design standards standard specification water network

ABN 86 069 381 960

Design Standards

Standard Specification Water Network Reservoirs

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Document Authorisation

Author: Principal Engineer Infrastructure Standards Development

Signed:

Date:

Checked by: Manager Water Asset Planning Signed:

Date:

Approved by: General Manager Asset Management Signed:

Date:

Document Revision Control

Version Description of Revision Person Making Issue Date Approval

1 Initial draft issued for review

Denis Baker 22Jan15

2

Updated to Icon Water and stakeholder workshop input. Amended to Utilities (Technical Regulation) Act

Denis Baker 12May15

© Icon Water Ltd. This publication is copyright and contains information that is the property of Icon Water Ltd. It may be reproduced for the purposes of use while engaged on Icon Water commissioned projects. Disclaimer This document has been prepared for Icon Water Ltd and is used for its purposes. No warranty is given as to its suitability for any other purpose.

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Table of Contents Abbreviations ............................................................................................................. iv 1. Purpose .............................................................................................................. 1 2. Scope ................................................................................................................. 1 3. Responsibilities ................................................................................................... 1

3.1. General Manager Asset Management ................................................................ 1 3.2. Manager Quality and Legal Compliance ............................................................. 1 3.3. Manager Process Engineering ............................................................................ 1 3.4. Manager Water Asset Planning ........................................................................... 1 3.5. Manager Water Strategic Planning...................................................................... 1 3.6. Manager Operations Services ............................................................................. 1 3.7. Manager Maintenances Services ........................................................................ 2 3.8. Project Manager................................................................................................... 2 3.9. External Designers, Contractors and Suppliers .................................................. 2

4. Reservoir Requirements ..................................................................................... 2 4.1. Design requirements ............................................................................................ 2 4.2. Standards ............................................................................................................. 3 4.3. Design life ............................................................................................................ 3 4.4. Site survey ........................................................................................................... 4 4.5. Geotechnical site investigations .......................................................................... 4 4.6. Site Lease ............................................................................................................ 5 4.7. Access Road ........................................................................................................ 5 4.8. Desilting pond ...................................................................................................... 5 4.9. Siteworks ............................................................................................................. 6 4.10. Pipework layout.................................................................................................... 6 4.11. Site Drainage ....................................................................................................... 6 4.12. Under floor drainage system ............................................................................... 7 4.13. Overflow pipework ............................................................................................... 7 4.14. Inlet pipework ....................................................................................................... 7 4.15. Outlet pipework .................................................................................................... 8 4.16. Reservoir bypass pipework ................................................................................. 8 4.17. Scour pipework .................................................................................................... 8 4.18. Washdown hydrants ............................................................................................ 9 4.19. Rechlorination ...................................................................................................... 9 4.20. Security .............................................................................................................. 10 4.21. Signage .............................................................................................................. 10 4.22. Electrical instrumentation and telemetry ........................................................... 10 4.23. Lightning protection ........................................................................................... 11 4.24. Water quality sampling point ............................................................................. 11 4.25. Roof .................................................................................................................... 11

4.25.1. Concrete Reservoir Roof 11 4.25.2. Steel Reservoir Roof 13

4.26. Fascia................................................................................................................. 13 4.27. Mechanical and safety equipment ..................................................................... 14

4.27.1. Mechanical equipment 14 4.27.2. Safety equipment and fixtures 14

4.28. Design and construction of post tensioned concrete reservoirs ....................... 15 4.28.1. Post tensioned concrete alternative 15 4.28.2. Post tensioned concrete construction methodology 15 4.28.3. Post tension concrete floor and wall footing 16 4.28.4. Post tension concrete wall 17 4.28.5. Stressing material 17 4.28.6. Stressing operations 17

4.29. Design and construction of welded steel reservoirs .......................................... 18 4.29.1. Welded steel alternative 18 4.29.2. Welded steel construction methodology 18

4.30. Valve Chambers and Drainage Pits .................................................................. 19

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4.31. Surface protection .............................................................................................. 19 4.31.1. Concrete reservoir alternative 19 4.31.2. Steel reservoir alternative 19

4.32. Stainless steel .................................................................................................... 20 4.33. Cathodic Protection ........................................................................................... 20 4.34. Drawings ............................................................................................................ 20

4.34.1. Design drawings 20 4.34.2. Shop drawings 20 4.34.1. Work as executed drawings 21

4.35. Training and Handover ...................................................................................... 21 5. Definitions ......................................................................................................... 21 6. Standard Drawings ........................................................................................... 22 7. References ....................................................................................................... 23

Icon Water Standard Specification - Reservoirs iv

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Abbreviations

BSP means British standard pipe (thread)

DICL means ductile iron cement lined

PEL means (Icon Water) preferred equipment list

PVC means polyvinyl chloride

TWL means top water level

Icon Water Infrastructure Standard Specification - Reservoirs Page 1

1. Purpose

The purpose of this standard specification is to detail the requirements for the water reservoirs for use by Icon Water in the Water Network.

The Water and Sewerage Network (Design and Maintenance) Code made under the Utilities (Technical Regulation) Act 2014 requires Icon Water Ltd to develop, maintain and implement design standards for the Water Network.

This standard specification is part of the Icon Water Design Standards and applies to all of the design, construction, commissioning and handover of water reservoirs in the Water Network.

This standard specification applies to Icon Water personnel, contract personnel engaged by Icon Water, developers including their consultants and construction contractors contracted to handover assets to Icon Water, operations contractors engaged by Icon Water and maintenance contractors engaged by Icon Water.

2. Scope

This standard specification details the minimum requirements for the design, construction, commissioning and handover of water reservoirs.

3. Responsibilities

3.1. General Manager Asset Management

The General Manager Asset Management shall be responsible for approval of this standard specification and any amendments to it.

3.2. Manager Quality and Legal Compliance

The Manager Quality and Legal Compliance shall be responsible for:

1. Ensuring that the quality framework and the legal compliance for the Design Standards documents are followed.

3.3. Manager Process Engineering

The Manager Process Engineering shall be responsible for:

1. Planning of operation of the water reservoirs. 2. Ensuring that the operational philosophy for each reservoir project gives the

required high level description of operation.

