The risk of flooding in urban areas could be better approached by complementing conventional sewer systems with sustainable urban drainage systems (SUDS) for storm-water management. This may be the case for developing world cities like Dar es Salaam with incomplete sewer services, as well as cities like Copenhagen with fully developed sewer systems. This paper explores some theories relevant to understanding how the implementation of SUDS may be one option for supporting a transition towards sustainable urban water management (SUWM). Using interviews, document analysis and observation, a comparison of the opportunities and barriers to the implementation of SUDS in Dar es Salaam and Copenhagen is presented. The results indicate that a bottom-up approach in Dar es Salaam is important, with the community level taking the lead, while in Copenhagen the top-down approach currently employed is promising. The ability of the institutional frameworks of both cities to support the implementation of SUDS is also discussed.

Planning for sustainable mobility is a complex and demanding task and the knowledge of how to trade off multiple, often conflicting, goals is not entirely clear. One of the most contentious and confounding issues in the context of urban planning has been, and continues to be, the place of the automobile within the evolving sustainable mobility paradigm. The recent emergence of strong policy and planning support for the introduction of electric vehicles raises thorny questions as to whether or not this development will be complementary to, or conflicting with, other sustainable mobility planning goals, such as the pursuit of compact cities, restrictions on automobiles, promotion of walking and bicycling, and support for public transport. The results of a recent pilot study conducted in the Reykjavik city region suggest that a strategy of provision for electric vehicles on a large scale may represent a continuation of the dominant transport engineering approach, drawing scarce financial and institutional resources away from path-breaking measures such as the efforts to create denser development patterns and promote non-motorized and public forms of transport.