4.1

CHAPTER 4

PROJECT DESIGN AND ESTIMATES

Rev Issue Date Amendment Incorporated

First Issue September 2008 1 14 November 2008 Amendment No. 2/2008 2 30 March 2009 Amendment No. 3/2009 3 24 June 2009 Amendment No. 6/2009 4 2 September 2009 Amendment No. 8/2009 5 18 December 2009 Amendment No. 12/2009 6 11 January 2010 Amendment No. 1/2010

2008 Edition

The parts of the PAH shown in blue and boldshould only be updated by Works Branch ofDevelopment Bureau. Amendment No. 3/2009

4.2 2008 Edition

SYNOPSIS

This Chapter describes the criteria to be adopted, the procedures to be followed and the documentation that is required in the design process of civil engineering works. Emphasis is placed on the need to adopt a systematic approach, from the initial stage of conceptual design to the final stage of checking and certification, to ensure that designs are performed and recorded properly. Requirements for cost estimates and general guidance on their preparation are also described.

The procedures and documentation requirements set out in the Chapter are generally applicable to all public works projects involving civil engineering construction. However, for emergency works where there is a serious time constraint and for minor works where standard designs are used, the procedures may be applied selectively if this is necessary to avoid unnecessary delays to the Works or the production of over-elaborate documentation.

Detailed guidance on the standards and methods to be adopted for the design of works is not given in this Chapter and reference should be made to standard textbooks, codes of practices and other manuals quoted in the text.

4.3 2008 Edition

CONTENTS

Page No.

I ABBREVIATION 4.8 II GLOSSARY OF TERMS 4.12 1. GENERAL CONSIDERATIONS FOR DESIGN 4.13 1.1 AUTHORITY 4.13 1.2 RESOURCES 4.13 1.3 DESIGN OBJECTIVES 4.13 1.4 METHODOLOGY 4.14 1.5 DRAWINGS 4.15 1.5.1 Organization 4.15 1.5.2 Standards 4.15 1.5.3 Numbering 4.15 1.5.4 Preparation 4.16 1.5.5 Circulation 4.16 1.5.6 Checking and Approval 4.16 1.6 SITE INVESTIGATION 4.16

2. PRELIMINARY STAGE OF DESIGN 4.19 2.1 PRELIMINARY DESIGN 4.19 2.2 SELECTION OF BASIC SCHEME & LIFE-CYCLE

COSTING CONSIDERATION 4.19

2.3 COMPILATION OF DESIGN MEMORANDUM 4.20 2.4 CHECKING AND APPROVAL OF DESIGN

MEMORANDUM 4.20

2.5 GENERAL LAYOUT PLAN 4.20 2.5.1 Preparation 4.20 2.5.2 Circulation 4.21 2.5.3 Checking and Approval 4.21

4.4 2008 Edition Page No.

3. DETAILED DESIGN AND ASSOCIATED

ADMINISTRATION 4.22

3.1 CHECK LIST FOR DETAILED DESIGN 4.22 3.2 DESIGN CALCULATION FILE 4.22 3.3 DESIGN CALCULATIONS 4.23 3.3.1 Format 4.23 3.3.2 Presentation 4.23 3.3.3 Contents 4.23 3.3.4 Standard Designs 4.23 3.3.5 Designs Similar to Previous Projects 4.23 3.3.6 Computer Analysis 4.23 3.3.7 Survey Data and Computation Files 4.24 3.3.8 Drawing List 4.24 3.3.9 Signing of Design Calculations 4.24 3.3.10 Arithmetical Checks of Design Calculations 4.24 3.4 DESIGN RECORDS 4.25 3.4.1 Permanent Design Records 4.25 3.4.2 Design Not 4.25 3.4.3 Checking of Design Records 4.25 3.4.4 Submission of Site-specific Geotechnical Reports to the

Geotechnical Information Unit (GIU) (Amendment No. 1/2010)