3.4. Manager Water Asset Planning

The Manager Water Asset Planning shall be responsible for:

1. Reservoirs asset condition assessments; 2. Planning of reservoirs maintenance and renewals; and 3. Asset standards for the reservoirs in the Water Network.

3.5. Manager Water Strategic Planning

The Manager Water Strategic Planning shall be responsible for Water Network master planning and reservoir capacity sizing.

3.6. Manager Operations Services

The Manager Operations Services shall be responsible for the provision of appropriately trained and experienced resources to undertake operational activities on the reservoirs within the Water Network.


3.7. Manager Maintenances Services

The Manager Maintenance Services shall be responsible for appropriately trained and experienced resources to undertake maintenance activities on the reservoirs within the Water Network.

3.8. Project Manager

The project manager (both internal to Icon Water and external) for new assets and renewal assets provision to Icon Water shall be responsible for ensuring that the design, construction, commissioning and handover of reservoirs and reservoir projects complies with this standard specification.

3.9. External Designers, Contractors and Suppliers

Designers, contractors and suppliers external to Icon Water shall be responsible for ensuring that:

1. They follow the requirements of this standard specification in the design, construction, commissioning and handover of reservoirs and reservoir projects.

4. Reservoir Requirements

4.1. Design requirements

The design of the water reservoirs is required to allow both construction methods of:

1. Welded steel; and 2. Post tensioned concrete.

Bolted steel tanks will not be accepted by Icon Water, except for where a specific acceptance of a short design life of less than 15 years is given by Icon Water.

The requirements for water reservoir design include the following provisions:

1. Addressing the requirements of the Design Criteria (Reference 4) and project specific design requirements;

2. Submission of design drawings and design report; 3. Minimum design life of the reservoir and other associated components in

accordance with clause 4.3; 4. Effective water storage volume as nominated by Icon Water shall be between

TWL and outlet level 300 mm above floor level; 5. Overflow pipework with overflow level 80 mm above the TWL; 6. Location of the reservoir site to minimize impacts of flooding (overflow or failure)

and noise; 7. Location on sound and consistent geological formation (geotechnical

investigation); 8. Site survey; 9. Radio signal strength survey for telemetry; 10. Site drainage pits and pipework; 11. Access road; 12. Reservoir roof which shall include pest control; 13. Inlet and separate outlet; 14. Adequate clearance around the reservoir for vehicular access for construction

and maintenance; 15. Low level access hatches in the wall of the reservoir; 16. Large roof access hatch for inspections and maintenance; 17. Free standing, enclosed, external stairways; 18. Roof perimeter guardrail; 19. Personnel fall prevention and rescue equipment and fixtures;


20. External fixtures for washing down during reservoir cleaning; 21. Bypass pipework for when the reservoir is out of service and for emergency

bypass of the reservoir; 22. Overflow pipework; 23. Reservoir inlet rechlorination dosing point; 24. Cast in situ reinforced concrete valve chambers and pipework; 25. Anti graffiti surface coating to the reservoir walls; 26. Lightning protection; 27. Desilting pond within the site of the reservoir; 28. Materials compliance with AS/NZS 4020; 29. Water quality sampling point on the reservoir outlet piping; 30. Electrical power supply, switchboard, instrumentation and telemetry; 31. Operations and Maintenance manuals; 32. Obtaining a land lease for Icon Water for the reservoir site; and 33. Security fencing on the perimeter of the site boundary.

4.2. Standards

Australian and international standards that are applicable to the Icon Water Design Standards

are listed in the Icon Water Design Criteria in Appendix B.

Additional standards that apply to water reservoirs include:

1. ANSI/AWWA D100 - 2011 - Welded Steel Tanks for Water Storage 2. AS 1237 Plain washers for metric bolts, screws and nut for general

purposes 3. AS 2419.2 Fire hydrant installations - Fire hydrant valves 4. AS 2890.2 Parking facilities - Off street commercial vehicles facilities 5. AS 3566 Self drilling screws for the building and construction

industries 6. AS 3990 Mechanical equipment - Steelwork 7. AS/NZS 1158.3.1 Lighting for roads and public spaces - Pedestrian area

(Category P) lighting - Performance and design requirements

8. AS/NZS 1314 Prestressing anchorages 9. AS/NZS 1768 Lightning protection 10. AS/NZS 4380 Safety mesh 11. AS/NZS 4672.1 Steel prestressing materials - General requirements 12. AS/NZS 4672.2 Steel prestressing materials - Testing requirements

Icon Water Planning Guidelines for the Water Network, the Design Criteria for the Water

Network including its list of Standard Specifications, the Preferred Equipment Lists, the

Standard Specifications which are listed in the Icon Water Design Criteria in section 6 and the

Standard Drawings for the Water Network are also applicable to water reservoirs.

4.3. Design life

The minimum design life requirements include:

1. Reservoir including roof 80 years 2. Pipework 50 years 3. Access road 25 years 4. Mechanical equipment 25 years 5. Electrical equipment 25 years 6. Electronic equipment 15 years 7. Surface protection on steelwork 15 years.


For those components that this standard specification or a project specific requirements allows consideration of alternative construction methods or materials, selection of the preferred option shall include determination of the most cost effective option by a net present value analysis for the whole of the required design life of the reservoir.

4.4. Site survey

The reservoir site shall be surveyed by a registered surveyor to identify:

1. Surface contours; 2. Site boundaries; 3. Adjoining property improvements if within a radius of 500 metres of the

centre of the reservoir site; 4. Location of any identified heritage or environmentally significant items either

on the reservoir site or within the 500 metres radius; 5. Site features including rock outcrops, drainage lines and trees; 6. Location of geotechnical boreholes and test pits; and 7. Any existing services which shall be identified and located by potholing at

required key locations.

The site survey shall be submitted in electronic format in compliance with the Icon Water Drafting Standard.

During construction, work as executed location of the site security fence, buried pipework, valve chambers and reservoir internals shall be surveyed and recorded on the project drawings.

Before testing and commissioning, accurate survey shall be undertaken and compared to the issued for construction drawings. Any differences shall be recorded on the works as executed drawings.

