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BOC Immingham Dissolved Acetylene Project Environmental Statement: Vol. 2 Main Text
9.104 There is a risk of flooding from Middle Drain in the event of failure of the pumping station.
However, the station operates with duty and standby pumps and overall the risk is considered to
be minor for the construction and operational phases.
9.105 The site is at moderate to high risk of flooding from groundwater but the main influence on
groundwater levels within the development site will be the tidal levels. The measures incorporated
into the design of the site to manage the tidal and surface water flood risk are suitable for
managing the groundwater flood risk such that the significance of the impact is considered
negligible for both construction and operation.
9.106 There is an increase in compacted soils and or impermeable areas associated with the proposed
development, and, therefore an increase in surface water runoff. As part of the CEMP, surface
water runoff will be managed such that it will not increase the risk of flooding at the proposed
development site, or to land within the surrounding area during construction. During operation, this
will be managed through an appropriately designed surface water drainage system and pumping
station which outfalls into Middle Drain. The site is considered to be at minor risk of flooding from
pluvial surface water during construction and negligible risk of pluvial surface water flooding during
operation.
5100935.404 Environmental Statement August 2011 143