A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Green and grey drainage infrastructure: costs and benefits of reducing surface water flood risk
It is now estimated that in the UK alone 3.2 million properties are at risk of surface water flooding – an increase of almost half a million from ten years ago – and it is expected that this problem will increase further under current climatic changes and urbanisation. Sustainable Drainage Systems (SuDS) seek to reduce flooding from surface water without relying on conventional piped sewer networks by restoring the pre-development hydrological conditions of an area through mimicking natural drainage processes. As their behaviour is more complex compared to their traditional, greyer counterparts, there is still incomplete understanding of their performance during intense rainfall. Research to-date has focused on the optimisation of their design at an infrastructure-scale for achieving hydrological benefits, and a growing number of case studies into their inclusion in small, neighbourhood developments. However, an understanding of the influence of external factors on SuDS behaviours and the additional range of co-benefits SuDS may provide are also important for the design of effective systems, whilst an appreciation of their potential role at greater scales will allow a more informed consideration of drainage alternatives in larger-scale developments. Thus, this thesis investigated how built form influences SuDS’ performance and how the inclusion of SuDS in regional-scale developments may contribute to wider environmental goals. To analyse the effect of urban built form, a range of 1 hectare urban tiles were developed to represent different housing typologies, urban densities and SuDS implementations under current design principles drawn from The SuDS Manual (CIRIA 2015). The rainfall-runoff model Stormwater Management Model (SWMM) was used to simulate storm events of varying magnitudes and the resultant hydrographs analysed. These tiles were then applied to a proposed regional development spanning five counties in south-east England, the Oxford-Cambridge Arc, under eight different scenarios of urban development, ...
Green and grey drainage infrastructure: costs and benefits of reducing surface water flood risk
It is now estimated that in the UK alone 3.2 million properties are at risk of surface water flooding – an increase of almost half a million from ten years ago – and it is expected that this problem will increase further under current climatic changes and urbanisation. Sustainable Drainage Systems (SuDS) seek to reduce flooding from surface water without relying on conventional piped sewer networks by restoring the pre-development hydrological conditions of an area through mimicking natural drainage processes. As their behaviour is more complex compared to their traditional, greyer counterparts, there is still incomplete understanding of their performance during intense rainfall. Research to-date has focused on the optimisation of their design at an infrastructure-scale for achieving hydrological benefits, and a growing number of case studies into their inclusion in small, neighbourhood developments. However, an understanding of the influence of external factors on SuDS behaviours and the additional range of co-benefits SuDS may provide are also important for the design of effective systems, whilst an appreciation of their potential role at greater scales will allow a more informed consideration of drainage alternatives in larger-scale developments. Thus, this thesis investigated how built form influences SuDS’ performance and how the inclusion of SuDS in regional-scale developments may contribute to wider environmental goals. To analyse the effect of urban built form, a range of 1 hectare urban tiles were developed to represent different housing typologies, urban densities and SuDS implementations under current design principles drawn from The SuDS Manual (CIRIA 2015). The rainfall-runoff model Stormwater Management Model (SWMM) was used to simulate storm events of varying magnitudes and the resultant hydrographs analysed. These tiles were then applied to a proposed regional development spanning five counties in south-east England, the Oxford-Cambridge Arc, under eight different scenarios of urban development, ...
Green and grey drainage infrastructure: costs and benefits of reducing surface water flood risk
Chapman, CM (author) / Hall, J
2023-06-15
doi:10.5287/ora-8nr5xpn89
Theses
Electronic Resource
English
Retrofitting urban drainage infrastructure: green or grey?
| Taylor & Francis Verlag | 2018
| BASE | 2013