Impacts of the climate crisis and urbanisation hit urban environments around the world. Cities taking the lead in mitigating or adapting to the impacts, inspire or actively encourage other contexts to adopt their approach. Water-Sensitive Urban Design (WSUD) is an urban water management approach seeking integration with urban design to provide principles for minimising the hydrological impact of cities on its surroundings and enclosed natural environment while maximising positive impacts through ecosystem services. Urban design, however, is by definition context-specific and maladaptative outcome ensued from lacking contextualisation of WSUD. By bringing the urban design process to the fore, the research challenges universality of WSUD and positions the need for enhanced context specificity. Indian secondary city case studies are used to test a reconceptualisation of water sensitivity and provide evidence for the importance of diverse context knowledge and the contribution of urban design methods to gather and articulate such information about a unique site. Emphasised urban design in WSUD shifts its focus from water system optimization to inclusion of context characteristics defining how to design and manage water for each urban environment.

Around the world, the Netherlands has a respectable reputation when it comes to water management, with other countries applying best practices to their own water related challenges. This reputation of the Netherlands has been a result of a decade long tradition of living with challenging water conditions. This has resulted in a highly cultured polder landscape that is iconic to the Dutch identity. This research report will explore how this iconic landscape and its buildings will need to adapt to changing climate conditions and how more awareness could be formed for the country’s special relationship to surrounding water. Focus on this transition is important, as the reclaimed land lies several meters under NAP and is also the location that most housing projects in the Dutch Randstad will be situated on. The ultimate aim of the paper is to create an architectonical tactic for Flood Risk Management (FRM) that can add value to Dutch polder areas by increasing awareness regarding the Dutch relationship to water.

Urban areas project high demand for urban spaces to accommodate a wider range of functions associated with social, economic, and physical development, given the rising rate of urbanization and over two-thirds of the human population projected to be urban dwellers by the year 2050. Consequently, cities are rapidly developing into complex and sprawling infrastructure reservoirs, limiting the capacity of vital natural ecosystem services. Development projects face several time-based constraints to find space for public access. In recent decades, brownfield development has directed its focus towards the subsurface, with the onset of initiatives like “net zero land take by 2050” set by the European Union. Expanding the public realm in cities through brownfield underground development can help close the gap between demand and supply of habitable land within cities, especially in urban areas housing contextual heritage.

There are various socio-cultural agents to be accounted for, which influence the experience of the subsurface. With appropriate structuring of documentation and design methods, underground built environments can potentially link diverse uses like transit, work, recreation, and more. The lack of development strategy inclusive of underground spaces poses risk of exploitation by private sector eventually resulting in super-basements that are value-centric. Underground spaces need a strategic spatial vision where the subsurface ecology is considered and developed in coherence with public life, integrating it with existing infrastructure networks.

The Thesis explores the subsurface uses and their potential to supplement demand of public/mobility space from surface in the city of Amsterdam. The applicability of urban underground functions in a delicate Dutch Landscape presents an opportunity to test and benchmark the suitability of subsurface realm for a range of functions. This is done by generating a guiding methodology for context-specific design interventions, followed by their integration with existing underground resources to form a holistic subsurface network that supplements the surface. The research considers the current technological and urban transitions to utilize them tools for developing underground spaces as collective, feasible, and transformative spaces. Research-by-design approach is used to investigate essential parameters of subsurface design at different scales to contextualize prototypical interventions for Amsterdam.

Portcities are at the forefront of transitioning towards a green and circular economy (UN 2019). Especially in transforming former port areas, the integration of nature-based solutions(NBS) is crucial to increase natural capital and support social- and economical ecosystem resilience. This requires further mainstreaming of NBS in urban design and urban planning practices. In this thesis scenario research-by-design methods are used to explore their implications for the Waalhaven.

The Province of South Holland is conducting a heritage project to explore the historical significance of barge canals and their future role in a changing climate. This thesis aims to address the water challenges posed by increased floods and droughts caused by climate change through the implementation of a water buffersystem. The buffer should allow the region to serve as a drainage during storms and retain water during droughts, considering the projected climate conditions in 2100. The study focuses on a large case study area, the heart of South Holland, which is enveloped by barge canals and divided into three water boards. A water balance model, calibrated using existing pump time series, is utilized to simulate water flows at the polder level. The model demonstrates sufficient accuracy for predicting larger spatial and seasonal scales within the jurisdiction of the water boards. Future conditions are simulated in the model by incorporating KNMI scenarios. However, the scenarios underestimate the occurrence of droughts, resulting in an underestimation of polder inlet and an overestimation of outlet. 
An above-average extreme climate change scenario is used to compensate for these biases. Combining the model output with long term statistical storm and drought forecasts, this leads to a more realistic buffer design capacity. If the reservoirs can be operated as prescribed, the primary hydrological purposes of the natural water buffers can complement each other. The first criterion consists of the buffering of the increased inequality of net inflow distribution throughout an average expected year, for which 20 million m³ with an additional top layer of 115 mm would be necessary. The second criterion entails the draining of the increase of intense precipitation events. 7.5 million m³ would be necessary to drain the extra precipitation of a 1000 year return period storm event. Thirdly, the buffers should be able to provide water, compensating for the aggravation of drought conditions. 34 million m³ should suffice to compensate for the aggravation of droughts with a return period of 2 years and longer. As the criteria are conditionally compatible, 34 million m³ is the net minimum required buffering capacity for the center of South Holland. 
The final optimal buffering strategy entails the realization of a large buffer in the Noordplaspolder, connecting the Rotte and the Hoogeveensche Vaart, and of a smaller buffer in Schieveen. It also requires the expansion of the water reservoirs in the Eendragtspolder and Berkel. The larger buffer will feature a deeper canal, permanently submerged, linking the Rotte and the Hoogeveensche Vaart, which in turn will connect to the nearby boezem water network. The Noordplaspolder and Eendragtspolder will buffer the area of the two water boards Rijnland and Schieland and the Krimpenerwaard that are inside the case study area, Schieveen and Berkel will buffer Delfland. The Schie and the Vliet will play important roles as water carriers between Delfland and its neighboring water boards and the Nieuwe Maas. This strategy not only addresses water management but also offers recreational, historical, and ecological opportunities. It revives the functions of old barge canals, the Vliet and the Schie, and restores the connection between the Rotte and the Hoogeveensche Vaart, adding to the solution's historical value.