There is also a limited budget for the scheme and a higher wall may not be considered to be acceptable aesthetically, consequently this level of protection was deemed appropriate.’ The top of the wall has been designed to be 100mm above the 1% annual probability flood event (including a 30% increase to take account of climate change) to provide a safety factor. Why can’t the wall be built higher to give greater protection? Also register your property for flood warning updates at. ‘Property level protection should be considered such as flood gates, air brick covers and sand bags, visit for more information. How do I protect my property if the design storm is exceeded?
#SUSANNAH FLOOD MEASUREMENTS PLUS#
‘No, if your property is shown to be within the defended area in figure 2 then once the scheme has been implemented it will be protected against the 1:100 year plus 30% storm event, as long as the defences remain in place and the standard of protection is not exceeded.’ Will this stop my house from ever flooding? In any given 100-year period, a 100-year event may occur once, twice, more, or not at all.’ It does not mean that a 100-year flood will happen regularly every 100 years, or only once in 100 years. ‘No, a return period is a magnitude of storm, not an interval between flood events. Areas at risk of flooding before flood defences erectedĭoes this mean Winchester is protected against flooding for the next 100 years? The depth of the flood water can be up to 600mm, dependent on location. Hydraulic modelling was carried out to produce a map that identified the areas within the north of Winchester that are at risk of fluvial flooding during a 1% annual probability flood, including an increase of 30% to allow for climate change. Where gaps in the wall are required, they can be closed during a flood event using temporary flood gates, or sand bags as part of the Multi Agency Flood Action Plan. The flood defences mainly consist of brick walls which reduce the need for temporary sand bags to be installed during a flood event. All new flood defences were constructed to the height of the 1% annual probability flood +30% climate change water level, this is greater than the highest water level recorded during the 2014 event. Multi Agency Flood Response team with flood barrier in Park Avenue 2014Ī hydraulic modelling assessment was undertaken to determine the river flood water level associated with the 1% annual probability flood (1:100 year storm return period), plus 30% increase to allow for climate change.
The response involved a great deal of intensive work and associated resources provided through joint agency working and with government support. The most recent flooding occurred in the winter of 2013/2014 where a well-managed flood response from Hampshire County Council, Winchester City Council and the Environment Agency prevented significant damage to properties and assets from occurring. The highest level of flood water was recorded in 2014. The greatest impact occurred in the winter of 2000/2001, with significant damage to properties and assets within Winchester. Winchester School of Art, Park Avenue flooded 20 During prolonged periods of rainfall the ground water levels rise resulting in an increase in the water level of the river. The River Itchen is a chalk stream and is fed by groundwater. The Itchen’s flow is restricted through Winchester by the Durngate Sluice, City Mill and Wharf Mill. The River Itchen flows from its source, south of Cheriton, through the City of Winchester to Southampton Water. Hampshire County Council, Winchester City Council, the Environment Agency, and the University of Southampton worked together to develop a flood water management scheme around the North Walls/Park Avenue area of the city which created flood defences to protect properties and assets to the north of Winchester city centre against fluvial (river) flooding from the River Itchen and to reduce resources required during future flood events.
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