4.26

3.5 CERTIFICATION AND CHECKING AND AUDITING OF DESIGN PROCESSES

4.27

3.6 REVISION OF DESIGN CALCULATIONS, RECORDS

AND DRAWINGS 4.28

3.7 DESIGNS BY CONSULTING ENGINEERS 4.28 3.8 DESIGNS BY AND FOR OTHERS 4.29 3.9 THE REASSIGNMENT OF ACTIVE PROJECTS 4.29

4. GUIDELINES AND POLICIES RELATED TO DESIGN 4.30 4.1 SITE FORMATION AND RECLAMATION 4.30 4.1.1 Fill Matters 4.30 4.1.2 Submission to GEO 4.30 4.1.3 Construction and Demolition Materials 4.30 4.2 MARINE WORKS 4.33

4.5 2008 Edition Page No.

4.3 HIGHWAYS AND ASSOCIATED STRUCTURES 4.33 4.3.1 Road Pavements, Exclusive Highway Drainage, Railings,

Barrier Fences and Parapets 4.33

4.3.2 Structures 4.33 4.3.3 Highway Alignment and Traffic Management 4.34 4.3.4 Road Lighting and Other Illuminated Traffic Aids 4.34 4.3.5 Road Safety 4.35 4.3.6 Tactile Guide Path 4.35 4.3.7 Street Name Plates 4.35 4.4 SEWERAGE AND DRAINAGE 4.35 4.5 WATERWORKS 4.36 4.6 GEOTECHNICAL WORKS 4.37 4.6.1 Technical References 4.37 4.6.2 Geotechnical Submissions to GEO 4.37 4.6.3 Foundation Works in the Designated Areas/Scheduled

Areas 4.39

4.6.4 Projects Incorporating Ground Anchors 4.40 4.6.5 Projects Incorporating Permanent Reinforced Fill

Structures 4.40

4.6.6 Projects Incorporating Horizontal Drains 4.40 4.6.7 Restrictions on the Use of Hand-dug Caissons 4.40 4.6.8 Projects Involving Man-made Slopes and Retaining

Walls 4.41

4.6.9 Projects Involving Natural Slopes 4.44 4.6.10 Water-carrying Services Affecting Slopes 4.43 4.6.11 Prescriptive Measures for Stabilisation and Improvement

of Man-made Slopes and Standardised Debris-resisting Barriers for Mitigation of Natural Terrain Landslide Hazards

4.45

4.6.12 Projects Involving Blasting 4.46 4.7 LANDSCAPING AND GREENING WORKS 4.47 4.8 BUILDINGS 4.47 4.9 ELECTRICAL AND MECHANICAL WORKS 4.48 4.10 COMPUTER SYSTEMS 4.48 4.11 GREENHOUSE EFFECT 4.48 4.12 AESTHETICS 4.48

4.6 2008 Edition Page No.

4.13 ENVIRONMENTAL PROTECTION 4.49 4.14 WORKS BY OTHER GOVERNMENT DEPARTMENTS/

ORGANISATIONS 4.51

4.15 ADJACENT PROPERTY 4.52 4.16 UTILITIES 4.52 4.17 PUBLIC TRANSPORT 4.53 4.18 SURVEY MONUMENTS AND MARKS 4.53 4.19 INFRASTRUCTURE ON NEW RECLAMATION

4.20 HERITAGE IMPACT

4.53 4.54

5. ESTIMATES 4.55 5.1 INTRODUCTION 4.55 5.2 DESCRIPTION 4.56 5.3 TIMING 4.57 5.4 PREPARATION 4.57 5.5 RECURRENT COST ESTIMATES 4.60 5.6 REPORTING 4.61 5.6.1 Capital Works 4.61 5.6.2 Recurrent Costs 4.61

6. REFERENCES 4.63 APPENDICES APPENDIX 4.1 CHECK LIST FOR DETAILED DESIGN 4.70 APPENDIX 4.2 EXAMPLES OF EXPLANATORY

MEMORANDUM/LETTER USED FOR THE CIRCULATION OF THE GENERAL LAYOUT PLAN

4.74

APPENDIX 4.3 CERTIFICATION BY PROJECT ENGINEER AND 4.78

4.7 2008 Edition Page No.