4.5. Geotechnical site investigations

Reservoir site selection is required to recognise the requirement for sound and consistent geological formation and substrata to ensure achievement of the minimum design life of the reservoir. Sufficient boreholes and test pits shall be made to establish a thorough understanding of the site and subsurface conditions.

The geotechnical site investigations results will be used for identifying subsidence areas, identifying settlement issues, design of the reservoir foundations, pipework thrust restraint, construction of the desilting pond, access road and vehicle parking and turning areas.

The geotechnical site investigations shall comply with the minimum requirements of AS 1726 including:

1. Methods of investigation; 2. Reporting; 3. Construction review; and 4. Performance monitoring.

The geotechnical site investigations report shall include both factual presentation of findings and interpretative results covering:

1. Possible differential settlement performance; 2. Water table location across the site;


3. Performance of foundation soils on exposure to water including the need for design and construction of under floor drainage system where soils could be affected by leakage from the reservoir;

4. Vertical bearing capacity and variability across the site; 5. Horizontal bearing capacity for thrust block design; 6. Base or bedding type and compaction; 7. Subbase preparation; 8. Recommended batter slopes for long term stability of embankments and

batters; and 9. Construction constraints.

4.6. Site Lease

If Icon Water does not already have a lease for the reservoir site, then the designer and surveyor scope of work shall include support to Icon Water for land valuation and acquisition. If necessary for an existing site already leased by Icon Water, this support shall include the extension of the area of the existing lease.

4.7. Access Road

An all weather access road shall be provided from a close public road to the reservoir site. The access road shall include vehicle access all around the reservoir and a vehicle parking area near the reservoir for two small rigid vehicles of the type described in AS 2890.2.

If necessary a temporary access road shall be provided for construction. The temporary or permanent access road shall be maintained open and accessible during construction for Icon Water personnel and vehicles.

The permanent access road shall be included in the site lease or a suitable easement created for it.

Minimum access road requirements include:

1. Pavement width of 3 metres; 2. Minimum grade shall be 0.5%; 3. Maximum grades – surface finish:

a. concrete pavement 15%; b. flexible pavement with asphalt seal 12%; and c. unsealed pavement 5%.

4. Crossfall 3%; and 5. Road signage including speed limited to 20 km/h.

Design of road drainage shall recognise the catchment above the road and shall as a minimum be a grassed swale of 1200 by 300 deep with drainage pipes of DN375 minimum.

Refer to clause 4.9 for access road abutting the edge of the reservoir.

4.8. Desilting pond

Unless EPA requirements are accepted as being met by other control measures, a desilting pond shall be provided below the reservoir floor level. The capacity of the pond shall be equal to the volume of water 500 mm deep across the floor of the reservoir. The embankment of the desilting pond shall be less than 5 m high.

Reservoir overflow, on site scours on pipelines and the reservoir scours shall discharge to the desilting pond via pipework and a dechlorination pit.


Dechlorination by manual dosing of the scour flows before discharge to the desilting pond shall be facilitated by the arrangement of the pipework and pits.

Access to the bottom of the pond for a skid steer loader for removal of dewatered silt shall be provided.

The desilting pond shall have a low flow outlet pipe and overflow weir. The low flow outlet pipe shall be 150 mm with Schedule 10S vertical perforated pipe wrapped with geotextile and similar to drawing SDW-C020. The overflow weir shall be designed to spread the discharge flow and located for discharge flow to enter a natural drainage line. The design capacity of the pond overflow weir shall be greater than the reservoir overflow design capacity, refer to section 4.13.

The desilting pond is required to be located within the lease area and inside the reservoir security fence.

4.9. Siteworks

Design of the siteworks shall take into account:

1. Existing stormwater runoff and drainage lines and reservoir roof and site drainage (refer to clause 4.10);

2. Overflow and leakage and scour drainage (refer to clauses 4.12 and 4.17); 3. Extent and impact of excavation and backfill on any adjacent structures; 4. Clearances to overhead and underground services and assets; and 5. Access for operations and maintenance including access road specified in

clause 4.7.

Design and construction of access and siteworks shall include the following minimum requirements:

1. Stable embankment slopes at grades selected to suit the material; 2. A bench below the reservoir floor which is uniform as cut and fill will not be

acceptable; 3. Soft areas shall be excavated and replaced with concrete; 4. 1500 mm wide concrete path all round and abutting the reservoir with 2%

to 3% cross fall away from the reservoir wall; 5. 4500 mm wide sealed access road abutting the outside edge of the

concrete path suitable for elevating work platform (refer to clause 4.7); 6. 600 mm wide open concrete invert drain abutting the outside edge of the

reservoir access and the toe of the excavation batter; 7. 300 mm wide toe at bottom of excavated batter, to include a kerb to

minimize the deposition of batter silt from entering the spoon drain; and 8. Landscaping treatment being low maintenance without trees or shrubs to

limit fire and security risks.

4.10. Pipework layout

Pipework layout shall avoid piping under the reservoir footprint other than that which is shown on the standard drawings or specifically required by this Design Standard. Where required by the standard drawings or this Design Standard pipework under the reservoir footprint shall be concrete encased and have flanged joints.

4.11. Site Drainage

The stormwater drainage of the reservoir site shall be designed to discharge to the low side of the site. Discharge shall be piped to where the natural slope changes from steep to gradual and from there shall become surface flow following natural drainage lines.


Storm flow cut off drains shall be provided on the high side of the reservoir site to divert stormwater runoff away from the base of the reservoir.

Site grading around the edge of the reservoir shall be designed to carry over land storm flow as well as reservoir roof storm flow. This stormwater flow shall be directed to drainage pits and pipework. Minimum size of stormwater pipework shall be DN375. Stormwater pits shall be provided at changes of direction of pipework. Stormwater pits shall be cast in situ reinforced concrete and shall be structurally designed and comply with the requirements of clauses 4.28.2 and 4.30. Vertical access ladders complying with the Standard Drawings and AS 1657 shall be provided in the stormwater pits that are more than 600 mm deep.

4.12. Under floor drainage system

Where the geotechnical investigations report identifies the need for under floor drainage, design of the under floor drainage system shall include drain layout partitioned to assist location of reservoir leakage. Partitioned under floor drains shall separately discharge to the dechlorination pit. Work as executed drawings shall record the location of partitions in the under floor drainage and identify the partition location and the underfloor drainage pipe connected to the respective partition.

