Al Marjan Power_Preliminary Report (2)

Al Marjan Islands Development

Stage 1 Schematic Masterplan – Engineering Report

031503

19 February 2013

Revision 00

Buro Happold

Al Marjan Islands Development Revision 00 Stage 1 Schematic Masterplan – Engineering Report 19 February 2013 Copyright © Buro Happold Page 5

Contents

1 Introduction 9

1.1 Al Marjan Islands Project Development 9

1.2 Brief 9

1.3 Programme Period 10

1.4 Scope of Work Covered 10

2 Marine and Coastal Engineering 11

2.1 Marine Works 11

2.2 Marina Design 21

2.3 Sources of information 25

2.4 Summary 25

3 Highways Engineering 27

3.1 Trip Generation and Parking Rates 27

3.2 Highways Engineering 34

3.3 Other opportunities following revised transport estimates 42

4 Utilities Engineering 47

4.1 Introduction 47

4.2 Surface Water Drainage 47

4.3 Foul Water Drainage 51

4.4 Potable Water 55

4.5 Non-potable Water - Irrigation and Fire 65

4.6 Power 70

4.7 Telecommunications and SMART infrastructure 78

5 Inland Waterways 90

5.1 Introduction 90

5.2 Summary of New Canal Proposal 91

5.3 Summary of canal options for each scheme 91

5.4 Summary 92

6 Lighting 93

6.1 Introduction 93

6.2 Summary of Existing or Proposed Infrastructure 93

6.3 Summary of Requirements for New Development 93

6.4 Suitability of existing infrastructure for new development 93

6.5 Items to be replaced, diverted or redesigned 94

Buro Happold


6.6 Summary 94

7 Bridges 95

8 Construction Phasing 97

8.1 Key drivers and considerations 97

8.2 Proposed options 97

8.3 Preferred option 99

9 Summary and Conclusion 100

9.1 Overview of key recommendations 100

9.2 Sustainability 100

9.3 Marine and Coastal Engineering 100

9.4 Highways and Transport 100

9.5 Utilities Engineering 101

9.6 Inland waterways 102

9.7 Lighting 102

9.8 Bridges 102

9.9 Information requested 102

9.10 Next steps 102

Buro Happold


4.6 Power

4.6.1 Introduction

The purpose of this chapter is to summarise progress to date in assessing and identifying how existing Power

infrastructure on site can be used to service the new Masterplan for Al Marjan Island developed by WATG. Alterations to

existing plans or infrastructure and new opportunities will also be identified.

4.6.2 Summary of Existing or Proposed Infrastructure

4.6.2.1 Proposed provision strategy

The Halcrow Masterplan states that 2 No. overhead lines pass near to the site, according to FEWA Electric records, and

this is a possible (and assumed) source of power for the development.

The Halcrow Masterplan recommended 132/33/11KV sub station located on the mainland and HV distributed across the

site at 33KV to minimise cableing. From reviewing Island 4 design proposals received by the Site Engineer and RAK

Investment Authority, it is noted that this option was not approved and so a system of 132/11kV has since been opted for.

The typical road sections include a 132KV High Voltage network in the median of the roads and this will step down at

132/11KV transformers.

4.6.2.2 Demand estimates and key assumptions

Both reports considered the power demands required for the development. The CONSER (2008) report used generally

lower values and it is understood that these values incorporate a reduction due to district cooling, whilst Halcrow did not

propose district cooling.

The table below compares the power benchmarks assumed by each consultant:

Land Use Type Halcrow (VA/m2) CONSER* (W/m

2)

Hospitality Hotels 200 85

Other Leisure 150 110

Residential Villas 120 110

Townhouse 120 -

Apartments 120 55

High Rise 130 55

Commercial Offices / Mixed 140 110

Retail / Commercial 150 110

Public Community Facilities 100 -

Road Corridors / Landscaping 15 20

Open Space 5 20

Beaches 2 20

*District cooling is understood to be applied for all CONSER values except Villas / Open Space

To estimate the cumulated demands at the various points of the distribution network diversity factors are subsequently applied at each level within the system, from individual buildings up to the whole development.

