123


The Surface Water and Drainage Management Plan will include provisions regarding use of best practice methods where any discharge to watercourses are proposed, in order to minimise impacts on water quality and flood risk.


124 Accompanying the Surface Water and Drainage Management Plan and request for Land Drainage Consent for permanent works, screening assessments for theWater Framework Directive (WFD) will be undertaken for the permanent infrastructure of the project. These screening assessments will be submitted to the Lead Local Flood Authority, East Suffolk Internal Drainage Board and the Environment Agency as appropriate.


125 Where appropriate, the principles of Sustainable Urban Drainage Schemes (SUDS) will be applied and the principles, as set out in industry guidelines, identified below will be followed. SUDS principles will be applied where necessary, but in particular to the design of surface water management controls at the Converter Station.


126 At the Converter Station, the proposed surface water drainage scheme will be designed to meet the requirements of the NPPF by limiting the post development off site run-off to the existing Greenfield rate and providing sufficient on site attenuation for rainfall events up to the 1 in 100 year rainfall event, plus a 30% allowance for climate change over the lifetime of the development.


127 Sustainable drainage is a departure from the traditional approach to draining sites. There are some key principles that influence the planning and design process enabling SUDS to mimic natural drainage by:


storing runoff and releasing it slowly (attenuation) allowing water to soak into the ground (infiltration) Slowly transporting (conveying) water on the surface filtering out pollutants allowing sediments to settle out by controlling the flow of the water.


128


Run-off from the Converter Station site will be limited, where feasible, through the use of infiltration techniques which can be accommodated within the Order Limits. Where the proposed run-off rate from the site exceeds the current rate, the additional run-off will be attenuated using SUDS storage techniques. The SUDS principals will be implemented so as to mimic the existing environment at the Converter Station site and will take into account the principles and provisions of the Outline Landscape and Ecological Management Strategy, considering synergies where possible.


Outline Code of Construction Practice . Version 3. Page 37


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