8.—(1) Numbered work 2 of the authorised development is not to commence until, for numbered work 2, written details of a surface and foul water drainage plan (including means of pollution control) have, after consultation with the relevant sewerage and drainage authority, been submitted to and approved by the relevant planning authority, such strategy to be in substantial accordance with the principles set out in Section 5.2 of the flood risk assessment.
(2) The surface and foul water drainage plan must be implemented in accordance with the approved details.