Influence of vegetation composition on runoff in two simulated green roof experiments

Despite the fact that green roofs are based upon living systems, the majority of published research literature contains little specific information on the contribution of plants to the various functions and properties of green roofs. Furthermore, there has been little investigation of the influence of the composition of vegetation on the physical properties of a green roof system. This paper reviews previously published material that throws light on the role of vegetation composition on green roof function, with particular regard to rainwater runoff. Two experiments at the University of Sheffield, UK, are considered in detail: (a) An outdoor lysimeter experiment that investigated the quantity of runoff from trays containing 100 mm of growing medium and combinations of grasses and forbs, together with bare substrate, and (b) a greenhouse experiment using simulated rainfall to estimate the amount of rainfall intercepted by different vegetation types. In both cases the vegetation ranged from simple monocultures of forbs and grasses through to complex mixtures of both. In both cases, the composition of the vegetation was found to significantly affect both the amount of water retained and released from the system.     

Current Constraints and Future Directions for Risk Adapted Land-Use Planning Practices in the High-Density Asian Setting of Ho Chi Minh City

The need to integrate adaptation efforts into land-use planning policies has been only recently recognized in Ho Chi Minh City. The city's latest planning guidance addresses both flooding resilience and mitigation of urban heat. This paper outlines the development contexts and the current barriers for adapted land-use planning within the city. The key challenge for land-use planning is communicating the important functions and services of open and natural urban spaces and effectively guiding the mainly individual developer-driven development. As the realization of non-structural adaptation measures is in strong contrast to the current market-driven private and short-term developer interests, the main development trajectories are questioned and synergies identified.     

From Maria Colwell to Victoria Climbié: reflections on public inquiries into child abuse a generation apart

This paper compares and contrasts the Maria Colwell and Victoria Climbié Inquiry Reports. It argues that rather than concentrating on the similarities, it is more important and challenging to consider the differences as exemplars of the changing contexts of child protection in England over the past 30 years. The differences are analysed in terms of: the inquiries themselves; globalization and identity; expert knowledge; systematic care, responsibility and accountability; managerialization; trust and uncertainty; and the legislative contexts. The overall impression is one of increased complexity, where the responsibilities of agencies have both broadened and intensi?ed at the same time. Copyright © 2004 John Wiley & Sons, Ltd.     

Kinship care in Australia

Kinship care is the fastest growing form of out‐of‐home care placement in Australia. It is now a more common form of placement than foster care in some Australian states and is the most common form of placement for Indigenous children nationally. This paper reviews national data and reports ?ndings from a state (New South Wales) study of the experience of kinship carers, children and workers. Relative carers, children and child welfare caseworkers were found to identify psychological bene?ts, family obligation and criticism of other forms of care as reasons for preferring kinship care. Legislation and policy, particularly the Aboriginal Child Placement Principle, are also identi?ed as factors contributing to the rise in kinship care. Concern for the high levels of stress among carers and the low levels of monitoring of children's safety and well‐being are discussed and a stronger policy and practice response from government agencies is proposed. Indications of new policy and programme responses are demonstrated by several recent initiatives at state and national levels. Copyright © 2004 John Wiley & Sons, Ltd.     

Traditional vs. Modern Food Systems? Insights from Vegetable Supply Chains to Ho Chi Minh City (Vietnam)

This article describes the development of vegetable marketing in Ho Chi Minh City (Vietnam), where modern distribution outlets are competing fiercely with traditional traders for wholesale and retail customers. Data from interviews with supply chain stakeholders and a survey of vegetable wholesalers have been used to compare the performance of modern and traditional chains, and the findings reveal the chains as segmented in their product focus, the modern sector focusing exclusively on quality. Modern marketing channels are generally more efficient than traditional ones but still account for only around 2% of vegetable distribution. The article argues that policy‐makers should not promote the ‘modernisation’ of food systems at the expense of traditional channels which meet important consumer needs.     

Methods For Comparing The Mortality Experience of Heterogeneous Populations

Methods are presented which produce Maximum Likelihood Estimates (MLE) of the degree of heterogeneity in individual mortality risks under a variety of assumptions about the age trajectory of those mortality risks. With these estimates of the degree of population heterogeneity it is possible to adjust comparisons of mortality risks across populations for the effects of population heterogeneity, differential mortality selection, and different age trajectories of the force of mortality. These methods are demonstrated by applying a variety of standard assumptions about the age trajectory of the force of mortality to the analysis of a broad range of cohort mortality data for the U.S. and Swedish populations. The estimates of the degree of heterogeneity, produced under all of the selected force of mortality models, consistently indicated a considerable degree of heterogeneity in mortality risks.