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The Triton Knoll Electrical System Order 2016

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Requirement for surface water drainage scheme

10.—(1) Work Nos. 9, 50, 54A and 54B must not be commenced until a surface water drainage scheme for the Work, or part of the Work, in question has, after consultation with Lincolnshire County Council and the relevant drainage boards, been submitted to and approved by the relevant planning authority.

(2) The surface water drainage scheme submitted under paragraph (1) must be based on sustainable drainage principles and an assessment of the hydrological and hydrogeological context of the authorised development and must be in accordance with the surface water drainage strategy submitted as part of the flood risk assessment included within the environmental statement.

(3) Where relevant to the Work, or part of the Work, in question, the scheme must include—

(a)provision for limiting the surface water run-off generated by all rainfall events up to the 1 in 100 year plus 20% (for climate change) critical rain storm so that it will not exceed the run-off from the undeveloped site and not increase the risk of flooding off-site;

(b)provision of surface water run-off attenuation storage to accommodate the difference between the allowable discharge rates and all rainfall events up to the 1 in 100 year plus 20% (for climate change) critical rain storm;

(c)detailed design (plans, cross-sections and calculations) in support of any surface water drainage scheme including details of any attenuation system and the outfall arrangements;

(d)details of how the scheme is to be maintained and managed after completion; and

(e)details of percolation testing (carried out in accordance with Building Research Establishment Digest 365 or Construction Industry Research and Information Association guidance R156) to demonstrate that the use of infiltration techniques are suitable.

(4) The surface water drainage scheme must be implemented as approved.

(5) In this Requirement, “relevant drainage boards” means the drainage boards within the meaning of section 25 of the Land Drainage Act 1991(1) for the area in which the Work is situated.

(1)

Section 25 was amended by paragraph 33 of Schedule 2 to the Flood and Water Management Act 2010.

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