Policy information sourced from the Haringey Development Management Plan
DM25: Sustainable Drainage System
- All proposals for new development must seek to manage surface water as close to its source as possible in line with the London Plan drainage hierarchy.
- The Council will require Sustainable Drainage Systems (SuDS) to be sensitively incorporated into new development by way of site layout and design, having regard to the following requirements:
- All major development proposals will be required to reduce surface water flows to a greenfield run-off rate for a 1 in 100 year critical storm event;
- All minor development proposals should aim to achieve a greenfield run-off rate and, at a minimum, achieve a 50 per cent reduction on existing site run-off rates;
- All other development should seek to achieve a greenfield run-off rate and include at least one ‘at source’ SuDS measure resulting in a net improvement in water quantity or quality discharging to a sewer; and
- For all development where a greenfield runoff rate cannot be achieved justification must be provided to demonstrate that the run-off rate has been reduced as much as possible.
- Where Sustainable Drainage Systems are implemented they will be expected to:
- Meet the requirements set out in the Council’s relevant local standards and guidance, or national standards where agreed;
- Incorporate measures identified in the Surface Water Management Plan;
- Be designed to maximise biodiversity and local amenity benefits, and where appropriate, ensure that SuDS techniques provide for clean and safe water at the surface;
- Improve water quality; and
- Function effectively over the lifespan of the development.
- Where SuDS cannot be implemented due to site constraints (such as land contamination or space limitations) robust justification must be provided along with proposed alternative sustainable approaches to surface water management.
Policy information sourced from the Haringey Development Management Plan