pipe route

7/29/2019 pipe route

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Proposed 500mm/300mm Diameter NEWater Pipelinesfrom Bras Basah Road To Sports Hub and Bendemeer

FINAL PIPELINE ROUTING ANALYSIS REPORT

TABLE OF CONTENTS

1.0 INTRODUCTION .................................................................................................................1

1.1 Background ......................................................................................................................1

1.2 Purpose .............................................................................................................................4

1.3 Project Description ...........................................................................................................4

2.0 ROUTE SELECTION ..........................................................................................................6

2.1 Methodology ....................................................................................................................6

2.2 General Alignment Considerations...................................................................................6

2.3 Exclusion ..................................................................................6

2.4 Evaluation Criteria ...................................................................................................7

2.4.1 Customer Connection .............................................................................................72.4.2 Constructability ......................................................................................................9

2.4.3 Clearance/Permit from Relevant Competent Authorities .......................................9

2.4.4 Schedule Compliance .............................................................................................9

2.4.5 Construction Cost ...................................................................................................9

3.0 ALTERNATIVE ALIGNMENTS .................................................................................10

3.1 Description of Alignments .............................................................................................10

3.2 Evaluation of Alignments ...............................................................................................11

4.0 CONCLUSIONS AND RECOMMENDATIONS ............................................................16

APPENDIX A SITE PHOTOS

APENDIX B MISCELLANEOUS

LIST OF FIGURES

Figure FIG. 1a Original Proposed Alignment .............................................................................2

Figure FIG. 1b Original Proposed Alignment Aerial View ........................................................3

Figure FIG. 2 Project Location .................................................................................................5

Figure FIG. 3 Alternative Alignment A1 .................................................................................12





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1.0 INTRODUCTION

1.1 BackgroundIn the continuing effort to increase the use of NEWater for non-potable use, the Singapore

Public Utilities Board (PUB) is planning to expand and extend the existing NEWater

supply network to meet the demands from the proposed Sports Hub (when completed) and

the growing demands for NEWater from existing/new commercial/industrial

establishments/developments along Beach Road, Kallang and Bendemeer areas,

PUB has called for consultancy services in the engineering studies, detailed planning,

design, supervision and management of the construction and commissioning for the

Proposed 500mm/300mm Diameter NEWater Pipelines from Bras Basah Road to

Sports Hub and Bendemeer and the contract was awarded to Fong Consult Pte Ltd

(FCPL).

In laying out the process for finalising the pipeline route, FCPL started by looking at the

originally proposed pipeline alignment (Figures FIG.1a & FIG.1b). However, preliminary

consultation with the Land Transport Authority (LTA) revealed that segment of the

proposed pipelines routed along Kallang Avenue was found to be within the protection

reserveof the Singapore Underground Road System (SURS) and LTA commented that the

proposed pipelines shall be realigned to avoid encroachment into the SURS protection

reserve.

In light of the abovementioned key restriction and other possible constrictions (such as

conflicts with underground utilities/structures, constructability issues etc), potential

pipeline corridors, primarily to avoid the SURS protection reserve within this area, have

been explored and alternative alignment options were developed, considered and evaluated.


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FIG.1A


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SportsHubU?C

FIG. 1b ORIGINAL PROPOSED ALIGNMENT AERIAL VIEW


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1.2 PurposeThe purpose of this report is to describe the pipeline route selection methodology

employed to select the final alignment for the construction of the proposed NEWater

pipeline project.

The study was conducted by FCPL to identify and recommend the feasible final pipeline

alignment.

1.3

Project Description

The proposed NEWater pipelines consist of 500mm/300mm diameter distribution

pipelines to extend the current supply network to serve the proposed Sports Hub and

existing / potential users in Beach Road, Kallang and Bendemeer areas.

The project includes supply, delivery, laying, testing and commissioning of the NEWater

pipelines, appurtenances and associated ancillary works.

The whole project is to be completed in two phases. Phase 1 works involve connection

and commissioning of NEWater supply to the proposed Sports Hub is scheduled to be

completed within 18 months to meet the opening of the Sports Hub in April 2014whilstthe whole project is scheduled to be completed within 24 months from the commencement

date of the project construction contract.

The proposed pipelines start from Beach Road, near to the junction with Bras Basah Road,

where the point of connection to the supply source located. The proposed pipelinescorridor of interest are; the commercial establishments/developments along Beach Road,

which runs through three areas, i.e. the Downtown Core, the Rochor and Kallang Areas of

the Central Region; the Kallang Riverside development, the proposed Sports Hub and the

existing industrial estates / new industrial park developments at Lavender, Kallang and

Bendemeer areas. Location of the project area is shown in Figure 2. Due to the unique

geographical location of this region which is bounded by waterways, it is inevitable that

segments of the proposed pipelines will need to be routed across the Rochor and Kallang

River in order to reach it intended destinations.


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FIG. 2 PROJECT LOCATION


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2.0 ROUTE SELECTION

2.1 Methodology

The alternative pipeline alignments were evaluated using the criteria established in Section

2.4 to determine the preferred route.