4.13. Overflow pipework

The reservoir overflow pipe shall be a vertical pipe inside the reservoir. The overflow pipe shall be at least one standard size larger than the size of the inflow pipework. The reservoir overflow rate shall be equal to the maximum possible inlet flow rate (not the design maximum inflow) for the reservoir and shall be used to design the overflow pipework size and design the overflow weir (bellmouth). The crest of the overflow weir shall be 80 mm above the reservoir TWL and 220 mm below the underside of the reservoir roof structure. The maximum water depth over the weir shall not exceed 120 mm.

The reservoir overflow pipe shall not have any valves and shall discharge to the dechlorination pit.

The overflow pipe shall have a flanged connection 300 mm above the reservoir floor.

The overflow pipework shall be DICL in a post tensioned concrete reservoir and steel in a welded steel reservoir with surface protection complying with Icon Water Standard Specification - Surface Protection. An alternative material for both types of reservoir is 316 stainless steel with 316 stainless steel bellmouth having taper no greater than 4:1 and without surface protection except system S21 of Standard Specification – Surface Protection. Stainless steel overflow shall be fitted

4.14. Inlet pipework

The reservoir inlet pipe shall include a vertical standpipe pipe inside the reservoir located with its centreline within 1 metre of the reservoir wall.

The inlet pipe shall be designed for maximum inflow rate for the reservoir.

The inlet pipework in the reservoir shall nominally be DICL in a post tensioned concrete reservoir and steel in a welded steel reservoir with surface protection complying with clause 4.31 and Icon Water Network Standard Specification - Surface Protection. An alternative material for both types of reservoir is 316 stainless steel without surface protection.

The inlet standpipe shall terminate with a flanged connection at 0.7 m above the reservoir floor.


Bolted to the inlet stand pipe shall be a tank mixing eductor. The diameter of the nozzle shall achieve a velocity of 5 m/s at maximum inlet flow rate. The nozzle is to direct the water in an upward direction, 45° from the horizontal and at an angle of 45° from the centre of the reservoir. This is to aid general mixing of the water in the reservoir.

The inlet standpipe centreline shall be separated by an arc of 180o from the two outlet.

The inlet pipework shall not be used to vent the reservoir bypass pipework.

4.15. Outlet pipework

If the outlet pipe sizes are not nominated by Icon Water for the reservoir, then the designer shall determine the pipe sizes to ensure that, while drawing the specified fire fighting flow at points within 150 metres of the fire ground (concurrently with peak hour demands), residual pressures in the reticulation mains do not fall below the equivalent of 10 metres head. This residual is to be achieved with the reservoir at half capacity and an allowance for reservoir outlet losses of 1.5 metres.

The reservoir outlet shall be located with its centreline within 2 metres of the reservoir wall and separated by an arc of 180o from the inlet. The outlet shall be at a level of 150 mm above the reservoir floor. The lip on the outlet shall be within 2 mm of level all round and shall be 1.6 times the nominal outlet pipe diameter. The lip level shall be used as the zero point for water level monitoring. The outlet shall be covered with mesh for personnel protection. Mesh shall be 100x100x3 bars and shall be 316 stainless steel in post tensioned concrete reservoirs and carbon steel with surface protection in steel reservoirs.

The outlet pipework in the reservoir shall nominally be DICL in a post tensioned concrete reservoir and steel in a welded steel reservoir with surface protection complying with clause 4.31 and Icon Water Standard Specification - Surface Protection system S5.

4.16. Reservoir bypass pipework

Pipework shall include a bypass between inlet and outlet for when the reservoir is out of service. The bypass pipe size shall be no less than one standard size smaller than the outlet pipe size. The bypass isolation valves shall be flanged gate valves, hand wheel operated which shall be provided with heavy chain for padlocking in closed position.

A pressure reducing valve shall be provided to control the pressure in the outlet main to mimic the reservoir. Where the TWL of the reservoir is below 675 m AHD, a pressure relief pipe is to be provided via an open ended pipe, with no valves to be installed on the pressure relief pipe.

4.17. Scour pipework

The reservoir scours shall be nominally three in number for reservoirs of more than 20 metres diameter and two in number otherwise. Scours shall commence at the reservoir floor with a 1000x1000 mm square by 150 deep drop box with pipework commencing at the invert of the drop box. Pipe shall be DICL for post tensioned concrete reservoirs and steel for welded steel reservoirs changing to DICL within the concrete encasement of the pipework below the reservoir floor. Pipe elbow shall be flanged DI with thermal bonded polymeric coating complying with Icon Water Standard Specification - Surface Protection system S17.

The floor of the reservoir shall be graded throughout to fall to top of respective scour drop boxes. The nominal fall shall be a minimum of 0.5%. The centre of the drop boxes shall be located approximately within 1 metre of the reservoir wall,


equispaced around the wall of the reservoir and at least 2 metres from any outlet. The minimum number of scour outlets is four.

The scour pipework shall discharge to the dechlorination pit required by clause 4.8.

One scour outlet shall be fitted with a flanged tee for connection of the reservoir level sensing line. This tee shall be 300 mm beyond the scour pipework concrete encasement and the scour valve connected to this tee. All scour valves shall have a dismantling joint installed on the down stream side. The tee, sensing line connection, scour valve and dismantling joint shall be in a reinforced concrete valve chamber.

On the top of the pit wall that houses the water level instrument, provide a surveyed Bench Mark (elevation accuracy important) this is one of three to be provided in the reservoir site.

Scour lines shall discharge to a chamber as soon as practical, to enable easy detection of a leaking scour valve during maintenance and inspection activities. Multiple scour lines joining prior to entry to a chamber is not permitted.

