27/11/2019 1 Sustainable Drainage Systems (SuDS) What are SuDS and how can they improve drainage? • About Metis Consultants • What are SuDS • The policy - why we should manage surface water • Key principles in design and implementation • Case studies What are SuDS and how can they improve drainage? We will discuss… 1 2
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27/11/2019
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Sustainable Drainage Systems (SuDS)What are SuDS and how can they improve drainage?
• About Metis Consultants• What are SuDS• The policy - why we should manage surface water• Key principles in design and implementation• Case studies
What are SuDS and how can they improve drainage?
We will discuss…
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Civil and Environmental Engineers• Water and Environment Lead Local Flood Authority Support Flood Risk Appraisals Drainage Design
• Highway and Infrastructure Asset Management Highway and Public Realm Design
What are SuDS and how can they improve drainage?
About Metis
SuDS are drainage features designed to manage surface water using natural principles
InfiltrationEvaporationEvapotranspirationConveyance to watercourse
What are SuDS and how can they improve drainage?
What are SuDS?
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What are SuDS and how can they improve drainage?
Source Control SuDS
Green roof Permeable surfaces
Rainwater harvesting and
waterbutts
What are SuDS and how can they improve drainage?
Conveyance and Storage SuDS
Tree pits
Filter drain Swale
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What are SuDS and how can they improve drainage?
Benefits of SuDS
Flood risk reduction Water quality and quantity
Air quality improvement Biodiversity Regulate building temperature
What are SuDS and how can they improve drainage?
Wider Benefits of SuDS
Reduce noiseCreate shade
Create community space Recreation opportunities
Educational opportunities
Aesthetic improvements
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Surface water management for now and the future
New developments: Designing sustainability
Existing developments: Flood mitigation
What are SuDS and how can they improve drainage?
Why SuDS?
The Policy – National Planning Policy Framework
What are SuDS and how can they improve drainage?
155. Prevent inappropriate development
165. Major developments should incorporate SuDS
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The Policy – Planning Practice Guidance
What are SuDS and how can they improve drainage?
The Policy – Technical Standards for SuDS
What are SuDS and how can they improve drainage?
Greenfield sites runoff should not exceed greenfield
Brownfield sites runoff should be as close to greenfield as practicable, but not exceed pre-development rate
1 in 30-year rainfall event no flooding
1 in 100-year rainfall event no building flood
>1 in 100-year rainfall event manage exceedance routes.
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The Policy – Regional and Local Policy
What are SuDS and how can they improve drainage?
Sets objectives and actions for managing risk.Prioritise surface water critical drainage areas and mitigation studies.
Flood & Water Management Act: Local Flood Risk Management Strategy
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Our Experience – A view from both sides of the fence
What are SuDS and how can they improve drainage?
PUBLIC
• LLFA statutory role on major planning applications
• Flood risk investigations and hydraulic modelling
• Flood alleviation scheme design
PRIVATE
• Flood Risk Assessments
• Drainage strategies
• Flood risk investigations and hydraulic modelling
• Flood alleviation scheme design
What are SuDS and how can they improve drainage?
Key Principles in Design and Implementation
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What are SuDS and how can they improve drainage?
Key Principles in Design and Implementation
Store rainwater for later use
Infiltration techniques
Attenuation in open water features
Attenuation in sealed water features
Direct discharge into watercourse
Discharge into a surface water sewer
Discharge into a combined sewer
What are SuDS and how can they improve drainage?
SuDS in Sutton’s Schools – Flood Alleviation Scheme
The Problem Difficulties The Solution
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What are SuDS and how can they improve drainage?
Linden Lodge Kennels and Cattery – Drainage StrategyThe Problem Difficulties The Solution
Birches Trading Estate – Flood Alleviation Scheme
What are SuDS and how can they improve drainage?
The Problem Difficulties The Solution
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Tooting & Mitcham United Football Club – Drainage Strategy
The Objective Difficulties The Solution
What are SuDS and how can they improve drainage?
What are SuDS and how can they improve drainage?
Metis service offering
Stakeholder and Community Engagement
SuDS Scheme Identification
Business Case Development
Funding Opportunities & Application Support
Preliminary, Conceptual and Detailed Design
3D Visualisations CDM Regulations
LLFA Statutory Consultee Reviews
Commuted Sums Tools & Investment Modelling
Flood Risk Assessments and Drainage Strategies
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Any questions?Simon Jones
Director
Danielle ParfittSenior Consultant /
Business Performance Lead
[email protected] 948 0249
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Thank you!
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