobstructed rainwater flow to the Brda and Vistula Rivers or the Bydgoszcz Canal. This in turn leads to frequent floods in the city. The project is planned for the period between 2017 and 2021 and involves water purification and management of rainwater in the grey and green urban areas as well as reuse of the collected water for watering urban greenery [1,2].

The Dee Park Regeneration Project aims to rebuild the 1,100 homes from the 1960s-built estate, that has been worked on in close consultation with the community. The estate is one of the 20 per cent most deprived areas in the country. The vision for the regeneration project is to create “a safe, inclusive and sustainable community, economically, environmentally and socially, as part of the wider Reading, where people want to live and work, and which will inspire a sense of pride”. The third and final phase of the project is ongoing and is expected to be completed soon. (Ref. 1, 4, 8, 9)

Pegnitztal West is a new corridor and recreation zone along a section of the Pegnitz river in Nurnberg suitable for all kinds of social groups and intended for recreational activities (1). The project instrumentalizes green and blue infrastructure for creating conditions for sport, leisure, and recreation, as well as serving a transitional function for the dwellers of the neighboring Gostenhof and St. Johannis districts (1). The green corridor also provides a protected urban habitat for various species, including more than 8 different tree species, water bats, green woodpeckers and swamp warblers. The project also stabilized the water level of the river and helps flood protection efforts. (2, 7)

Following a severe storm in 2000 that overwhelmed the sewage system of Portsmouth along with its main Wastewater Pump Station, causing major flooding in the city with the destruction of private and public properties, prevention of such events become a key priority (5).
The Portsmouth Flood Alleviation Scheme aims to relieve the pressure on the sewage system in wet weathers by diverting the accumulated surface water flows away from the combined sewer networks and discharge them into the harbours around the island (5). The Scheme consists of several measures across the city, among others the creation of a new open watercourse channel across the Great Salterns Golf Course diverting surface water directly into Great Salterns Lake (5). This measure of the scheme is a solution that separates surface water to provide resilience, boost flood protection and benefit the environment with the minimum of new infrastructure (1).

New recreation zone "Norikus Bay" in Nurenberg was completed in 2018 on the south bank of the Wöhrder lake, an artificial lake created in 1968 to protect the city from flooding. The dam itself, which is a 400m long path separating a part of the water surface from the bigger part of the lake, has become a tourist attraction with a water playground and other recreational amenities being offered. The water is naturally cleaned through the regeneration zone with natural plant filter, and simultaneously improves the habitat of fish and makes recreational swimming in possible in the cleaner water. New green areas are organized on the shore in order to improve environmental, aesthetic and recreational conditions of the area (1, 7, 8).

View Island in Reading is a relaxing island with natural open space with grassy paths and seating near to the weir at Caversham Lock. A conservation project has been carried out to e.g. improve water flow, improve biodiversity, and improve the entrance to and around the island. The work has been carried out in consultation with Reading Borough Council, the Environment Agency and has been designed and constructed by Riverworks Ltd. (Ref, 1, 2, 3)