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Hillingdon SuDS Design & Evaluation Guide

Concept

Concept Design 7.0 Design & Evaluation Stage 1 – Concept Design The Concept Design stage is critical for pre-application consultation, as it is an opportunity to offer preliminary design ideas for discussion. It should give an early indication of the type of approach being proposed for surface water management through the SuDS design. 7.1 Objectives of SuDS Concept Design SuDS Concept Design is used to express initial ideas for the management of rainfall within a development. The Concept Design plan and Preliminary Design Statement are necessary for discussions with planners, regulatory bodies, water companies and other stakeholders. 25 7.2 Presentation of the Concept Design submission The Concept Design information will usually be presented in two parts: ■■ ■■ a plan with all aspects of the design that can be shown graphically, and a short SuDS design statement including information such as hydraulic data that is more easily described in words. The Concept Design will reflect the criteria and performance parameters set out in the Surface Water Management Strategy and Flood Risk Assessment for the development, where these are present. It will also meet the Non-Statutory Technical Standards, Planning Policy Framework (paragraphs 100, 103 and 109 - current at time of writing) and Local Authority requirements. Key data and information will include: ■■ ■■ ■■ ■■ data to inform the design, where relevant e.g. maps of site context, outline river and coastal flood risk, surface water flood risk, and ground water source protection a drawing to identify existing landscape and habitat features that may influence SuDS proposals information on utility services, as these may fundamentally affect the SuDS design, particularly on previously developed land or in retrofit schemes a contour plan using the best source of topographical information available. London Borough of Hillingdon SuDS D & E Guide © 2018 McCloy Consulting & Robert Bray Associates

Concept Design for Holyoakes School, Robert Bray Associates Holy SuD key Concept Design Holyoakes School SuDS Concept Holyoakes School SuDS Concept key French Drain Low wall to be used as a seat and to retain flows Storage underneath permeable surfaces Green Roof Rain Garden key French Drain Low wall to be used as a seat and to retain flows Storage underneath permeable surfaces Green Roof Rain Garden Swales and Basins/Pond Holyoakes School Surface Channel SuDS Concept Piped Connection 26 Outfall to Red Ditch key Swales and Basins/Pond Surface Channel Piped Connection Flow Control Control Outfall Overhead Channels Channels Downpipe connection to at surface Channel Surface Flow Flow Control French Outfall Drain Low Overhead wall to be used Channels as a seat and to retain flows Storage Downpipe underneath connection permeable at surface surfaces Surface Flow Flow Green Roof SuDS Flow SuDS Flow Rain Garden SuDS Basin Swales and Basins/Pond N Surface Channel Surface Channel Piped Connection Piped Connection London Borough of Hillingdon SuDS D & E Guide SuDS Flow N Flow Control Outfall Overhead Channels Downpipe connection at surface © 2018 McCloy Consulting & Robert Bray Associates Surface Flow

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