Extensive Green Roof: depth 3 - 5 inches; plants: Mosses, Sedums, Succulents, Herbs and few Grasses; Low maintenance and costs

One of the largest green roof building sites in Switzerland, the new dispatch building at Kloten International Airport is Dock E. Previously known as Dock Midfield the building is situated between take-off runways and landing strips. The roof is sporting an extensive green roof measuring 4,000 m2 (43,056 sf). Dock Midfield represents a perfect example how green space can be regained on roofs. Completed in November 2002 after years of detailed discussions, the planning group decided to install ZinCo green roof systems. (Ref 1)

The Hetton Lyons Primary School's green roof is designed to evolve and flourish over the coming years, helping to combat a number of climate change issues facing the next generation. Aims were ecological benefits, providing a natural habitat for plants and wildlife while helping to reduce air and noise pollution, cutting carbon emissions and assisting with rainwater retention and attenuation (Ref 1).

The Knowledge Mile Park initiative in Amsterdam aims to transform the long, busy and traffic-heavy street in downtown Amsterdam into an environment greener, more sustainable and more livable through the implementation on various Nature-based Solutions (9). Smaller projects include the creation and maintenance of pocket parks, green walls and facades, green roofs and living labs. The idea of the initiative came from the Knowledge Mile Community that aims at making Amsterdam more green, clean and smart by means of innovative solutions regarding air quality, climate change resilience, biodiversity and social cohesion. (1) municipality of Amsterdam and the business investment zone BIZ Knowledge Mile are working together with partners on the realization of the project (9)
The project is still ongoing, although parts of the Knowledge Mile Park are already created in 2016 including one living lab, two green roofs, a green canopy and a pocket park and other parts are planned such as the smart green wall (1)

In 2008 the new building of the WGV-Insurance has been opened in Stuttgart. Since then customers and employees of the WGV have enjoyed the beautiful courtyards which contribute to a good working environment. The approx. 3.6 ft. (1.1 m) high, built-in planters have been provided with an automatic irrigation system with the irrigation pipes installed below the elevated concrete slabs. The four courtyards have been planted with a total of 58 small crowned trees. In addition, several extensive green roof areas of approx. 21,600 sq. ft. (2,000 m²) total were installed to improve the Stuttgart climate. (1, 6).

It is the most extensive green roof in Lublin, designed to cover 16,700 square meters rooftop area of the shopping mall 'Castle Terraces' (Tarasy Zamkowe). Its purpose is to serve as a green recreational area for relaxation and public events, as well as an ecological solution for heat mitigation and water retention. The roof is divided into two parts: 1) an area accessible to the public with flower meadows, walking paths, viewing points from which the visitors can see Lublin’s old town 2) ‘intensive cultivation area’ with endemic trees, bushes and succulents which are not directly accessible to the public [1,2,3,8].

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 roof installation at the Re:center building comprises of a wildlife pond planted with native marginal plants, a native wildflower area, grasses and herbs, bird feeder tables, insect houses etc. Design features encourage the development of flora and fauna on the roofing area and a growing media (from ABG) provides a nutritionally rich base for vegetation. Beneath this surface, a free-draining void allows for storage of collected rainwater to irrigate the vegetation. This roof is part of the Bright Building at the University of Bradford. (ref2) The building was known throughout its building phase as The Sustainable Enterprise Centre, but it is recognised that thinking around sustainability has moved considerably since this project started back in 2007 and the new name will ‘re:flect’ new agendas in a way that is distinctive within Higher Education (ref 6).

The Garden Factory ('Tuinfabriek') is an exceptional urban agriculture project on a roof of the central station that aims at becoming the largest food-producing roof of the Netherlands. The project is a self-sustaining vegetable garden located on the roof of a busy mall in the centre of Utrecht (ref. 5). On the roof, citizens, students, company employees and schools work together to grow vegetables and keep bees and chicken. The Garden Factory reflects an ecological 'self-sustaining factory' as the chickens, worms and bees 'work' in the garden as being part of the decomposing system and pollination and a system is built for rainwater retention that allows for irrigation (ref. 1). Eating, composting, sowing, growing, harvesting, cooking form the production process of this Garden Factory (ref. 4).
The main elements of the roof garden are in place, such as the crop bins, the chicken coop and the decomposing machine are completed. However, it is an ongoing developing project as some elements are still in development stage such as some elements of the Soup Kitchen and the aim is to integrate the Garden Factory more with the central station shopping mall in multiple ways (ref. 1).

The city department for green space, environment and sustainability and the foundation citizens for Münster initiated a citizen-based intervention which aims at turning the park area at the "Spickmannplatz“ called "Grünschleife“ into a meeting point for residents and neighbours. The concept for its regeneration is based on workshops and ideation processes of citizens whose involvement goes beyond urban gardening activities but involves an active co-creation of the area by co-planning and development. Apart from several communal restorations works, vegetables, fruits and herbs plantations, a pavilion, a dog station and chessboards with benches were set up (ref. 1).

The Willem Alexander Park is the first roof park of Utrecht and is built on a highway tunnel (the A2 highway) and includes meeting areas, sports and activities and a community garden that contributes to social cohesion. It also allows for cultural development by creating spaces for art and culture and includes a sustainable drainage system (ref. 1, 2). In addition, the Willem Alexanderpark is the first park in which almost two hectares consists of prairie plantings (ref. 2).
The park is intersected by the roads between the City road and Leeuwenstein-North. Each segment between the roads has its own thematic program, appropriate to the size and location in the urban context. The themes are:
– connect & meet
– art & culture
– sports & games
– nature & education
– food & drinks (ref. 4)