12.—(1) Except where the authorised development is constructed in accordance with the approved drainage strategies, details of the surface and foul water drainage system (including means of pollution control and information demonstrating compliance with the best practice for sustainable drainage schemes) must be submitted to and approved in writing by Central Bedfordshire Council. Unless otherwise agreed in writing by Central Bedfordshire Council, such details must accord with the principles of the drainage strategy submitted with the application, making provision for the construction of Work No. 3, and must be implemented in accordance with the approved details.
(2) The drainage strategy must provide that all drains provided as part of the authorised development must, where necessary and appropriate, contain trap gullies or interceptors.