SUDS: Innovation or a Tried and SUDS: Innovation or a Tried and - - PowerPoint PPT Presentation

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SUDS: Innovation or a Tried and SUDS: Innovation or a Tried and Tested Practice? Tested Practice?

• Anthony Kirby

Anthony Kirby

• Entered in ICE Papers

Entered in ICE Papers Competition 2003 Competition 2003

• Winner of James Forrest

Winner of James Forrest Medal in Nov 2004 Medal in Nov 2004

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Scope of Presentation Scope of Presentation

• SUDS principles

SUDS principles

• SUDS overview

SUDS overview

• SUDS: The Issues

SUDS: The Issues

• Recent Progress

Recent Progress

• SUDS in Scotland

SUDS in Scotland

• Comparisons to ancient

Comparisons to ancient water harvesting water harvesting

• Summary: Are SUDS

Summary: Are SUDS really innovative really innovative solutions? solutions?

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SUDS: An Overview SUDS: An Overview

Principles Principles

• SU

SUstainable stainable D Drainage rainage S Systems ystems

• Mimic natural drainage

Mimic natural drainage processes processes

• Protect or enhance

Protect or enhance water quality water quality

• Sympathetic to the

Sympathetic to the environmental setting environmental setting

• Equal consideration to:

Equal consideration to:

• Quantity

Quantity

• Quality

Quality

• Amenity

Amenity

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SUDS: An Overview SUDS: An Overview

Effect of Urbanisation on Storm Hydrograph Effect of Urbanisation on Storm Hydrograph

Flow

Time

Peak Flow Increases Time to Peak Decreases Volume Increases Base Flow Decreases

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SUDS: An Overview SUDS: An Overview

Surface Water Management Train Surface Water Management Train

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SUDS: An Overview SUDS: An Overview

Devices Devices

• Swales

Swales

• Conveyance

Conveyance

• Basins and ponds

Basins and ponds

• Attenuation basins

Attenuation basins

• Retention Ponds

Retention Ponds

• Infiltration devices

Infiltration devices

• Soakaways

Soakaways

• Infiltration Basins

Infiltration Basins

• Permeable surfaces

Permeable surfaces

• Grass

Grass

• Permeable paving

Permeable paving

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SUDS: The Issues SUDS: The Issues

Design Criteria and Guidance Design Criteria and Guidance

• Selection and suitability

Selection and suitability

• Source control techniques generally preferred

Source control techniques generally preferred

• Solution should be inspired by the natural drainage

Solution should be inspired by the natural drainage pattern of catchment pattern of catchment

• Water companies actively encouraging SUDS where

Water companies actively encouraging SUDS where appropriate, but responsibility does not stop with appropriate, but responsibility does not stop with them them

• Mind set still focused on conventional pipe systems in

Mind set still focused on conventional pipe systems in England and Wales England and Wales

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SUDS: The Issues SUDS: The Issues

Adoption Adoption

• Main stumbling block to implementation of SuDS in

Main stumbling block to implementation of SuDS in England and Wales England and Wales

• Legislative framework phrased around conventional

Legislative framework phrased around conventional systems systems

• Not easily interpreted to include SuDS type solutions

Not easily interpreted to include SuDS type solutions

• No

No “ “SuDS For Adoption SuDS For Adoption” ” document document………… …………yet! yet!

• SUDS Matrix in Wales

SUDS Matrix in Wales

• Operation and maintenance risks

Operation and maintenance risks

• Responsibility

Responsibility

• Water Companies?

Water Companies?

• Local Authorities?

Local Authorities?

• Environment Agency?

Environment Agency?

• Developers/Owners?

Developers/Owners?

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Recent Progress Recent Progress Guidance Guidance

• SUDS Interim Code of Practice supersedes

SUDS Interim Code of Practice supersedes ‘ ‘Framework for SUDS Framework for SUDS’ ’ – – National SUDS Working National SUDS Working Group Group

• CIRIA 609

CIRIA 609 – – advice on the design and construction of advice on the design and construction of SUDS SUDS

• CIRIA 522

CIRIA 522 – – Design Manual for England and Wales Design Manual for England and Wales

• CIRIA 523

CIRIA 523 – – SUDS Best Practice Manual SUDS Best Practice Manual

• CIRIA 625

CIRIA 625 – – Model Agreements for SUDS Model Agreements for SUDS

• SUDS Working Party for Wales

SUDS Working Party for Wales – – SUDS Matrix SUDS Matrix

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Hangars and Support Building Attenuation Basin Receiving Watercourse Site SW Outfall Oil Separator Overflow to Basin

Project Red Dragon

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Project Red Dragon Project Red Dragon

Basin Operation Principles Basin Operation Principles

• Provides a Site Control

Provides a Site Control

• Basin is dry under normal flow conditions

Basin is dry under normal flow conditions

• During higher flow rates, orifice plate in

During higher flow rates, orifice plate in manhole only allows GFR to pass to outfall manhole only allows GFR to pass to outfall

• All excess flow passes to basin for attenuation

All excess flow passes to basin for attenuation

• As flow rates reduce, attenuated storm water

As flow rates reduce, attenuated storm water gravitates to outfall in controlled manner gravitates to outfall in controlled manner

• Reduces the risk of flooding in receiving

Reduces the risk of flooding in receiving watercourse. watercourse.