CHECKING OFFICER

APPENDIX 4.4 ESTIMATE DESCRIPTION 4.79 APPENDIX 4.5 LIST OF SOME RELEVANT AUTHORITIES 4.80 APPENDIX 4.6 EXAMPLES OF DESIGN MEMORANDUM 4.82 APPENDIX 4.7 CONTENTS OF A BLASTING ASSESSMENT 4.89 APPENDIX 4.8 LIST OF CONSTITUENTS OF SUBMISSION ON

GEOTECHNICAL WORKS 4.91

APPENDIX 4.9 GUIDELINES FOR PREPARATION OF

CONSTRUCTION AND DEMOLITION MATERIAL MANAGEMENT PLAN

4.93

APPENDIX 4.10 DEPARTMENTAL CONSTRUCTION AND

DEMOLITION MATERIAL VETTING COMMITTEE SUGGESTED COMPOSITION AND TERMS OF REFERENCE

4.95

APPENDIX 4.11 GUIDELINES FOR MINIMISING THE GENERATION AND MAXIMISING THE USE OF CONSTRUCTION AND DEMOLITION MATERIALS

4.96

APPENDIX 4.12 FLOW CHART FOR VETTING OF EIA / ER

REPORT 4.97

APPENDIX 4.13 TECHNICAL GUIDANCE ON THE USE OF HAND-

DUG CAISSONS 4.98

APPENDIX 4.14 VARIOUS USES OF HARDWOOD ON

CONSTRUCTION SITES AND SOME SUGGESTIONS FOR ALTERNATIVES

(Amendment No. 2/2008)

4.100

APPENDIX 4.15 ESTIMATING USING RISK ANALYSIS (ERA)

PRACTICE NOTE (Amendment No. 2/2008)

4.103

APPENDIX 4.16 GEO Checking Certificate for Slopes and Retaining Walls

4.128

APPENDIX 4.17 Certificate of Design and Completion of Slopes and Retaining Walls involving designs/stability assessments carried out by the Project Department or its Consultants

4.129

4.8 2008 Edition Page No.

APPENDIX 4.18 Certificate of Design and Completion of Slopes and Retaining Walls for Design & Build Contracts (Sheet 1 of 5)

4.137

APPENDIX 4.19 Certificate of Design and Completion of Slopes and Retaining Walls involving Contractors Design in works contracts other than Design & Build Contracts (Sheet 1 of 3)

(Amendment No. 1/2010)

4.142

4.9 2008 Edition

I. ABBREVIATION I.01 The meaning of the abbreviations assigned in this Chapter of the Project

Administration Handbook for Civil Engineering Works shall only apply to this Chapter.

I.02 The following list shows the meaning of the abbreviations for the common terms used in this Chapter of the Project Administration Handbook for Civil Engineering Works:

Abbreviation Term

ACABAS Advisory Committee on the Appearance of Bridges and Associated Structures

ACSA Anchor Certification System for Permanent Prestressed Ground Anchors

AFCD Agriculture, Fisheries and Conservation Department

AGS Association of Geotechnical and Geoenvironmental Specialist format

APE Arch SD

Approved Project Estimate Architectural Services Department

BD C of P C&D

Buildings Department Commissioner of Police Construction and Demolition

C&DMMP Construction and Demolition Material Management Plan

CAD Computer-Aided-Drafting CCGO Central Cyber Government Office CE Chief Engineer CE/Design Chief Engineer/Design CE/PW Chief Engineer/Port Works CE/RSS Chief Engineer/Road Safety and Standards CEDD Civil Engineering and Development Department CEO Civil Engineering Office CGE Chief Geotechnical Engineer CGE/GP Chie