Both reports also applied different diversity factors to the HV supply:

• Halcrow: o 0.9 at 11kV feeder from primary switch gear o 0.656 across the development

• CONSER: o 0.9 at distribution board o 0.9 at sub-main distribution board o 0.9 at main distribution board o 0.8 mechanical and lighting loads o 0.4-0.6 power loads

Estimated Loads

The maximum load from the Halcrow report after applying diversity is 134.6 MVA.

The maximum load from the CONSER report after applying diversity is 219.2 MVA

cksharma

Highlight

cksharma

Highlight

cksharma

Highlight

cksharma

Highlight

Buro Happold


4.6.2.3 Proposed network routes

Power Network

Halcrow propose the network route shown below. The main primary 132/33/11kV substation is located in the mainland

utility plant. The main intake substation shall cover the load at Island 1 and the peninsula. Three primary substations are

then spread across Island 2, 3 and 4.

Figure 86 - Halcrow proposed power network route

The CONSER report opts for direct transformation to 11kV, based on the clients request, from 4 No. 40MVA capacity

132/11kV primary substations. These primary substations are proposed to be located in the Peninsula, Island 1, Island 2,

Island 3 and Island 4. From these, 11kV underground distribution cables will supply the plots with power. The report refers

to drawings MAR/EL/IS4/010 and MAR/EL/IS4/011 for power distribution network schematics however these are not

provided in the report and so are currently unavailable for assessment.

District Cooling

The Halcrow Masterplan did not envisage district cooling within the scheme however it is noted within the typical road

sections (provided in the CONSER Island 4 reports) that a chilled water pipe allowance has been made within the main

roads. The power requirement for the proposed district cooling plant by CONSER is proposed to be taken up separately

by the district cooling provider which is estimated as an additional 5x50MVA* – if district cooling provided across the

whole site, not just Island 4. (*inconsistency - CONSER say 3x50MVA earlier in the report) .

4.6.2.4 Installed or proposed plant, land-take and other considerations

Electrical

• The Site Engineer confirmed that currently no MV or HV power infrastructure has been installed on site. The

power authority will only supply MV when there is a constructed demand.

• The as built drawings available for MV/LV, namely ‘A602-D-ES-I3-0002-6.pdf’ and ‘A602-D-ES-I3-0001-4.pdf’,

contradict the information from the Site Engineer as they show the 11kV network is installed in the

carriageways/footpaths of the highways in Island 3 and part of Island 2.

• The As Built plans show power layouts for Island 3 and part of Island 2 only; it is assumed that this is the only

location where the 11kV power cables and ducting is installed whilst street lighting is thought to be installed

across the whole development. The 132/11kV substation on Island 2 is indicated as ‘future’ and therefore

assumed not yet installed. The main 132kV HV supply line is also not yet constructed.

LED Street Lighting has been installed and tested (approximately 1 year ago) for the new roadways laid to wearing

course across the islands. The associated LV network has also been installed in the footpaths and connected to 11KV

substations. Transformers for the substations have been installed and tested.

The right of way (RoW) for the HV/MV network has been highlighted and safeguarded within the ROW currently built. The

11kV MV networks are installed in the edges of the highways either under the footway or under the parking lane. The

street lighting LV cabling is installed either in the median or the footpath of the highways, depending on the ROW width

and hence location of the street lighting. See below plan:

Figure 87 - CONSER 61.0m ROW Section

cksharma

Highlight

cksharma

Highlight

cksharma

Highlight

Buro Happold


District Cooling

As Built drawings received from the Site Engineer do not indicate chilled water networks however as previously

mentioned, a chilled water pipe allowance has been made within the main ROWs on Island 4. The RAK Design Report

states “As for the District Cooling reservation, it is subject to the construction of a district cooling plant and its final location

on the development.”

