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Compliance & Reporting Defra NSTS S2

Standard 2 Interception Checker

Quick check: first 5 mm interception storage compliance for any catchment.

1
Overview
2
Components
3
Analysis
4
Results

Site Overview

Enter total site area and impermeable areas for S2 compliance calculation

Project Information

Defra S2 Standard

Sites must provide 5mm of interception storage across all contributing SuDS components. This represents the daily rainfall that must be managed on-site for a typical UK location.

Required Interception Volume (5mm) 0 m³

How is this calculated?

Required volume = Impermeable area (m²) × 0.005m (5mm)
Example: 85,000 m² × 0.005m = 425 m³

Component Contributions

Add each SuDS component and calculate interception credit

Component Type Area Served (m²) Component Area/Vol Credit (%) Interception (m³) Action

Interception Credit by Component Type

Permeable Paving: 100% of area | Green Roof: 100% (substrate ≥80mm) | Bioretention: 100% (infiltration-capable) | Soakaway: 100% | Tree Pit: ET credit | Swale: 50-100% | Filter Strip: 50-80%
Detention Basin (lined): 0% (attenuation only) | Retention Pond: 0% | Attenuation Tank: 0%

Gap Analysis

Compliance review and recommendations

Required Interception 0 m³
Total Interception Provided 0 m³
Surplus / Deficit 0 m³

Results Summary

Component contributions and compliance status

Component Type Area Served Interception Credit Volume Contribution % of Total

Contribution Breakdown