Hillingdon SuDS Design & Evaluation Guide

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Overview 2.2 The ground becomes saturated After a while the surface of the landscape Where the ground is permeable, water can absorb no more water. begins to soak into lower soil profiles and then the underlying geology. This is called infiltration and is common on sandy, gravelly and limestone soils. In landscapes with infiltrating soils, after interception losses have taken place, most rainwater is lost by soaking into the ground. 5 London Borough of Hillingdon SuDS D & E Guide © 2018 McCloy Consulting & Robert Bray Associates
Where the ground is impermeable, water begins to trickle and flow across the surface, collects in natural depressions, and is stored in wetlands. These natural features attenuate the rate and volume of flow of rainwater running off the landscape. These flows are called natural or greenfield runoff. Overview Surface flow rates are small at first, but increase with higher intensity rainfall events. The volume of runoff will generally be greater with increased rainfall intensity and duration. 6 London Borough of Hillingdon SuDS D & E Guide © 2018 McCloy Consulting & Robert Bray Associates
Page 1 and 2: Sustainable Drainage Design & Evalu
Page 3 and 4: Contents 1.0 Introduction 2.0 Under
Page 5 and 6: This development guide has the supp
Page 7 and 8: 1.2 SuDS today There have been a nu
Page 9: 2.0 Understanding Rainfall It is im
Page 14 and 15: Overview 3.0 The Impact of Developm
Page 16 and 17: Overview 3.3 Consequences of piped
Page 18 and 19: Overview 4.0 The Role of SuDS Susta
Page 20 and 21: Overview SuDS schemes offer diverse
Page 22 and 23: Overview 5.0 The SuDS Design & Eval
Page 24 and 25: Overview 5.3 The objectives of the
Page 26 and 27: Local SuDS requirements 21 6.0 Land
Page 28: Local SuDS requirements 23 Local Su
Page 31 and 32: Concept Design for Holyoakes School
Page 33 and 34: 7.4 Concept Design process 7.4.1 Fl
Page 35 and 36: Modifi Step 2 - Modified Flow Route
Page 37 and 38: 7.4.3 Collection of runoff from har
Page 39 and 40: 7.4.5 Conveyance of runoff between
Page 41 and 42: A flow control generally defines th
Page 43 and 44: Additional considerations for infil
Page 45 and 46: 7.4.9 Preliminary flow and volume c
Page 47 and 48: 7.4.11 Managing runoff from site If
Page 50 and 51: Concept Design 45 7.4.13 Flow rate
Page 52 and 53: Concept Design Long Term Storage Su
Page 54 and 55: Concept Design 7.5 Concept informat
Page 56 and 57: Concept Design 51 7.5.3 Preliminary
Page 58: Concept Design 7.5.6 Management and
Page 61 and 62:
5. Quality Confirm ‘treatment sta
Page 63 and 64:
8.2 Objectives of SuDS Outline Desi
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8.4 Design criteria considerations
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8.5.2 Aspects of Health and Safety
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8.8 Outline information required fo
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Detailed Design 9.0 Design and Eval
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Detailed Design 9.3 Typical Detaile
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Detailed Design 71 Plan excerpt: pr
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Detailed Design 73 9.3.4 Detailed D
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9.4 Critical levels Levels are impo
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9.5.3 Calculation processes Calcula
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9.5.4.3 Making allowances for inter
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9.5.4.6 Accounting for Climate Chan
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9.5.5 Calculating storage requireme
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Approach 2 Where volumes cannot be
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Detailed Design 88 Designers should
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Detailed Design Lamb Drove, Cambour
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Parameter Modelling of the SuDS lay
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9.6.1 Design flexibility A framewor
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9.6.4 Single, tiered storage compon
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9.6.6 The importance of protected o
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the 1 in 100 flow rate - for exampl
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9.7 Water quality Rainfall picks up
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For low to medium risk sites, the i
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9.7.5 Water quality design checklis
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9.8.2 Accessibility All parts of th
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Firstly the collection and conveyan
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9.9.3 Key design criteria for biodi
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9.10.2 The Principles of SuDS plant
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Amenity grass An everyday grass sur
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Meadow vegetation Meadow vegetation
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Bioretention features are defined b
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9.10.3.4 A place for trees and shru
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Source Controls providing collectio
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Raingardens The raingarden concept
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Permeable surfaces Permeable surfac
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Filter drains Filter drains, someti
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Filter strips The hard edge from a
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Detailed Design 135 The safety cons
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Detailed Design 9.11.5 Storage stru
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Detailed Design 9.12 Management of
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Detailed Design 9.12.3 Example of S
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Sheffield Grey to Green : an excell
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Hillingdon SuDS Design & Evaluation Guide

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