4.18. Washdown hydrants

Two reservoir washdown hydrants shall be provided for manual washdown and cleaning of the reservoir. They shall be located external to the reservoir adjacent to each wall mounted access holes. . The hydrant valves shall comply with AS 2419.2 be DN65 size with flanged inlet connection and be right angle type. The hydrant valve outlets shall be fitted with a 40 mm stainless steel Storz coupling in accordance with AS 2419.2. The hand wheel of the hydrant valves shall be 1200 mm above the surrounding finished level. The pipework supplying the hydrants shall be buried DN100 DICL and laid outside of the reservoir ring beam where possible. The pipe elbow below each hydrant shall be flanged DI with thermal bonded polymeric coating complying with clause 4.31 and Icon Water Standard Specification - Surface Protection system S17. Above the flanged elbow the pipework shall be DICL with surface protection complying with clause 4.31 and Icon Water Standard Specification - Surface Protection system S5 or S13 or S17. The pipework shall be designed so that it is connected to the water supply when the reservoir is isolated with a gate valve at the connection to the water main.

One of the hydrants shall have a booster connection with 40 mm stainless steel Storz couplings. A flanged non return valve shall be installed in the pipeline between this hydrant and the booster connection.

4.19. Rechlorination

The inlet pipework to the reservoir shall be fitted with a chlorine solution injection point mounted on a tee in the inlet valve chamber complying with Standard Drawing SDW-M020. The injection point shall include a DN20 injection quill containing:

1. DN20 BSP male connection to the water main; 2. DN25 PVC ball valve; 3. DN25 gland; 4. DN12 PVC pipe injection quill attached to DN20 PVC ball valve; 5. DN20 hose tail; 6. DN20 pressure hose; and 7. DN20 PVC male Camlock coupling, PVC ball valve and fixed support at the

end of the flexible pipe just below the valve chamber cover.


4.20. Security

Security fencing shall be provided on the perimeter of the reservoir site boundary. The security fence shall be chain link security fencing in accordance with standard drawings SDW-C005, SDW-C006, and SDW-C007, unless the project requirements specify welded mesh security fencing in accordance with standard drawings SDW-C008, SDW-C009, SDW-C010 and SDW-C011.

The security fence shall include intruder detection in accordance with clause 4.22 and the Icon Water Standard Specification – Security (when available).

4.21. Signage

Signage shall be provided at the reservoir site which includes signs complying with Standard Drawings SDW-C002, SDW-C003 and SDW-C004 and shall include:

1. Sign Type 1 only for the duration of construction; 2. Sign Type 4; 3. Sign Type 7; 4. Sign Type 8; 5. Sign Type 9; and 6. Sign Type 18.

4.22. Electrical instrumentation and telemetry

The electrical and instrumentation design and installation at reservoirs shall comply with:

1. Icon Water Standard Specification – Electrical (when available); 2. Icon Water Preferred Equipment List; and 3. Standard Drawings listed in Icon Water Design Criteria in Appendix A.

The telemetry design and installation at the reservoir shall comply with:

1. Icon Water Standard Specification - Telemetry; 2. Icon Water Preferred Equipment Lists; and 3. Standard Drawings listed in Icon Water Design Criteria in Appendix A.

Unless stated otherwise in project specific requirements for small reservoirs with no three phase actuated valves, electrical power supply to reservoir sites shall be 415 V 50 Hz 3 phase. Buried electrical power supply cables shall be installed in underground conduits within the reservoir site lease.

Telemetry provided for both the Operations Telemetry Network and the Security Telemetry Network shall be by optical fibre and microwave link to provide sufficient bandwidth for the Security Telemetry Network.

Direct current battery backup system or uninterruptible power supply system shall be provided for the reservoir site, determined by specific project requirements, to supply extra low voltage for controls and monitoring during power loss conditions. This system will power monitoring, control and telemetry. Specific project requirements may include supply on power failure to motorised valve actuators and/or solenoid valves.

Human machine interface shall be provided at the reservoir site for maintenance, monitoring, troubleshooting and operation of:

1. Local motorised valves; 2. Local instruments; 3. Other instruments that have relevance to that specific site from other

system sites (including upstream pressure); and


4. Acknowledgement of local alarms.

Instrumentation for reservoir sites shall include:

1. Flow meter for site inflow; 2. Flow meters for site outflow to each water supply zone; 3. Pressure instruments to measure reservoir fill level (for reservoir level

sensing line installation refer to clause 4.17); 4. Pressure instrument to measure each water supply zone pressure at the

supply point; 5. Valve chamber flood float switches in all chambers that contain electrical

equipment. 6. Intruder detection sensing fitted to switchboards; 7. Intruder detection sensing fitted to reservoir gates, security fence and

doors; 8. Security closed circuit television cameras and cabling covering the site; 9. Site power failure detection; 10. Surge diverter fault detection; and 11. Valve motorised actuators alarming.

Valve motorised actuators at reservoir sites shall comply with the Icon Water Preferred Equipment List including communications capability as well as backed up with hardwired connections.

4.23. Lightning protection

Lightning protection shall utilise earth stakes as per AS/NZS 1768 and surge diverters to control energy and protect equipment. More than one earth stake may be necessary to comply with AS/NZS 1768. Precise location of earth stakes and earth mat shall be surveyed during construction and recorded on work as executed drawings for the reservoir site. Lightning protection shall be designed to allow compliance with inspection and testing requirements of AS/NZS 1768 while protecting the lightning protection system components from vandalism, interference and theft. Details of the lightning protection system installation design shall be submitted to Icon Water for acceptance with the design of the welded steel or post tensioned concrete design of the reservoir.

4.24. Water quality sampling point

A water quality sampling point shall be provided on the outlet piping from the reservoir.

The location of the sampling point discharge shall be 500 mm below the reservoir floor.

The sample point shall comply with Standard Drawing SDW-H012 if located within the security fence.

If this is located outside the security fence, then the sample point shall comply with Standard Drawing SDW-H011.

4.25. Roof

Water reservoirs shall have a roof.

4.25.1. Concrete Reservoir Roof

For concrete reservoirs the roof shall be light weight roof supported by columns in the reservoir and the walls of the reservoir. The structural elements of the roof of reservoirs shall include:

1. Rafters on the radius of the reservoir;


2. Intermediate rafters bolted to radial rafters; 3. Purlins bolted onto the rafters; 4. Bolted cross bracing between purlins; 5. Fly bracing over the purlins if required by the structural design; 6. Fascia structural support; and 7. Welded frame for each skylight, ventilation opening and access platform

and hatch.

