Over a century ago a sparsely populated landscape of water meadows was transformed into an industrial conurbation, and the untamed river Emscher, in the Ruhr area, turned into a man-made system of open waste waterways. Due to subsidence caused by mining, it was impossible to build an underground sewer system. Therefore, the Emscher and its tributaries were regulated and used to transport the wastewater together with rainwater on the surface. This made the Emscher simply a great open wastewater channel.

Titchwell Marsh lies towards the western end of the North Norfolk coast in UK. It forms a key part of the North Norfolk Coast Special Protection Area (SPA) and Special Area of Conservation (SAC). The freshwater and brackish habitats at Titchwell are protected by seawalls. However, these walls would have been in danger of not being able to withstand the next few years due to coastal erosion and rising sea levels.

To combat the impacts of cloudbursts, the City of Copenhagen developed a Cloudburst Management Plan in 2012, which is an offshoot of the Copenhagen Climate Adaptation Plan. The Plan outlines the priorities and measures recommended for climate adaptation including extreme rainfall. The City carried out an overall assessment of the costs of different measures (traditional vs different options including adaptation measures), the cost of the damages despite the measures and resulting financial impact.

Tamera, a farm of 154 ha, is located in the most arid region of Portugal (Alentejo). This area has shown significant trends of increasing erosion and desertification. Only a few decades ago, the Alentejo was a region where the streams flowed with water all year round, even in summer. Today the streams swell only during the rainy season and afterward they become dry again. The system has fallen completely out of balance and climate change is expected to exacerbate the situation.

At Nijmegen, the Waal River bends sharply and narrows. This creates a bottleneck, which often caused flooding of the historic city centre of Nijmegen, located on the south bank of the Wall. After the floods of 1993 and 1995 and faced with increased risk of flooding due to climate change, the city of Nijmegen decided to give more room to the Waal River, at the same time protecting nearby natural habitats and providing recreational space.

The Kruibeke Bazel Rupelmonde (KBR) Controlled Flood Area (CFA) is a key component of the Belgian Sigma Plan for the Scheldt Estuary. The Sigma Plan is an integrated flood protection plan that combines dikes, seawalls and flood areas to protect approximately 20,000 hectares of land from flooding.

The Sigma Plan is an integrated flood protection plan that was firstly established in 1977, in reaction to a major storm surge flood in 1976. The Sigma Plan offers protection against storm surges as well as river floods caused by excessive rainfall. Its objectives also include nature protection.

This case study describes the flood risk management plan and the related restoration of a formerly canalized eight kilometres stretch of the Isar river in the city of Munich (the so called “Isar Plan”). Still in the beginning of the 19^th century, the Isar was a typical wild alpine river with wide gravel islands and sandbanks and a constantly changing riverbed. In the middle of the 19^th century after repeated flooding suffered by the Lehel, Au and Thal districts in Munich, hydraulic regulation began, and the riverbed was canalized.

The Flemish coast is intensively used by many actors, embracing coastal towns, commercial ports connected to industrial areas, leisure marinas and touristic activities. It is exposed to flooding due to storm events and sea level rise. In 2007, the Flemish Government, after a safety test revealing an insufficient protection of the coast, started the elaboration of an Integrated Master Plan for Coastal Safety that was finally approved in June 2011.

Hesketh Out Marsh is one of the biggest managed realignment projects in the UK and is one of the country’s most important estuary habitats for birdlife. The original saltmarsh was isolated from the estuary in 1980 by the creation of an outer wall, and was used for growing crops. With the sea level rising, it was necessary to create stronger sea defences. By a process known as “managed realignment”, seawater has been let back in to flood the land, re-creating saltmarsh and providing space for nature.