Title:
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Grant-aided flood management strategies in Scotland and England between 1994 and 2004 : drivers, policy and practice
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This thesis investigates the nature of grant-aided flood management strategies for
watercourses approved in England and Scotland between 1994 and 2004. A database
of 595 grant-aided fluvial flood management strategies was established to classify the
character of practice over this period. The presence or absence of 119 distinct
measures of practice were placed in 10 Groups (e. g. Walls, Attenuation or Non-
Structural), and used with cluster analysis to identify three types of practice: those
relating to structural barriers, pumping stations and modifications to the channel.
Structural measures dominated the database.
Multivariate statistical analyses (principal components analysis, chi-squared tests and
discriminant analysis) were used to quantify the main operational drivers upon
practice. New associations were found between the presence or absence of Groups of
practices and the nature of existing flood management activities, environmental
designations, standard of protection, operating authority type and, most significantly,
catchment characteristics. Catchment slope, size, urbanisation, base flow and wetness
characteristics were found by discriminant analysis to be able to correctly predict the
type of strategy in nearly 60% of cases, illustrating the degree of influence exerted by
physical factors.
Spatial and temporal patterns were examined. Regional patterns in flood management
practice were influenced by catchment characteristics and the type of operating
authority responsible. Strategies in Scotland were designed to a higher standard of
protection and were proportionally more likely to involve Attenuation or Adaptation
measures than their English counterparts.
Invasive techniques such as those to increase conveyance, or those involving inchannel
construction, decreased in frequency of implementation. Non-Structural
measures and those deemed as Adaptation saw an increase in adoption over the 10-
year period. Through investigation of a small sample of rejected alternatives, a rise in
the appraisal of land use modifications was observed. These results illustrate a shift
away from structural dominance, in line with calls for sustainable flood management.
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