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SUDS In Scotland SUDS In Scotland

Lessons to be Learnt? Lessons to be Learnt?

• Approximately 1000 SuDS

Approximately 1000 SuDS implemented since 1993 implemented since 1993

• Effect of urbanisation on

Effect of urbanisation on pollution of Scottish rivers pollution of Scottish rivers recognised recognised

• Potential of SuDS identified

Potential of SuDS identified

• Research and monitoring

Research and monitoring programmes well advanced programmes well advanced

• Proper

Proper “ “partnership partnership” ” between between SEPA and Water Authorities SEPA and Water Authorities

• SUDS

SUDS “ “will will” ” be adopted be adopted

• Scottish Parliament have

Scottish Parliament have powers to pass laws powers to pass laws

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SUDS In Scotland SUDS In Scotland

Problems Overcome Problems Overcome

• Experienced similar difficulties ten years ago as

Experienced similar difficulties ten years ago as England and Wales are today England and Wales are today

• Little information on performance, maintenance and

Little information on performance, maintenance and whole life costs of schemes whole life costs of schemes

• Confusion led to formation of SUDS Scottish Working

Confusion led to formation of SUDS Scottish Working Party in 1997 Party in 1997

• Framework agreement and design manual developed

Framework agreement and design manual developed

• SUDS now an integral part of planning policy in many

SUDS now an integral part of planning policy in many areas areas – – MIND SET MIND SET

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Learning From Scotland Learning From Scotland The Welsh Perspective The Welsh Perspective

SUDS Working Party for Wales SUDS Working Party for Wales

• Limited number of Stakeholders:

Limited number of Stakeholders:

• One Road Authority

One Road Authority – – The Welsh Office The Welsh Office

• One Water Company

One Water Company – – DCWW DCWW

• One Assembly

One Assembly

• One EA Region

One EA Region

• In England, things are more complex as there are many

In England, things are more complex as there are many interested parties. interested parties.

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SUDS SUDS……………… ……………….. ..

Are we simply reinventing the wheel? Are we simply reinventing the wheel?

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Water Harvesting in Negev Desert Water Harvesting in Negev Desert

An Early Form of SUDS? An Early Form of SUDS?

• Techniques of water harvesting around 4000 years old

Techniques of water harvesting around 4000 years old

• Collection, storage and conservation of runoff to sustain life

Collection, storage and conservation of runoff to sustain life

• First imperative of desert settlement

First imperative of desert settlement

• Small catchment areas and low water volume

Small catchment areas and low water volume

• Permanent rivers almost absent

Permanent rivers almost absent

• Annual rainfall varies between 25mm and 200mm

Annual rainfall varies between 25mm and 200mm

• Collection of water from sloping ground

Collection of water from sloping ground

• Conveyance

Conveyance

• Rainwater collected by use of cisterns

Rainwater collected by use of cisterns

• Artificially constructed reservoirs

Artificially constructed reservoirs

• Early cisterns crude and inefficient but developed

Early cisterns crude and inefficient but developed

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Water Harvesting in Negev Desert Water Harvesting in Negev Desert

Comparisons to SUDS Techniques Comparisons to SUDS Techniques

• Conveyance to cisterns

Conveyance to cisterns

• Catchment understood for

Catchment understood for strategic location of cisterns strategic location of cisterns

• Mimic natural drainage

Mimic natural drainage patterns patterns

• SUDS build on water

SUDS build on water harvesting principles by harvesting principles by consideration of quality and consideration of quality and amenity amenity

• Modern rainwater harvesting

Modern rainwater harvesting techniques techniques – – re re-

• use of

use of ‘ ‘grey grey water water’ ’

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Innovation Innovation…… …… or a Tried and

• r a Tried and

Tested Practice? Tested Practice?

• SUDS build on principles that are over 4000 years old

SUDS build on principles that are over 4000 years old

• Use of old technology in a modern strategy

Use of old technology in a modern strategy

• Solution is based on natural drainage pattern

Solution is based on natural drainage pattern

• Schemes successfully implemented in UK

Schemes successfully implemented in UK

• Barriers have been overcome

Barriers have been overcome

• Common goal

Common goal

• Working together

Working together

• Research and monitoring will provide greater

Research and monitoring will provide greater understanding of systems understanding of systems

• Better guidance required

Better guidance required

• Clarity of responsibility

Clarity of responsibility

• Sustainability for the future

Sustainability for the future…………………………………… ……………………………………

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Thank You! Thank You!