Flood peak reduction

The CLEVER Way: Hamburg, Neugraben-Fischbek

The CLEVER Cities project identified the primary planning goals for Neugraben-Fischbek district located in the South-West of the city of Hamburg was to: (a) creating a connective ‘Green Corridor’ to link a system of NbS interventions; (b) establishing horizontal greenery through the construction of green roofs on existing buildings; and (c) address the topic of environmental education and connect the youth with nature.

Hamburg has aimed at addressing the following challenges, including:

Increase biodiversity and nature in the city: To address this, the city

The objectives of the case were to i) develop a systematic and interactive approach to support multi-objective urban planning in general and ii) to demonstrate the approach in the Kivistö sketch area in developing and evaluating alternatives for urban planning and decentralised stormwater management.

The existing old dam at Lake Svintjønna. The measures will increase the dam height by ca. 0.5 m and establish a new gate and threshold, with automatic monitoring of the lake level.

The Skurdalsåa River is one of many steep tributary rivers to the main river Gudbrandsdalslågen. The river has its outlet from an old dam (1870) in Lake Svintjønna. Due to the relatively small catchment, Skurdalsåa responds rapidly to precipitation and snow melt. Roads, houses, a school, a kindergarten, and a sports facility are situated adjacent to the lower part of the river. The infrastructure has experienced repeated flood damage in recent years.

Through the H2020 project PHUSICOS an old dam has been modified in order to reduce the peak flood.

AteNas is built around 3 demonstration sites, covering urban and periurban zones of Łódź, Lyon and Vantaa/Helsinki and sharing the challenge of enabling water to citizens and nature, both in terms of quality and quantity.

Utilize of cities water resources to secure regulating ecosystem services, enable Nature-Based Solutions, and enhance adaptive capacity to global changes.

The city of Genoa experiences acute densification and lack of public green spaces, making urban heat stress a pronounced challenge. Air pollution and biodiversity loss are among the other challenges Genova targeted to address through NBS implementation.

Several streets around the Eindhoven city centre (Waagstraat, Bilderdijklaan, Willemstraat, H. Boexstraat and Dommelstraat) have been rehabilitated and nature-based solutions such as bioswales and street trees have been introduced to address existing problems with heat stress and flooding, and to enhance biodiversity and attractiveness for pedestrians and cyclists.

The previously stone-covered Clausplein square is located in a dense urban area in the city centre of Eindhoven and is greatly affected by extreme weather events. After reconstruction, the square has become a small urban park with an underground water retention basin.

Vestdijk has been transformed from a busy grey street mostly used by cars into an urban boulevard - creating more space for pedestrians and cyclists, targeting urban heat and air quality. The street now features more green areas such as street trees, rain gardens, and green strips with perennials and mixed grasses.