🌧️ NEW National SuDS Standards: Understanding the Runoff Destination Hierarchy

The recently updated National Standards for Sustainable Drainage Systems (SuDS) have introduced a clear hierarchy for runoff destinations that will reshape how we approach drainage design across the UK.

The New Hierarchy Explained:

Priority 1: Collection for Non-Potable Use 🔄 The highest priority encourages rainwater harvesting for irrigation, toilet flushing, and other non-drinking applications. This represents a significant shift towards water conservation and circular economy principles.

Priority 2: Infiltration to Ground 🌱 Ground infiltration through soakaways, permeable paving, and infiltration basins remains a cornerstone of sustainable drainage, supporting natural groundwater recharge.

Priority 3: Discharge to Above-Ground Surface Water Bodies 🏞️ Rivers, lakes, and ponds offer natural discharge points that maintain the water cycle while providing potential for water quality treatment.

Priority 4: Surface Water Sewers & Piped Systems 🚰 Traditional surface water drainage systems, while still important, are now positioned lower in the hierarchy to encourage more sustainable alternatives.

Priority 5: Combined Sewers ⚠️ The lowest priority option, reserved for situations where other alternatives aren't feasible, helping reduce pressure on our aging combined sewer infrastructure.

What This Means for Your Projects:

✅ Early planning is more critical than ever

✅ Water harvesting systems will become standard considerations

✅ SuDS proposals must demonstrate hierarchy compliance

✅ Local Authority approvals will scrutinize destination choices

As drainage designers, we're already adapting our approach to align with these standards, ensuring every project maximizes sustainable outcomes while meeting regulatory requirements.

Are you planning a development project? Understanding these priorities early in the design process can save time, reduce costs, and ensure smoother planning approvals.