In general, the considerations taken to select the final route include avoiding sensitive

utilities/ buildings/structures and conversation areas; reducing disturbance to the

traffic/stakeholders, compliance with engineering /construction/relevant competent

authorities/agencies requirements and meeting the budget, completion date and economicbenefits of this project.

2.2 General Alignment Considerations

In most cases, the proposed pipeline shall be laid in Public Streets and aligned within the

Road Reserve.For laying of pipelines in public streets, the installation is normally by open

trench method. At major river/canal crossing and crossing of major road with high traffic

volume where installation by open trench method is infeasible, trenchless construction

such as pipe jacking method is employed to install the pipeline across.

2.3 Exclusion

The following segments of the proposed alignments are not included for alternative

alignment consideration;

i) Proposed alignment along Beach Road - As the points of connection along BeachRoad contribute substantially to the overall demands, the segment of the proposed

pipelines routed along Beach Road is therefore not included for alternative alignment

consideration.

ii) Proposed 300mm diameter pipelines connect to the constructed pipeline alongStadium Link which were laid in advance in conjunction with the Kallang Riverside

Development infrastructure works. The pipeline alignment along this segment is

therefore final.

Hence, the areas focus for potential alternative alignments considerations are Crawford

Street, Kallang, Lavender, Boon Keng and Bendemeer areas.


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2.4 Evaluation Criteria

2.4.1 Customer Connection

i) Proximity to Existing Users

This criterion is used to evaluate the proximity of the proposed route to the

existing users. An existing user is a current customer who can be converted to

NEWater from potable water.

ii) Proximity to Future Users

This criterion is used to evaluate the proximity of the proposed route to

planned development which could utilize NEWater to minimize its new

demands on the potable water system.

2.4.2 Constructability

i) Utility ConflictsExisting utility mapping and field verifications by means of site

reconnaissance and conducting of trial holes are used to identify areas that

might have major utility conflicts that could impact constructability. Over

ground utilities/ structures and existing or planned major underground services

are identified along each potential pipeline alignment.

ii) Clearance from Existing Bridge StructureIn accordance with LTA requirement, the proposed pipeline shall maintain a

minimum horizontal clearance of 10m from the edge of existing vehicular

bridge structure. Existing vehicular bridge structural are identified along each

potential pipeline alignment.

iii) Proximity to Existing/Planned Underground Road/Rail InfrastructureThe proposed pipelines shall avoid laying in close proximity to existing and

planned underground road/rail infrastructures such as the existing Crawford

underpass, KPE and the proposed N-S Expressway, SURS, DTL3 etc.


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iv) Proximity to Existing Building/ StructureThe construction of the proposed pipelines shall avoid laying in close

proximity to existing building and structures.

v) Proximity to Protected/Conservation AreasThe construction of the proposed pipelines shall avoid laying in close

proximity to conservation areas such as Crawford Bridge and protected areas

such as the substation etc.

vi)

Proximity to TreeTrees along the potential pipeline alignments are mapped and categorized.

Alignment in proximity to trees is not preferable and shall be avoided

because construction activities associated with pipeline installation around

trees require clearances and is slower. Additional cost incurred if felling and

transplant of tree is required.

vii) Road ConditionThe road condition along the alignments is to be noted. Alignments that

require opening of newly constructed/resurfaced road shall be avoided.

viii) Viable Traffic Diversion ImplementationAs the project is located in densely built up urban areas, potential conflicts

between traffic and construction is anticipated. The construction is more

accomplishable if traffic can be diverted.

ix) Adequate Space for Construction Work AreaThe proposed pipelines shall lay in location with adequate space for the

required construction work areas and operations so that works can be carried

out safely with minimal inconvenience to the stakeholders, road-users and

general public affected by the works.

The nominal work space width required for open trench pipelaying is 3.3 m

on the assumption of using a 2.5m wide excavator and dump truck. The


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nominal trench width is conservatively assume at 1.5m/1.3m for

500mm/300mm diameter pipe respectively.

The dimension for shaft related to pipe jacking is assume at a maximum of

4m x 8m.

x) Overlap with Other Public Works ProjectsAlignments that overlap with other public works projects such as road

widening, infrastructure development project etc. provide an opportunity to

reduce the cost and disturbance associated with both projects so long as good

coordination is establish. In this respect, alignments that overlap with other

public works projects are deemed preferable to those that do not.

2.4.3 Clearance/Permit from Relevant Competent Authorities / Agencies

Obtaining the required clearances/permits for construction from the relevant

competent authorities/agencies for the alignments is crucial otherwise the

alignment would be considered not practicable. Alignments that within road serve

that minimize the need for long-lead time permits are preferable to those that

require additional permitting effort.

2.4.4 Schedule Compliance

This criterion is used to assess whether Phase 1 of the Project can complete within

Eighteen (18) calendar months from the commencement date of the project

construction contract otherwise the alignment would not be practical.

2.4.5 Construction Cost

This criterion is used to assess projected construction costs, which comprise the

cost to construct conveyance facilities necessary to deliver NEWater to the

customers. These facilities include pipelines and appurtenances.

