Flood protection

The garden was designed by landscapers Michèle Orliac and Miquel Battle and realized for a cost of 3 million euros. This "new green lung", as presented by the City Hall of Toulouse, is part of a major urban project that provides for the creation of 500 housing units in the Niel District (Ref. 1). The project involved creating vegetation enmeshed benches (Ref. 7) and using permeable flooring materials that prevent water loss and reduce the potential of flooding (Ref. 8).

A number of studies were carried out since 1984 to determine a suitable flood prevention scheme for the White Cart Water and its tributary to provide protection up to the 1 in 200 years event (corresponding to protection up to 1 in 100 years event by 2050s, according to considered climate change projections). In 2002 the development of the scheme began with the help of consulting engineers. The resulting White Cart Water Flood Prevention Scheme, the largest flood protection scheme in Scotland, was published in November 2004 and approved by the Scottish Government in 2006 (Ref 1). Phases 1 and 2 of the White Cart Water Flood Prevention Scheme were completed by late 2011 as part of Glasgow City Council's strategy, working with other key stakeholders, to reduce flood risk to residents and businesses in the south side of Glasgow. In 2017, Glasgow City Council secured funding to enable the completion of the third and final phase of the scheme. This phase involves the construction of 9 sections of flood defence - a combination of flood defence walls and embankments which will provide direct flood defence along sections of both the White Cart Water and Auldhouse Burn. Through 2017 the project team has been finalising the design and undertaking surveys etc. The project is currently ongoing (Ref 3).

The historical canal that was disconnected by a road in the 1970s is currently being restored by the municipality, creating a lively atmosphere allowing for water recreation, a boulevard and green spaces (ref. 1). A small element of this restoration is the addition of green elements by a citizen group, which entails improving ecological, aesthetic and historical quality of the canal by implementing eco-friendly riverbanks, green connecting zones and floating vegetation islands (ref. 3,9,11,12).

Due to the challenges caused by climate change, Hamburg decided to become greener and developed a comprehensive, pioneering green roof strategy. The strategy aims at creating 100 hectares of new green walls by 2019 by providing grants for building owners for greening roofs and offering them rain water fee reduction owing to the rain water retention of the green roofs. (Reference 1) The financial support offered until the end of 2019 is 3 million EUR. (Reference 2) The services offered by the city in this plan consist of four pillars: promotion (financial incentive), dialogue, regulation, and scientific support. (Reference 7)

The project aimed to test the potential to use existing surface water drainage charge mechanisms to incentivize increased implementation of Sustainable Urban Drainage Schemes (SuDS) to improve flood resilience and improve water quality in the city of Manchester (ref 1). Working with partners from The Water Taskforce, and funded by the DEFRA (Department for Environment, Food & Rural Affairs, UK Env agency), BITC (Business in the Community) and CLASP, these partners have been testing the concept that implementing SuDS on a school site could generate savings for a school, by reducing their hard-standing area and so their charges from their water supplier. Working with two schools in Manchester, the project team carried out detailed audits and SuDS interventions were identified that could divert or slow the flow of water into the sewer system, or reduce the amount of chargeable hard-standing area. Using this information, a trial version of a simple, user-friendly tool has been developed to help schools identify if there may be a cost-effective way to drop a chargeable surface water band (ref. 2).

The city of Salford has experienced several floods and is at risk of flooding once every 100 years (Ref1). The majority of properties in the city that lie in a high-risk flood zone are in the floodplain of the Irwell. The UK's Environment Agency and the council, designed a flood prevention scheme which included temporary water storage areas which will store floodwater on the existing Castle Irwell playing fields and public open space, and double as sports area otherwise (Ref 5). It aimed to have its own wetland and wildlife habitat, and will help protect hundreds of homes and businesses (Ref 4).

Three London Plane trees were planted in a specially designed trench in Howard Street, Salford, Greater Manchester in 2015 with the aim of capturing the impact that trees had on both cleaning polluted water from road runoff and managing levels of surface water, which can lead to flooding when not properly managed (ref 1). This project in the City of Salford was created to study how trees can aid in the management of urban stormwater as a novel retrofitted street tree demonstration (ref 3). It was led by Manchester's City of Trees movement. (Ref 3)

The Environment Agency, Manchester City Council and the Irwell Rivers Trust had undertaken works to renaturalise a section of the River Medlock running through Manchester. The project had sought to return the river to its natural state by widening the channel and replacing the Victorian brick lining with gravel that provides a more natural-looking and fish-friendly section of the river and reduces flood risk at the same time (ref. 3). The project was also being seen as an EU exemplar of how to go about restoring an urban river (ref. 1, ref. 7).

The Revealing the Roch project uncovered two sections of the River Roch to expose a historic bridge which had been hidden for over 100 years (ref 1). Re-opening and deculverting the River Roch and bridge has a tangible benefit by reducing flood risk for the town (ref 4). The scheme, which is a key part of Rochdale town centre’s ongoing regeneration programme will help reduce flood risk in the town center and create educational opportunities. The project also includes enhancing the natural heritage of the river by introducing features that encourage river vegetation and creatures to re-establish themselves (ref 5). The project has since led to a wildlife boost, with brown trout, bullhead fish, heron and kingfishers all being seen since construction work to open the river began. (Ref 3). As the River Roch connects to River Mersey which empties into the North Atlantic ocean, this intervention addresses marine ecosystem restoration as well.

New Bolton Woods Ltd is a development partnership between the regeneration company Urbo and Bradford Council (ref5). This project aims to create a new sustainable urban neighbourhood, linked to the existing Bolton Woods. As the majority of the proposed development is situated on land which falls within Flood Zone, a range of measures including the raising of ground floor levels, and incorporation of sustainable drainage techniques will be used to manage runoff.
The project intends to provide a series of well landscaped, high-quality open areas and parks for the community. There is potential for a long term phased canal restoration (ref. 1). The second stage,145 houses are currently under construction on the slopes off Poplars Park Avenue, overlooking Canal Road, and are due to be completed by 2021 (ref 6). West Yorkshire Ecological Service raised concerns that the development would lead to a loss of woodland (ref 6).