Innovative contracting in infrastructure design and maintenance
This paper describes the results of research into the contract arrangements and design processes for contractors in the road infrastructure industry. The changing institutional environment has led the industry to believe that more opportunities can be realised to the benefit of society (lower cost, higher quality, more efficient design and design process) when contractors are allowed more 'design freedom' in their contracts with governments. We have explored the technical design space, and developed a framework to structure this space. Next, we identified, through many indepth interviews and case studies, a number of technical, organisational and institutional opportunities, threats and barriers for granting more design space. Finally, the paper discusses the conclusions that could be drawn from the mapping of the opportunities onto the bottlenecks, and it shows that much can indeed be gained, but that many of these opportunities for cost reduction or value improvement are hampered by large, inert institutional settings.
Learning and Action Alliances for the integration of flood risk management into urban planning: a new framework from empirical evidence from The Netherlands
Abstract Urban development and regeneration present windows of opportunity to reduce flood vulnerability that are often not taken advantage of. Collaborative planning is needed to integrate planning and flood risk management and can be achieved by a social learning framework: Learning and Action Alliance (LAA). This paper presents a new framework on how to organise a LAA to support collaborative planning. The framework is verified based on empirical evidence from 2 case studies in The Netherlands where LAAs supported the adoption of an integrated approach to flood risk management and urban development. More than 60 interviews reported that the LAA helped develop and applied relevant knowledge in 3 types of joint activities: system analysis; collaborative design; and governance. These supported demonstration projects through 3 threads by: establishing facts; creating images; and setting ambitions. This was done via 3 streams by: addressing problems; developing solutions; and influencing politics. The new framework has been demonstrated to provide an effective guide to the organisation of a LAA and provides a new analytical tool to assess the impact of LAAs. Other success factors for LAAs and the better integration of flood risk management into the planning process are considered.
Impacts of climate and land use changes on flood risk management for the Schijn River, Belgium
Abstract Flooding is the most common natural disaster in Europe. Modern flood risk management relies not only infrastructure development but also on governmental and non-governmental actors applying legal, economic and communicative water management instruments. Within the European Union (EU), flood management closely relies on policy set at the EU and national levels. It is now recognized that a sound understanding of climate change is required in addition to current management by taking into account land use change and socio-political context, as climate and land use changes have major impacts on hydrological responses. This paper investigates the hydrological behavior due to urbanization under current and future climate scenarios of high summer and high winter rainfall for 20 sub-catchments of the Schijn River, located in the Flanders region near Antwerp, Belgium. As urbanization increases and existing rainfall-runoff models neglecting the specific behavior of urban runoff, a hydrological model was developed based on a basic reservoir concept and applied to the existing rainfall-runoff model (PDM) flow to examine the specific urban contribution. Results revealed that peak flow for urban runoff and the total peak flow (i.e. rural and urban runoff) were significantly higher (i.e. ranges from 200% to 500%) than the existing rainfall-runoff model (PDM) flows, because of faster and more peaked urban runoff response. The impact of climate change on current and future conditions was also assessed by estimating peak flows with respect to return periods from the flood frequency curve. The predicted peak flow of high summer future climate scenario was significantly higher (i.e. ranges from 200% to 250%) than that of the current climatic condition for this region. Furthermore, hourly peak flow and daily volume ratios of 100-year return period for the highest, lowest and average impervious area were projected for the time horizon of the year 2100. It is concluded that climate change impacts contribute the most in producing peak flow in coming years, while increased urbanization takes the second place for both hourly and daily values. Results on urbanization effect and climate change impact assessment are useful to the water managers for spatial planning, emergency planning and insurance industry.