Follower cities that would be particularly interested in this theme are cities in regions of water scarcity. For Europe, this would be predominantly cities in the Mediterranean. There are several cities that have a particular low drinking water consumption and could be considered as front runners. Examples are Kortrijk (Belgium), Copenhagen (Denmark) and most Dutch cities. In addition, the city of Melbourne (Australia) has also much experience in this field as it had to adapt to the millennium droughts. Different techniques have been identified that can improve the variables related to water conservation. In particular, systematic monitoring techniques have been identified. The city of Jerusalem has a good track record that has the potential facilitate a vivid interaction of best practices with follower cities in the Water Community environment. The city of Berlin (Germany), is one city that would be interesting to include in the Water Community environment as they also have many best practices with respect to variables related to water conservation. Finally, best practices of water quality have been identified. Water quality is a very broad theme. The city of Sabadell is well-known for their recycling of wastewater for purposes that require less stringent water quality standards. Other cities such as have similar best practices such as for greenhouses in Torre Marimón (Spain), industrial purposes in Tarragona (Spain), for irrigation purposes in Shafdan (Israel) and urban and recreational purposes such as in Sabadell and El Port de la Seva (Spain).
Also note that the cities that are the most vulnerable to river peak discharges often are also vulnerable to sea level rise. These cities might be follower cities that are interested in Water Communities regarding extreme weather events based on the challenges these cities face. Within Europe, we identify a few cities that might have a particular interest in the DSP based their high vulnerability to extreme weather events and river peak discharge. Examples of these are the city of Athens (Greece), Bucharest (Romania) and Varna (Romania). However, it is important to state that many more cities in Europe and beyond are vulnerable to weather events. Extreme rainfall events will increase both in frequency and magnitude because of climate change and can affect most cities (EEA 2012).