Pipeline costs vary by the overall length of pipeline required by the given

alignment. Shorter routes are preferable to longer routes. Major under crossings are

identified for each alignment, because these add considerable construction costs

for that alignment.


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3.0 ALTERNATIVE ALIGNMENTS

A total of four alternative alignment options (A1, A2, A3 and A4) at Crawford Street,

Kallang, Lavender, Boon Keng and Bendemeer areas were developed (FIG.3 to FIG. 6).

3.1 DESCRIPTION OF ALIGNMENTS

In general, the alternative alignments, as compared to the original proposed alignment,

were developed primarily to avoid the SURS Protection Reserve which conflicts with the

segments of pipeline that run along Kallang Avenue, Kallang Junction, Boon Keng Road

and Bendemeer Road in the original proposed alignment.

i) Alternative A1

The proposed alternative alignment is to route the pipelines from Kallang Road to

Lavender Street and run along Lavender Street, detour to Bendemeer Road and

terminate at Boon Keng Road and Bendemeer Road near the Micron Building.

Please refer to figure Fig. 3 for details.

ii) Alternative A2

The proposed alternative alignment is to route the pipelines along Crawford Street

after turning from Beach Road, run across the Crawford Bridge and across the

junction with Kallang Road/Lavender Street and align the pipelines along

Lavender Street, detour to Bendemeer Road and terminate at Boon Keng Road and

Bendemeer Road near the Micron Building. Please refer to figure Fig. 4 for details.

iii) Alternative A3

The proposed alternative alignment is to route the pipelines along the river bank of

Kallang Riverside Park after crossing the Rochor River. The pipelines branch-off

northbound and southbound near Sir Arthurs Bridge. The southbound pipelines to

Sports Hub follow the original proposed alignment. The Northbound pipelines cut

across Kallang Road, run along the river bank of Kallang River, route along Boon

Keng Road and detour to Bendemeer Road and terminate near the Micron Building.

Please refer to figure Fig. 5 for details.


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iv) Alternative A4The proposed alternative alignment is to branch-off the pipelines after crossing

Kallang River. The southbound pipelines to Sports Hub follow the original

proposed alignment. The Northbound pipelines run along Geylang Road, detour to

Geylang Lorong 1, run along Boon Keng Road to Bendemeer Road and terminate

near the Micron Building. Please refer to figure Fig. 6 for details.

3.2 EVALUATION OF ALIGNMENTS

The rating scale for each criterion is established as follows;

Scale Definition

1 Undesirable / Impractical

2 Moderate

3 Acceptable

4 Desirable / Practical

The criticality and priority of each criterion is weighted equally.

Summary of alternative alignment Evaluation is tabulated as below;

Table 1 Rating

Clause Criteria A1 A2 A3 A4

2.4.1 Customer Connection

i) Proximity to Existing Users 3 3 2 2ii)Proximity to Future Users 4 4 2 2

2.4.2 Constructability

i) Utility Conflicts 3 3 2 2ii) Clearance from Existing Bridge Structure 2 1 2 2iii) Proximity to Existing/Planned

Underground Road/Rail Infrastructure

2 2 2 2

iv) Proximity to Existing Building/ Structure 3 3 2 3v) Proximity to Protected/Conservation Areas 4 1 4 4vi) Proximity to Tree 3 3 1 3vii)Road Condition 3 3 3 3viii)Viable Traffic Diversion Implementation 2 2 3 3ix) Adequate Space for Construction Work Area 3 3 3 3x) Overlap with Other Public Works Projects 3 3 2 2

2.4.3 Clearance/Permit from Relevant Competent

Authorities/Agencies

2 1 1 2

2.4.4 Schedule Compliance 3 2 2 2

2.4.5 Construction Cost 3 3 3 3

Average Rating 2.87 2.47 2.27 2.53


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4.0 CONCLUSIONS AND RECOMMENDATIONS

The routing analysis consisted of evaluating pipeline alignments based on the criteria

defined in Section 2.4 in the areas as highlighted in this report.

The evaluation included site reconnaissance, conducting of trial holes to identified

utilities/services conflicts and desktop analysis. Potential pipeline corridors were

identified and four alternative alignment options were developed for consideration and

evaluation.

Following is the tabulation of the average overall rating of the alternative alignmentsevaluation;

Alternative

Alignment

Average

Overall

Rating

Ranking

A1 2.87 1

A2 2.47 3

A3 2.27 4

A4 2.53 2

Based on the evaluation and the final scoring, the final preferred alignment, Alternative

A1, is recommended to deliver NEWater to the proposed Sports Hub, Beach Road,

Kallang and Bendemeer areas.

Although there are still pending authorities clearances for the selected final preferred

alignment, it is however anticipated that major changes to the final preferred route are not

likely as it has been assessed to be more feasible amongst the alternative alignment options

explored. Nevertheless, minor amendments to the alignment to improve localised

outcomes are expected. As these changes are assessed, investigated and approved,

subsequent revisions to the final preferred alignment will be made.

A separate report, document no. FC/PUB/PSK/1125/HS/001, on hydraulic modeling was

performed on the final preferred alignment to optimize pipe diameters for the distribution

pipes.

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