Improved stormwater management

In 2015, the municipality of Białystok restored the riverbed of the Biala river to its natural state. The project addresses the rapidly changing climate and atmospheric conditions which cause more frequent storms by improving the water management in the city. The city reconstructed the old riverbanks, built two ponds for retention, which serve as reservoirs and tanks to stop and distribute the excess water [1,2].

The project aims to turn Honkasuo forest and meadow area into an urban village to house 2000 residents. These delightful nature elements have been preserved, for the most part, and the wave of sustainable development that is sweeping over the area has a definite environmental/ecological symbol as well (ref. 4). The constructions are aimed to be made out of wood and are meant to attract a diversity of people. Part of this project is the creation of a park, urban farming plots, natural design to attract butterflies, a playground and natural ponds to retain rainwater (ref. 2,3,4). Part of the development has been completed with residents start moving in 2016, although the landscaped embankment is expected to be completed in 2022

Excess rainwater in sewers causes flooding and the overflow spills into the rivers. Rainwater spilling across pavements can also make for an unpleasant walking experience in the city. Dublin City Council, in collaboration with residents, ran a trial use of Rain Box Planters as a way of both greening the streets and better managing rainwater coming from roofs. The Rain Box Planters were placed below houses’ gutters in order to slow the torrent of water entering the drain. The first trials were successful and the next stage is to test them on a larger scale. (ref 2, 3)

Owing to European Funds, the University of Białystok opened a new modern ecological campus for the faculties of biology, mathematics and computer science. The new campus was designed to incorporate green and blue infrastructure elements, and embody the pro-ecological profile of the investment. Green vegetation covers the university's walls and roofs, which is nearly half of the 30,000 square meters big campus. There is a brook around buildings and small ponds in the university's inner courtyards. The campus uses a sustainable rain drainage system, which is located on the roof, and the rainwater flows to the artificial water tanks and is continuously filtered and redistributed. Finally, there is a publicly accessible centre for ecological education. Large decorative installations on each of the four courtyards enhance the aesthetic experience in the campus and inspire the faculty and students [1,2].

As part of the Fifth Dimension research program of the University of Helsinki that examines green roofs from the perspectives of biodiversity and the three dimensions of sustainable development (ecological, social and economical sustainability), 8 green roofs were installed in Helsinki. The aim was to find economically viable solutions that are applicable to Helsinki’s and Finland’s conditions. The project experimented with green roofs in different parts of the country, over half of which are in Helsinki (ref. 1, 2, 3).

To test the newly developed Green Factor Tool for the City of Helsinki, with a focus on water management, two test sites (ätkäsaari pilot block and the three model yards in Kuninkaantammi) were created at residential blocks in Jätkäsaari and Kuninkaantammi. The tool itself is an Excel interface that calculates the quantity and quality of the city's green spaces per unit of area, It is part of the larger iWATER (integrated stormwater management) project (Ref 2). Specifically, after testing it on these two pilot sites, it is to support land use planning processes by providing a way to account for the quantity and quality of green space. The project aimed to analyze the cost-benefit of implemented sustainable stormwater solutions, compile stormwater-related planning tools as well as increase and strengthen the capacity of cities to work with stormwater issues (ref. 2).
One of the key objectives of developing the green factor method was to create green urban environments that have social value. Also, functionality was the second most important and cityscape (or landscape value) was the third most important category in green factor scoring.

This project deals with the creation of a green roof and a green area around the new headquarters of the IDOM Group (an independent multinational company that offers professional integrated services in Consulting, Engineering and Architecture around the world), located in an old French warehouse (a customs warehouse) on the Deusto canal in the port of Bilbao. It has an area of ​​14,400 m2 dedicated to offices, research and development spaces such as white room and workshop prototypes, and social spaces. (Ref 1)

As part of the EU Life+ CITYWATER project (of 3 cities), a sustainable stormwater management solution based on biofiltration was implemented in Maunulanpuisto Park in Helsinki, in order to purify rainwater and meltwater and improve water quality in the Haaganpuro Brook.
As the drainage area is heavily trafficked and paved with asphalt, high solid, nutrient and oil levels have occasionally been measured in the rainwater and meltwater entering the Haaganpuro brook. Such contamination is harmful to the fish stocks (e.g. trout) and other organisms in the brook. The biofiltration solution was the first of its kind in Helsinki. The solution also supported the City of Helsinki stormwater strategy, which aims at changing management towards sustainable solutions and states that stormwater should in first hand be infiltrated on spot, where it is created (ref. 1).

Kuninkaantammi is a new energy- and eco-efficient residential district by the Vantaa River and Helsinki’s Central Park that is in the construction phase with a dense urban design, consistent with the ecological, experiential and community requirements of modern housing. It will become a climate-smart neighbourhood for 5,000 inhabitants. Environmental factors have already been noted in the zoning of the area, and energy efficiency guides the design and building processes.
Kuninkaantammi will be a pilot project for stormwater runoff management in Helsinki using green infrastructure. The construction is ongoing (2013-2025). Management of storm waters in the area will be carried out through natural methods (ref. 1, 11).

The city of Wuppertal participates as a model region in the joint research project SAMUWA which aims at developing planning instruments which combine urban drainage with urban and open space development measures. With regards to the work package C.1: open space design strategies for a water sensitive city, one focus area and proposed measure, namely the "Varresbecker" flood channel is of special interest since it has been subject to comprehensive implementation plans in Wuppertal so that its implementation can be expected in the next years (Ref. 1, 2, 4 and 5). Alongside the water channel, a recreational area will be created with information to raise awareness about water management issues and climate change. (Ref. 2)