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💧 Drainage Strategy Builder
Generate a surface water drainage strategy for your planning application. Calculate discharge rates, identify suitable SuDS techniques, determine attenuation requirements, and produce compliance documentation.
Primary use of the development
Total site area in hectares
Existing hardstanding, buildings, roads
After development completion
Affects infiltration suitability
Seasonal high water table
Current surface water outlet
UK average ~5 l/s/ha; may vary by region
Space available for attenuation features
Generating drainage strategy...
About this tool: Drainage Strategy
Surface water drainage strategy — SuDS hierarchy compliance, greenfield discharge rate targeting, attenuation volume calculation, and CIRIA C753 methodology.
When to use it
Required for most developments that increase impermeable area. LLFA consultation is mandatory for major applications. SuDS are expected unless demonstrated impractical.
Policy and guidance it draws on
NPPF drainage policy F8, CIRIA C753, LLFA requirements
Part of Environmental Intelligence
Use these tools when preparing technical reports and compliance documentation. Many of these are validation requirements — submit without them and your application will be returned. Use the Validation Pre-Flight tool to check which ones you actually need.
Related tools
Energy StatementSustainabilityFire SafetyWater EfficiencyWaste ManagementOverheatingOdour ImpactVibrationGuidance to help you prepare — not formal planning advice. Check the current policy text and your council's local plan before relying on it.