Sustainable Drainage Systems Major Design Guidance

Construction / Structural Integrity:

Responsibility for design safety and structural integrity of individual surface water drainage elements is set out in the construction Design and Management Regulations (CDM) Regulations which is not within the LLFA’s remit to assess.

The applicant must provide a section within the Drainage Strategy or a standalone document confirming how this standard has been met, including design life, construction risks and phased development where applicable. This information will be considered at the application stage, with the detailed design information required at the pre-commencement condition stage (if not supplied prior to this).

Maintenance and Management Plan:

At the planning application stage future maintenance and access requirements must be considered and clearly set out in the Drainage Strategy to enable agreement of the principles.

The detailed information as listed in the National standards for sustainable drainage systems will be considered at the application stage, with the detailed design information required at the pre-commencement condition stage (if not supplied prior to this). Furthermore, the applicant should provide a plan which clearly demonstrates maintenance responsibilities.