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Impacts of flooding in the UK case studies - Storms Ciara and Dennis -…
Impacts of flooding in the UK case studies - Storms Ciara and Dennis
impacts of dennis
7 deaths were reported due to drowning in either the sea or rivers
more than 1,400 homes and businesses were affected by widespread floods and vast areas of farmland were inundated
major travel disruption occurred due to fallen trees across roads and rail tracks and high winds caused flights to be cancelled - ferry services were closed with people having to remain on board as it was too rough to dock
high winds caused damage to buildings and bridges
landslides due to saturated ground closed routes including the SW Coast Path near Swanage
villages on the river wye and river usk floodplains were evacuated
the river severn burst its banks in several places including Shrewsbury and iron bridge where flood defences were overtopped
£225 million - mainly flood damage
UK homes suffering power cuts - 26,000
responses
flood warnings were issued
local councils delivered sandbags to properties at risk of flooding
flood defences were erected in towns such as Shrewsbury and Ironbridge
people were evacuated from their homes and temporary emergency shelters opened, eg. leisure centre in the Scottish borders
in yorkshire the army were deployed to help build and repair flood defences
emergency assistance payments were made available to people badly affected by the floods
background information
the excessive rainfall brought by Ciara and Dennis were associated with the North Atlantic Oscillation (NAO) ie. the variation in pressure gradients in the North Atlantic between the 'Icelandic low' and 'Azores high,' during the winter of 2019-20 the NAO was positive, meaning a stronger than usual difference in pressure, and the jet stream brought a series of extratropical cyclones in a westerly path across the UK storm
Dennis had begun as a low-pressure system in the USA - when the depression was south of Iceland, pressure dropped rapidly to 920mb ib 14th February 2020 - falling 46mb in 24 hours, and 84mb un 54 hours, nearly twice the rate required to be classified as a 'bomb cyclone'
storm ciara impacts - 8-10 February 2020
effect on transport - dover ferry services cancelled and dartford and humber road bridges were closed
closure of 20 schools around penrith
cumbria - major water main was damaged causing unsafe chlorine levels
5,000 households affected
insurance claims - expected to be £200 million - mainly wind damage
3 deaths
UK homes suffering power cuts - 650,000