Paragraph 5 I1

No stage of the authorised development may be brought into operational use until, for that stage, a drainage management plan, to address operational surface water management matters, has been submitted to and approved by the relevant planning authority, after consultation with the lead local flood authority and the relevant highway authority.

The operational use of each stage of the authorised development must be carried out in accordance with the approved drainage management plan referred to in sub-paragraph (1) or with any amended drainage management plan that may subsequently be approved by the relevant planning authority, after consultation with the lead local flood authority and the relevant highway authority.