marsh areas and tidal mud flat areas on either side of the channel. Embankments are located to the eastern side of Woodbridge and in downstream locations. There are also a number of floodgates found in the Woodbridge area; these are generally located where access and infrastructure intersect the line of flood defence.


67.


The Fynn and Lark catchment is approximately 80km2 and flows east before its outfall into the Deben Estuary just south of Martlesham. The River Lark flows between Martlesham and Woodbridge before outfalling to the Deben Estuary. There are a number of minor tributaries in the catchment, including the Hasketon watercourse.


68.


The latest Environment Agency Flood Zone Mapping (Figure 21.5) indicates that the Onshore Cable Route would cross all Flood Zones in various locations, principally associated with flooding from tidal events and fluvial events around the River Deben, Martlesham Creek and the River Gipping. Other more isolated Flood Zones are present (refer to Figure 21.5).


69.


Finer scale information on the hydrology within the onshore electrical transmission works area will be confirmed during the walkover and included in the final ES.


21.5.2.1 Surface Water Quality 70.


Environment Agency data provided on the ‘What’s in your backyard’ (WIYBY) website2 identifies three river stretches which have historically been monitored. Table 21.11 below summarises the details for each. The locations of the surface water monitoring points are presented in Figure 21.6.


2 http://maps.environment-agency.gov.uk/wiyby viewed on 12 August 2013


Preliminary Environmental Information May 2014


East Anglia THREE Offshore Windfarm


Chapter 21 Water Resource and Flood Risk Page 26


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