A hidden layer on the As Built CAD files indicates a District Cooling network running from the mainland to the end of the

main highway on Island 2. This is not thought to be installed, but should be confirmed before the next stage of the

Masterplan as it may mean that District Cooling is intended (and installed) for Island 1 and 2 developments – BH are

currently proposing only for Island 4 (to be determined).

4.6.2.5 Proposed phasing

No power phasing detail provided.

4.6.3 Summary of Requirements for New Development

4.6.3.1 New assumptions

Item Halcrow 2007 report RAKEEN/ CONSER 2008 – Island 4 part I

WATG / BH Masterplan

No. Substations 1 No. 132kV 3 No. 33/11kV

4 No. 132/11kV

2 No. 132/11kV

11 No. 11/0.4kV Local

Benchmarks Higher than RAKEEN (No DC included)

Lowest (DC reductions included)

Based on previous reports and experience in the region. Similar to Halcrow (before cooling)

Diversity (HV) 0.9 at 11kV feeder from primary switch gear 0.656 across the development

0.9 at distribution board 0.9 at sub-main distribution board 0.9 at main distribution board 0.8 mechanical and lighting loads 0.4-0.6 power loads

0.9 at building level 0.8 at substation 0.9 connected load

Diversified Load 135 MVA 219 MVA 143 MVA

District Cooling No Yes (Island 4) Yes (Island 4)

4.6.3.2 Design codes and criteria

The bodies primarily responsible for regulation, operation and maintenance of the electricity networks in RAK are detailed

below:-

• Federal Electricity and Water Authority (FEWA)

• Ministry of Energy and Natural Resources (MOENR)

It is proposed that the power network is designed and installed to the associated standards and specifications of these

bodies.

4.6.3.3 New demand calculations

Interpretation and benchmarks

A preliminary assessment of electrical loads has been undertaken based on the land use schedule received from WATG.

In the absence of tenant specific demand data for the development, standard benchmarks have been used to estimate

power demands derived from Buro Happold’s previous experience in the region and from regional utilities and district

cooling providers. District cooling is assumed to have a 25% reduction in the power demands in the applicable areas.

The benchmarks used are shown in the table below, note these are for the initial land use descriptors which will be further

refined as the Masterplan develops and therefore the demand analysis is likely to become more detailed at the next stage

of the Masterplan.

Land Use Electrical Benchmark (VA/m2) Applied to

Hospitality 200 BUA

Residential 120 BUA

Commercial 140 BUA

Amenity 100 BUA

Roads + Open Space 15 Land Area

Utilities 200 (to be later refined by specific utilities demands)

Land Area

Table 38- Proposed power benchmarks

Land Use BH - Makany Island

BH - KAEC Halcrow - Al Marjan CONSER* - Al Marjan (incl. District Cooling)

W/m2 VA/m

2 VA/m

2 W/m

2

Hospitality 120 130 200 85

Residential 42 (apt) 35 (workers) - 160 (villa/apt) 120 (villa/apt) - 130 (high rise) 55 (apt) - 110 (villa)

Commercial 140 105 140-150 110

Amenity n/a 100 100 n/a

Roads + Open Space

15 5 2 (beaches) - 15 (road corr) 20

Utilities n/a varied n/a n/a

Table 39 - Benchmarks comparison with previous projects

Diversity

The maximum demand loads are calculated using the below diversity factors multiplied by the total non-coincident

demand. These are based on standards for Abu Dhabi – where British Standard is referenced.

Diversity Factors

Building Diversity 0.9

Substation Diversity 0.8

Connected Load Diversity 0.9

Growth Factor 10%

Electrical demands

Site wide loads based on the land use plan on 21/01/13 are shown below. The total non-coincident demand, including a

10% allowance for growth is estimated at 215 MVA. Applying diversity, the total load seen at the primary substations

across the development is 143 MVA. After District Cooling is taken into account for Island 4, this demand reduces to 128

MVA.

cksharma

Highlight

cksharma

Highlight

cksharma

Highlight

cksharma

Highlight

cksharma

Highlight

cksharma

Highlight

cksharma

Highlight

Buro Happold

Al Marjan Islands Development Revision 00 Stage 1 Schematic Masterplan – Engineering Report 19 February 2013 Copyright © Buro Happold 3

The potential for district cooling across the other islands is being assessed and subject to approval. The power demand

required for district cooling is still to be determined and may be taken up separately by the district cooling provider.