The structural elements of the roof shall be designed for:

1. Permanent, imposed and other actions in accordance with AS 1170.1; 2. Wind actions in accordance with AS 1170.2; 3. Earthquake actions in accordance with AS 1170.3; 4. Support of the load imposed by a centrally located safety harness anchor

point required by clause 4.27.2; 5. Roof sheeting slope falling to the outer edge at a minimum of 2% slope;

and 6. Welding of structural elements complying with ASNZS 1554.6 with weld

category 1B at least and surface finish II at least.

Roof cladding shall be Colorbond coated (refer to clause 4.31 for finish colour). Structural steel frame shall be supported by structural steel columns. Columns, frame, purlins, rafters and cladding shall be grade 316 stainless steel with grade 316 (A4) stainless steel fixings. Aluminium roof components including below the cladding will not be accepted due to accelerated corrosion of aluminium caused by lime that may be dosed into the water. Structural steel columns, frame and purlins shall be passivated and unpainted. All roof cladding shall be laid in single, continuous lengths. Cladding which is cut or trimmed to shape shall be left with a clean cut edge without jags and with no distortion of the profile or cross section. The valleys in the cladding sheets shall be turned up at the high end. The low end of the cladding sheets shall project evenly beyond the fascia of the reservoir by a minimum of 50 mm.

Roof cladding sheets shall be crest fixed to purlins only NOT valley fixed. Fasteners shall comply with AS 3566.2 Corrosion Resistance Class 4. This standard is based on corrosion exposure of the head. Due to high condensation exposure of the fastener shanks, grade 316 (A4) stainless steel fasteners with hexagon heads and integral washer head shall be provided. Fasteners shall be complete with resilient washers which shall be free of carbon fillers. Fasteners shall be installed so that washers are compressed without over tightening or any distortion of the roof cladding sheets.

Bolted connections between structural columns, frame, rafters and purlins shall use a minimum of two and minimum size of M16, high strength bolts and nuts per connection. Washers shall be provided under bolt heads and nuts. Bolts, nuts and washers shall be grade 316 (A4) stainless steel. Threads shall be coated with nickel based antiseize compound before assembly. Dimensions of plain washers shall match the dimensions in AS 1237.1 and AS 1237.2 Grade A.

Connections between structural steel and concrete shall use a minimum of two and minimum size of M16 chemical anchor bolts per connection. Washers shall be provided under anchor bolt nuts. Anchor bolts, nuts and washers shall be grade 316 (A4) stainless steel. Threads shall be coated with nickel based antiseize compound before assembly. Dimensions of plain washers shall match the dimensions in AS 1237.1 and AS 1237.2 Grade A.


Connections between the roof structural steel and the walls and floor of steel for steel reservoirs shall include insulation between dissimilar metals.

Skylights shall be provided in the roof near the edge of the central roof vent. Three equispaced skylights shall be provided. The skylight, frame and attachments shall comply with Standard Drawing SDW-C022. The skylight material shall be polycarbonate sheet cladding with the profile matching the profile of the roof cladding sheets. The skylight sheets shall overlap the end of the roof cladding sheets by a minimum of 300 mm and the end laps shall be sealed. Skylight sheets shall extend from near the central roof vent for 2 m before the edge of the overlap. All sheets, when fastened, shall have full bearing on the purlins and their ends shall extend not less than 50 mm beyond the edge of the purlin. Skylight roof sheeting shall be tinted white. Grade 316 stainless steel safety mesh otherwise complying with AS/NZS 4389 shall be provided beneath each skylight suitably fixed to the purlins. The wire diameter in the safety mesh shall be 3.15 mm. The safety mesh shall be attached by passing each wire once completely around the purlins and tying the tail of each wire by twisting it four times around the main portion of the same wire similar to AS/NZS 4389 Figure 2(b). Any joint in the safety mesh shall comply with AS/NZS 4389.

Roof platform and roof access hatch shall be located adjacent to the free standing stairway structure. The platform around the roof access hatch shall be supported by the roof structure have guardrails around the external edge and the internal edge to protect personnel once the roof access hatch is open. The guardrails shall include self closing gates to the access hatch at both ends and to the perimeter guardrails on each side to the roof platform. The guardrails shall be continuous with the perimeter guardrails on the roof. The roof platform and guardrails shall comply with the Standard Drawings listed in clause 6.

The roof access hatch shall have clear opening of 3100 mm by 1800 mm. The hatch cover shall be installed on roller bearing wheels for sliding open and closed. The hatch cover shall be padlockable in both the open position and closed position.

4.25.2. Steel Reservoir Roof

For steel reservoirs the roof shall be either:

1. Light weight roof supported by columns in the reservoir and the walls of the reservoir and in compliance with the requirements of clause 4.25.1 with fascia in compliance with clause 4.26; or

2. Roof plates designed and constructed in accordance with American Water Works Association Standard ANSI/AWWA D100-11 with skylights, central roof vent, platform, roof hatch and roof perimeter guardrail as required by clause 4.25.1. All weld joints including both faces shall be fully seal welded. Safety mesh under skylights shall be fixed by attaching each wire of the mesh to eye bolts welded to the roof and twisting each wire around itself four times. Eye bolts shall be a minimum of 12 mm thick. Connections between reservoir components shall include insulation between dissimilar metals. There shall be 40 mm gap between toeboards on the perimeter guardrail and the top of the roof plates. Roof plates shall project evenly beyond the steel wall by at least 50 mm.

4.26. Fascia

Concrete reservoirs and steel reservoirs with light weight roof shall have a sheet metal fascia at the other edge. The component materials shall match the roof component materials specified in clause 4.24.

The elements of the fascia shall include:


1. Welded structural framework attached to the reservoir wall and roof structural steelwork;

2. Vertical sheet metal cladding matching the roof cladding; and 3. Pest control and ventilation mesh required by clause 4.27.1.

4.27. Mechanical and safety equipment

4.27.1. Mechanical equipment

Passive roof ventilation shall be provided in the roof including:

1. At the centre of the roof; and 2. At the roof periphery in the soffit of the fascia between the reservoir wall

and the bottom of the fascia.

Unless project specific requirements are otherwise, the central roof vent shall consist of a raised section of the roof approximately 300 mm high and 1 to 2 m in diameter. Flashing matching the roof sheeting colour shall be provided between roof sheeting and the central roof vent.

