The Design Tool for Civil
Engineering projects – an
overview
Phil Birch & Susan Steensma
Cyril Sweett
22-09-10
Aim of training session
 Discuss
the background to the ‘Designing out
Waste’ (DoW) process;
 Explain
the role of the tool in helping DoW;
 Demonstrate
how to use the DoW Tool for Civil
Engineering projects (DoWT-CE).
Agenda
Introduction
 What is ‘Designing out Waste (DoW)?’
 Summary of the tool
 Example inputs and outputs
 User guidance
 Design guidance for Civil Engineering projects
 The tool in use
 Q+A

What do you want to
achieve today?
What is ‘Designing out
Waste’ and why is it
important?
Background
Objectives

Benefits of designing out waste

Principles of designing out waste

Designing out waste process

Design guidance and tools
Why take action?

Materials resource efficiency

Landfill tax

Site waste management plans

Environmental assessment

Client benefits
Waste Hierarchy
The role of Designing out
Waste in the overall design
and construction process
Supply chain interfaces
Tendering &
appointment
Model wording
Outline design
Prevent waste
Designing out waste
tools/guidance
Detailed design
Forecast waste
Reduce waste
Increase RC
Net Waste Tool
Construction
Waste reduction
Waste recovery
Measure performance
Post-construction
Review performance
Benchmarking
SWMP Tracker
Reporting Portal
SWMP Template
Pre-construction
The principles of
‘Designing out Waste’
Principles of Designing out Waste
Design for:
1.
Reuse and recovery
2.
Off site construction
3.
Material optimisation
4.
Waste efficient procurement
5.
Deconstruction & flexibility
Design guidance for civil engineering projects
 The design solutions provided within
the tool are in-line with the
recommendations in the Design guide
 Use the guide to evaluate options
The Designing out Waste
Tool for Civil Engineering
projects (DoWT-CE)
DoWT-CE
Users:
 Design team – Civil engineer
When:
 Option preparation and design development stages
Inputs:
 Project elements and approximate dimensions
 Design team thinking on options to design out waste
Outputs:
Tabulated reports on the impact of design solutions on project costs,
materials requirement, wastage and embodied carbon
Cost:
 A short amount of time is needed to complete the analysis (depending on
the project complexity)
 The tool is free to use
Benefits:
 Helps to identify opportunities to reduce the need for imported materials,
minimise wastage and achieve cost savings
 Can be used for options appraisal by comparing different projects scenarios
 Provides input for the project’s SWMP
 Users can include potential savings in tender specification so that tender
prices can take account of design decisions
 Results can be used to demonstrate responsibility
Designing out waste process
Design tool
Produce an indicative
waste forecast
Design review workshop
Decide on actions to
reduce waste through
design
Design tool
Enter actions and
calculate impacts
SWMP
Record indicative waste
forecast and waste
prevention actions
Example – Headline results
The engineer used the DoWT-CE to:
• Identify opportunities to Design out Waste
• understand the cost of waste
• set actions to reduce waste arisings
• increase the recovery of waste
Waste
arisings
(t)
Waste to
landfill (t)
Loss of
embodied
CO2 (t)
Recycled
content
CO2 from
transport
(t)
Baseline
10,911
5,455
208
1%
236
Good practice
5,454
2,727
104
36%
n/a
Projected performance
10,845
5,422
117
35%
236
Targeted improvement
66
33
91
34%
0
Explanation of data hierarchy
Element – A fundamental aspect of civil
engineering i.e. earthworks/drainage/etc
Sub Element – An aspect of an element
i.e. a type of drainage option
Component – Sub elements comprise of
a number of components. For example
drainage options would consist of pipe,
bedding, top soil etc (all of which are
components)
DoWT-CE – hands on
User guidance
Brochure
Dataset
Quick start guide
User guide
User process
1)
2)
3)
4)
5)
Build project
Produce baseline results
Investigate opportunities for DoW
Assess impact
Record actions
Designing out waste process
Design tool
Produce an indicative
waste forecast
Design review workshop
Decide on actions to
reduce waste through
design
Design tool
Enter actions and
calculate impacts
SWMP
Record indicative waste
forecast and waste
prevention actions
Access the tool at:
http://dowtce.wrap.org.uk/
Title page
Registration
‘My projects’
‘Project details’
User journey – Project builder
4
5
1
3
2
Designing out waste process
Design tool
Produce an indicative
waste forecast
Design review workshop
Decide on actions to
reduce waste through
design
Design tool
Enter actions and
calculate impacts
SWMP
Record indicative waste
forecast and waste
prevention actions
Design guidance for civil engineering projects
 The design solutions provided within
the tool are in-line with the
recommendations in the Design guide
 Use the guide to evaluate options
Designing out waste process
Design tool
Produce an indicative
waste forecast
Design review workshop
Decide on actions to
reduce waste through
design
Design tool
Enter actions and
calculate impacts
SWMP
Record indicative waste
forecast and waste
prevention actions
User journey – Solutions and impacts
5
6
4
1
2
3
7
8
Reporting
Designing out waste process
Design tool
Produce an indicative
waste forecast
Design review workshop
Decide on actions to
reduce waste through
design
Design tool
Enter actions and
calculate impacts
SWMP
SWMP
Record
Record indicative
indicative waste
waste
forecast
forecast and
and waste
waste
prevention
prevention actions
actions
Sketches of examples
Highways
300
500
H=4
Embankment + nailing
Filter drain
2
Footpath
10
Highway
Emb
wall
H=4
Cutting + wall
H=1.5
10 x gulleys
Footpath
2
100
Embankment stabilised
Filter drain
400
H=1.5
Cutting + wall
300
1,000
H=4
H=4
Sketches of examples
Streetworks
200
3
Footpath
6
Road
Footpath
10
Square
30
170
3
Sketches of examples
Railways
Cutting 1:2 Pre Cast Concrete retaining wall
Traditional front wall platform
Track on concrete sleepers
Track on concrete sleepers
Filter drain
Traditional front wall platform
Cutting 1:3
Structural steel bridge
Filter drain
RC foundation
RC foundation
RC foundation
Q&A