Figure 88 - Demands by island including 10% growth factor

* Note: The district cooling plant is estimated to require an extra 30MVA electrical load. It is considered that the proposed

Substation A will have sufficient capacity.

PARCEL LAND AREA B.U.A. F.A.R. Power Demand

Benchmark

Total Non- Coincident Demand

Diversified Load

After District Cooling

m² HA m² VA / m2 MVA MVA MVA

Hospitality

Island 1 259,314 25.9 72,000 0.28 200 14.4 9.3 9.3

Island 2 134,888 13.5 128,000 0.95 200 25.6 16.6 16.6

Island 3 207,606 20.8 150,000 0.72 200 30.0 19.4 19.4

Island 4 257,951 25.8 195,000 0.76 200 39.0 25.3 19.0

Subtotal 859,759 86.0 545,000 0.63 200 109.0 70.6 64.3

Residential

Island 1 34,627 3.5 34,500 1.00 120 4.1 2.7 2.7

Island 2 127,537 12.8 99,750 0.78 120 12.0 7.8 7.8

Island 3 72,378 7.2 20,200 0.28 120 2.4 1.6 1.6

Island 4 277,320 27.7 108,500 0.39 120 13.0 8.4 6.3

Subtotal 511,862 51.2 262,950 0.51 120 31.6 20.4 18.3

Commercial & Mixed Use

Island 1 0 0.0 0 0 140 0.0 0.0 0.0

Island 2 36,175 3.6 17,950 0.50 140 2.5 1.6 1.6

Island 3 12,256 1.2 3,000 0.24 140 0.4 0.3 0.3

Island 4 179,205 17.9 240,500 1.34 140 33.7 21.8 16.4

Subtotal 227,636 22.8 261,450 1.15 140 36.6 23.7 18.3

Amenity

Island 1 15,000 1.5 500 0.03 100 0.1 0.0 0.0

Island 2 20,000 2.0 600 0.03 100 0.1 0.0 0.0

Island 3 10,000 1.0 300 0.03 100 0.0 0.0 0.0

Island 4 19,506 2.0 6,200 0.32 100 0.6 0.4 0.4

Subtotal 64,506 6.5 7,600 0.12 100 0.8 0.5 0.5

Utility

Island 1 0 0.0 0 0 200 0.0 0.0 0.0

Island 2 17,529 1.8 0 0.00 200 3.5 2.3 2.3

Island 3 3,426 0.3 0 0.00 200 0.7 0.4 0.4

Island 4 20,822 2.1 0 0.00 200 4.2 2.7 2.7

Subtotal 41,777 4.2 0 0.00 200 8.4 5.4 5.4

Roads and Open Space

Island 1 0 0.0 0 0 15 0.0 0.0 0.0

Island 2 0 0.0 0 0 15 0.0 0.0 0.0

Island 3 0 0.0 0 0 15 0.0 0.0 0.0

Island 4 2,789 0.3 0 0.00 15 0.0 0.0 0.0

Subtotal 2,789 0.3 0 0.00 15 0.0 0.0 0.0

Marina – additional allowance made for potentially high Marina Power demands

Island 2 6.0 6.0 6.0

Island 3 3.0 3.0 3.0

Subtotal 9.0 9.0 9.0

Total Overall 1,708,329 170.8 1,077,000 0.63 195.3 129.7 115.8

Island 1 18.6 12.0 12.0

Island 2 49.6 34.3 34.3

Island 3 36.6 24.7 24.7

Island 4 90.5 58.7 44.8

Growth Fact. 10% 10% 10%

SitewideTotal 214.8 142.7 127.4

Buro Happold


4.6.3.4 Network strategy

The 132kV Over Head Line (OHL) System used in Al Marjan, shall be used to transmit electrical power to the new

132/11kV Substations designated for the new resort. The existing 132kV OHL shall provide two independent 132kV

connections for two cables to be routed underground to serve Substations A and B. Each substation is supplied with a

132kV circuit capable of supplying 100% of the total diversified load and is interlinked by 132kV HV Power cables.