Passive roof ventilation shall include pest control using grade 316 stainless steel welded mesh of 10x10x1.6 mm set in 25 mm wide fold formed frame made from 1 mm thick grade 316 stainless steel. Each length of the sections of soffit pest control mesh shall not exceed 2 metres. Pest control mesh shall be fixed with minimum M12, 316 stainless steel screws, large washers and nyloc nuts. Pest control mesh shall be located to prohibit roosting by birds on any part of the roof structure including the stairway on the outside of the reservoir.

Steel flanged access holes shall be provided in the wall of the reservoir with its centre nominally located 600 above the bottom of the wall of the reservoir. Two diametrically opposed access holes shall be provided. Clear opening of the access holes shall be at least DN750 size for post tensioned concrete reservoirs and DN900 size for welded steel reservoirs. The flange dimensions of the access holes shall match AS/NZS 4087 Figure B7. The blank flange of each access hole shall have a permanently installed davit arm attached. For concrete reservoirs the bolts, nuts and washers shall be grade 316 (A4) stainless steel for the flange and chemical anchors. For concrete reservoirs the blank flange, davit arm assembly and the access hole assembly shall be grade 316 stainless steel. For steel reservoirs bolts, nuts and washers shall be grade 316 (A4) stainless steel with dissimilar metals insulation and the blank flange, davit arm assembly and the access hole assembly shall be steel and surface protected as specified for the reservoir wall.

All anchor bolts, washers and nuts installed inside of the post tensioned concrete reservoirs shall be grade 316 (A4) epoxy anchors. Threads shall be coated with nickel base anti seize before assembly. Dimensions of plain washers shall match the dimensions in AS 1237.1 and AS 1237.2 Grade A.

4.27.2. Safety equipment and fixtures

Roof perimeter guardrails complying with AS 1657 shall be provided all around and at the perimeter of the reservoir roof. Toeboards shall be provided and to reduce the accumulation of leaf litter on the roof shall be positioned so that the bottom of the toeboards is 40 mm above the top of the crests of the roof sheeting or roof plates. All other toeboards shall be positioned so that the maximum gap at the bottom is 10 mm. Guardrail shall be fixed to and supported by the roof structure and not by the roof cladding where light weight roof is installed. Additional struts, brackets and purlins shall be designed into the roof structure to support the guardrail. Proprietary free standing guardrail system shall not be used for the permanent guardrail.


Fall prevention davit attachment points complying with the Icon Water PEL shall be provided adjacent to the roof access hatch and concrete encased type in the wall of valve chambers and drainage pits that are fitted with access ladders.

A free standing stairway structure extending to the roof shall be provided on the outside of the reservoir. The structure shall be constructed using hot dip galvanised structural steel sections, with hot dip galvanised fasteners of M16 minimum size and 316 stainless steel anchor bolts, nuts and washers. This structure shall contain the electrical switchboard at ground level, if specific project requirements do not locate it elsewhere. The stairway structure shall be clad for the full height in Colorbond zincalum sheeting. Sheeting of colour shall comply with the requirements of clause 4.31.1 or 4.31.2. SL81 hot dip galvanised mesh shall be fixed internally on the inside of the girts of the structure between the bottom girt and the girt below the first landing in the stairway. The designer shall ensure that the stairs are in the preferred zone in AS 1657 Figure 2.1 i.e. 30 to 38 degrees. Two doors shall be provided to the stairs at ground level as shown on standard drawing SDW-S023 and SDW-S024. Each door shall be Sealek Ultraguard extra heavy duty security doors supplied with:

1. Opening size 1200 mm wide by 2400 mm high; 2. Internally fully welded square hollow section steel subframe; 3. Solid, high moisture resistant core; 4. 1.6 mm galvanised skins; 5. Icon Water keying; and 6. One continuous stainless steel piano hinge.

A vertical ladder complying with AS 1657 shall be installed internally under the roof access hatch. This ladder shall have an intermediate landing attached to the wall of the reservoir and off set to the side of the ladder. The ladder and landing shall be all grade 316 stainless steel. All fasteners including anchor bolts in post tensioned concrete reservoirs shall also be grade 316 (A4) stainless steel. Attachment brackets in the welded steel reservoirs shall be steel welded to the reservoir wall and floor with dissimilar metals insulation. Refer to standard drawing SDW-S022.

4.28. Design and construction of post tensioned concrete reservoirs

4.28.1. Post tensioned concrete alternative

Other clauses of this standard specification contain specific requirements or options for post tensioned concrete reservoirs. The requirements in this clause 4.28 are in addition to the other clauses that are specific to the post tensioned concrete reservoir alternative.

Materials included in the design and construction of post tensioned concrete alternative shall all comply with AS/NZS 4020. This applies to any material embedded in the concrete as well as in direct contact with potable water including concrete admixtures, plastic grouting tubes, sealants, seals and coatings.

4.28.2. Post tensioned concrete construction methodology

The constructor shall be required to provide a construction methodology, from his specialised post tensioned concrete designer, for the acceptance by Icon Water. When requested by Icon Water the constructor shall conduct a workshop including the designer and Icon Water personnel to confirm the construction methodology.

The workshop will be used to confirm the details, methods and inspection points of the following:

1. Concrete casting sequence; 2. Concrete curing procedure;


3. Installation and stressing of post tensioning; 4. Grouting of sheathing and anchorage zones; 5. Method of manufacturing and quality control of precast components; 6. Installation of roof support structure; 7. Installation of roof; 8. Installation of fixtures and fittings; and 9. Installation of pipe penetrations.

The accepted methods shall be documented in work method statements prepared by the specialist designer and constructor. The method statements shall cover all aspects of the construction, including agreed inspection points and checklists and forms. The method statements shall also cover the application of any additional protection and the relevant safe work practices. The method statements shall be finalised prior to the commencement of the concrete work.

At least the following inspection points shall be observed and minimum of 48 hours notice shall be given for each:

1. HOLD POINTS: a. Submission for acceptance by Icon Water of the method

statements; b. Submission for acceptance by Icon Water of reservoir floor and wall

design drawings and calculations; c. Submission for acceptance by Icon Water of shop drawings of roof

support structure including identification marks specified below; d. Preparation of vertical stitch joints for placement of the concrete; e. Preparation of horizontal joints at the wall and floor for placement of

concrete; f. Submission for acceptance by Icon Water to commence grouting of

stressing tendons; and g. Surface preparation prior to protective coating.

