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FIGURE E50c 1

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File Name:K:\5004 - Information Systems\60532482 - South Essex SFRA\02_Maps\Figure E50 Southend Breach Maximum Flood Depth – 2116 with climate change 0.1 AEP_DDP.mxd

±0.5 0 0.5 1 1.5km

LEGEND! Breach Location

Maximum Flood Depth (m)> 0 to 0.5m> 0.5 to 1m> 1 to 1.5m> 1.5 to 2m> 2 to 2.5m> 2.5 to 3m> 3 to 3.5m> 3.5 to 4m> 4 to 4.5m> 4.5 to 5m> 5 to 5.5m> 5.5 to 6m> 6m

S OUTHEND BR EACHMAX IMUM FLOOD DEP TH2116 W ITH CLIMATE CHANGE

0.1% AEP

S OUTH ES S EXLEV EL 1 S FR A

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Copy right© Ordnance S urvey Crown copy right and databaserights, 2017. Ordnance S urvey 0100031673. Contains Environm ent Agency inform ation © Environm ent Agency and/or database rights 2017.

Hy draulic m odelling has been undertaken using 2Dhy draulic modelling software MIKE21-HDFM(ver. 2009), to assess the effect of breaches atspecified points and/or overtopping of defences.The model sim ulates 3 tidal cy cles with the peak leveloccurring on the second peak and two slightly sm allerpeaks either side. Breaches in the defence walls aremodelled to occur im m ediately before the peaktidal level to assess the potential im pact of rapidinundation of floodwater.The m axim um flood depth is calculated by subtractingthe LIDAR topographic data from the peak water levelachieved at each elem ent in the model throughout thesim ulation.W hen using flood depth m aps, it should be noted thatthey represent the flood depth arising from one or morespecified breach locations, and that the depth willalmost certainly vary spatially if the breach locations arein different local areas. Changes in inundation extent orm axim um depth are non-linear to changes in breachlocation.It should be noted that the breach width and depth,though based on EA guidance, are arbitrary and donot necessarily represent the actual dim ensions of apotential breach at a given location.A thorough description of m ethodology and assum ptionsis included within the S FR A Main R eport.

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