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Hillingdon SuDS Design & Evaluation Guide

Concept

Concept Design Checklist for Concept Design Stage Design Check Requirement 1. Data gathering Information to understand site To understand site constraints that inform Concept constraints including geology, Design topography, flood risk, utilities, landscape context, community and wildlife Planning requirements that influence To be aware of planning constraints that impact SuDS design SuDS design 2. Flow route analysis Existing flow routes Modified flow routes To understand site hydrology To understand the impact of development 55 3. General SuDS design elements Collection of runoff Source control Conveyance Management train Sub-catchments Storage Flow control Outfall Runoff retained at or near the surface Primary treatment stage to protect the development At or near the surface SuDS components in series to manage quantity and quality Dividing development into discreet SuDS entities Indicate extent and location where runoff is stored Location to demonstrate storage location Locations and method of discharge 4. Quantity Confirm interception losses will occur Confirm how rate of flow from development will be reduced to greenfield runoff rates Confirm how runoff will be managed to greenfield runoff volumes Confirm climate change allowance and whether urban creep is applied Confirm ‘long term storage’ Demonstrate the use of SuDS components that provide interception losses Demonstrate flow rates are achievable. Increase in allowable discharge rates e.g. brownfield sites only in agreement with LPA/LLFA Demonstrate whether Approach 1 or Approach 2 will be used to manage volumes Demonstrate additional volumes to be managed Demonstrate no increase in runoff from predevelopment status London Borough of Hillingdon SuDS D & E Guide © 2018 McCloy Consulting & Robert Bray Associates

5. Quality Confirm ‘treatment stage’ requirements Confirm source control is present Confirm interception losses Demonstrate SuDS components used in series to mitigate ‘pollution hazard level’ Demonstrate protection of development to enable amenity and biodiversity benefits Demonstrate everyday pollution retained on site Concept Design 6. Amenity Legibility Accessibility An understanding of how the SuDS function by people using or managing the site All parts of the SuDS easily reached and safe for recreation and maintenance. Safety by design. Multi-functionality Visual character All parts of the SuDS landscape usable wherever possible All elements of the SuDS design attractive (or at least visually neutral, e.g. inlets, outlets, and control structures) and safe 56 7. Biodiversity Clean water Connectivity Topographical diversity Habitat creation Sympathetic management ‘A controlled flow of clean water’ within and outside the site using ‘source control’ and the ‘management train’ Links to outside and within development to ensure plants and animals can travel between habitat areas Variable vertical and horizontal structures for complex habitat development Exploit opportunities through ecological design Create a mosaic of habitat types through maintenance London Borough of Hillingdon SuDS D & E Guide © 2018 McCloy Consulting & Robert Bray Associates

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