DESIGN GUIDANCE for roads fails to account for their potential to cause floods, the Department for the Environment Food & Rural Affairs said last week.
DEFRA is reviewing the Design Manual for Roads & Bridges, used in the design of strategic roads. It wants designs to fall in line with a new 20 year flood and coastal risk management strategy.
'A Department for Transport policy document on the impact of climate change on the transport network published in January identifies the maintenance and design of urban roads as a key area that needs to be improved in order to deal with the impact of flooding, ' says a DEFRA consultation document published last week.
DEFRA'S Making Space for Water document also proposes that new design guidance for non-strategic roads is developed. It asks respondents to comment on whether this is necessary and who should produce and maintain the guidance.
DEFRA wants to ensure that all UK roads are designed to minimise the risk of flooding.
It also suggests that minor roads are to be used as flood channels, which will require design changes such as raising kerb heights (NCE 7 July).
These roads could then acts as flood conduits and be used to move water from flooded areas to natural watercourses.
Decisions on flooding urban roads would be made by an integrated drainage management team made up of the local council, the Environment Agency, sewerage undertakers and private landowners.
Disruption to local transport services would have to be tolerated if flooding roads can be justified.
INFOPLUS To download the consultation document go to www. nceplus.co.uk