Substation A and B, will be strategically located to provide efficient 11kV Medium Voltage (MV) ring distribution to supply

local step down transformers for Low Voltage (LV) distribution systems.

The circuit will consist of the following major items:

1. Two (2)132kV High Voltage transmission lines 2. Two (2) Substations, 80MVA, 132/11kV step down transformers 3. 132kV High Voltage interconnecting cables 4. Local 11/0.4kV step down transformers.

The 132kV High Voltage Network shall connect to existing 132kV HV networks for synchronous work with public grid.

Electrical Network Resilience and Discrimination

The Electrical Network will provide resilience and discrimination within the HV, MV and LV circuits. Resilience shall be

based on three scenarios typical for maintaining power within the electrical network;

Scenario 1 – Failure of supply at Power Plant 132kV Switchgear

Substations will be supplied via designated 132kV HV circuit, controlled by 132kV HV switchgear located at the power

plant. The Substations shall be interlinked via 132kV HV cables that will allow load transfer in the event of 132kV HV

circuit failure at power plant area.

Scenario 2 – Failure of supply at Substation

Substations will comprise of 3No. Transformers sized at 50% of diversified load. The transformer arrangement will allow

electrical loads to be interchanged via normally open bus couplers in the event of programmed maintenance or electrical

failure.

Scenario 3 - Failure of electrical supply at Local Substation

All Local Substations are supplied via 11kV MV ring circuits, controlled by two overload protective devices. In the event of

one circuit failing, the second circuit will provide an alternative source.

Figure 89 – New proposed power network

cksharma

Highlight

Buro Happold


Figure 90 - Proposed power network schematic

District Cooling

As only Island 4 is considered suitable for district cooling, the district cooling energy centre will be located within the

existing utility plot on Island 4, with a connection made to the TSE (irrigation) network for water supply. The district cooling

network will then distribute to the applicable developments along the highways within Island 4.

The potential for district cooling across the other islands is not thought to be suitable.

Preliminary sketches of these networks, based on the current scheme proposals are shown overleaf.

Figure 91 - Proposed district cooling network

Buro Happold


4.6.4 Suitability of existing infrastructure for new development

The confirmed as built power infrastructure runs along the highway. The highway routes are generally to be retained.

WATG have stated that existing power infrastructure may have to be removed and realigned to accommodate new road

proposals (see sketch below). Where the ring roads have been removed any utilities in those areas will need to be

grubbed up and removed.

The proposed electrical layout should aim to retain as built infrastructure wherever possible. As HV ducting is not

currently installed there is opportunity to design a HV network that is both efficient and can be constructed in accordance

with the island phasing. It is expected that although there may be an additional cost associated with realigning and

removing roads the new main bridge has the potential to add value. Where possible any relevant power infrastructure is

to be recycled for use to support new proposals.

4.6.5 Items to be replaced, diverted or redesigned

Items to be replaced, diverted or redesigned are shown in the adjacent figure.

Figure 92 - Key issues of existing infrastructure with new Masterplan

Buro Happold

Al Marjan Islands Development Revision 00 Stage 1 Schematic Masterplan – Engineering Report 19 February 2013 Copyright © Buro Happold

Appendix B – Land-use area schedule rev 00 – received 21st

January 2013

Buro Happold


Buro Happold


Appendix C - Land-use area schedule rev 01 – issued on the 4th

February

Phase 0 ScopeOctober 2013 Opening

MARBELLABAY HOTEL(302 Keys)

SANTORINIHOTEL

(269 Keys)

DOUBLETREEHOTEL

(486 Keys)

BAB AL BAHRRESIDENCES

(512 Units)

RIXOS HOTEL(454 Keys)

Al Marjan Power_Preliminary Report (2)

Documents

Transcript of Al Marjan Power_Preliminary Report (2)