2. WITNESS POINTS: a. Completion of formwork and reinforcement placement for precast

panels prior to commencement of concrete placement; b. Completion of formwork and reinforcement placement for the floor

prior to commencement of concrete placement; c. Commencement of fabrication; and d. Completion of erection prior to surface preparation for protective

coating.

Suitable and sufficient component identification marks or other means for identifying each member shall be provided on drawings and for the correct setting out, location, erection and connection of the steelwork. Bolted connections shall be marked to show the bolting category.

4.28.3. Post tension concrete floor and wall footing

The floor and wall footing shall be designed and constructed as a continuous unjointed post tensioned concrete slab thickened below the wall, below column supports, at scour drop boxes and at pipe penetrations.

The floor shall be laid on two layers of 300 micron polyethylene building film to allow movement during tensioning. The building film shall be laid on a bedding layer appropriate to the reservoir floor and, if installed, appropriate to the under floor drainage system (refer to clause 4.12). This bedding layer shall also comply with the post tensioning design subgrade friction requirements.

The floor shall be finished by steel trowelling to a smooth surface. Surface finish shall comply with class 2 of AS 3610.1.


The concrete floor and wall footing shall have 20 mm by 45o chamfer on all exposed, external corners.

Any temporary anchor bolts installed in the floor shall be chemical anchors using 316 stainless steel, for example, for temporary props used during construction which shall be cut off when no longer required and then heavily coated with epoxy.

The external surface of the wall footing shall be no more than 300 mm above the finished ground level so that guardrailing required by AS 1657 is avoided.

4.28.4. Post tension concrete wall

The reservoir wall shall be designed and constructed from post tensioned concrete.

All surfaces shall be surface finish class 2 of AS 3610.1.

Reservoir wall vertical stitch joints for precast concrete wall panels shall have a ‘keyed’ profile and include overlapping reinforcement of adjacent panels on both faces. A hydrophilic water seal such as ‘Hydrotite’ shall be applied to each vertical face. Post tensioning ducts at the joints shall be well aligned, sealed and checked to be clear of debris prior to pouring of the wall stitch joints. The ducts shall be checked to be clear of any ingress of cement or mortar immediately after the joint is poured. This shall include water flushing till clear and then dry the ducts with dry compressed air.

4.28.5. Stressing material

Stressing material for post tensioned concrete shall be high strength steel 7 wire strand stress relieved tendons complying with AS/NZS 4672.1.

Tendon anchorages shall be in accordance with AS/NZS 1314. Stressing tendon ducts shall be zinc coated steel, so constructed that ingress of cement or mortar during concreting is prevented. The duct shall have a maximum friction curvature coefficient M of 0.25.

4.28.6. Stressing operations

All stressing operations shall be performed in strict accordance with the relevant manufacturer’s specifications and under the specialist designer’s full time, on site supervision.

The prestressing force shall be checked by reading the jacking pressures and the elongation of the strands. All gauges shall be calibrated before dispatch to the site, and a chart drawn up plotting gauge reading versus applied jacking force.

Jacks shall incorporate a provision for hydraulically or manually locking off the wedges to limit draw in to 8 mm. If the draw in on anchoring is greater than 8 mm, then the strand shall be restressed.

Stressing acceptance criteria are as follows:

1. Acceptance at +/- 5% of the theoretical extension. 2. More than 5% of theoretical extension shall be investigated and reported on

by the specialist designer and will be subject to Icon Water instruction to unstress and restress and/or liable to rejection.

Cable extensions shall be calculated and measured on the basis that an initial force sufficient to remove all slack is applied before measurements are commenced.

All stressing tendon ducts shall be grouted after acceptance to do so by Icon Water is issued.


4.29. Design and construction of welded steel reservoirs

4.29.1. Welded steel alternative

Other clauses of this standard specification contain specific requirements or options for welded steel reservoirs. The requirements in this clause are in addition to the other clauses that are specific to the welded steel reservoir alternative.

All materials included in the design and construction of welded steel reservoirs shall all comply with AS/NZS 4020 including sealants, seals and coatings.

4.29.2. Welded steel construction methodology

The constructor shall be required to provide a construction methodology for acceptance by Icon Water. When requested by Icon Water the constructor shall conduct a workshop including his structural designer, the fabricator and Icon Water personnel to confirm the construction methodology.

The workshop will be used to confirm the details, methods and inspection points of the construction.

At least the following inspection points shall be observed and minimum of 48 hours notice shall be given to Icon Water for each:

1. HOLD POINTS: a. Submission for acceptance by Icon Water of work method

statements; b. Submission for acceptance by Icon Water of reservoir floor and wall

design drawings; c. Submission for acceptance by Icon Water of reservoir roof design

drawings; d. Submission for acceptance by Icon Water of shop drawings of

steelwork including identification marks specified below; e. Submission for acceptance by Icon Water of welder qualifications; f. Testing of welding procedures; and g. Surface preparation prior to protective coating.

2. WITNESS POINTS: a. Completion of formwork and reinforcement placement for the ring

beam under the floor and wall prior to commencement of concrete placement;

b. Completion of under floor pipework and drainage; c. Completion of testing of under floor bedding; d. Commencement of steelwork fabrication; e. Commencement of steelwork installation on site; f. Vacuum testing of floor welds; g. Completion of erection prior to surface preparation for protective

coating; and h. Completion of each coat of protective coating.

Suitable and sufficient component identification marks or other means for identifying each member shall be provided on drawings and for the correct setting out, location, erection and connection of the steelwork. Bolted connections shall be marked to show the bolting category.

Bedding under the steel floor shall be clean and washed sand which is free of chloride ions. Minimum depth of sand bedding shall be 50 mm deep and be placed on undisturbed soil.


4.30. Valve Chambers and Drainage Pits

Valve chambers and drainage pits shall be cast in situ, reinforced concrete. A minimum of 50 mm cover to reinforcement on both faces shall be provided. Valve chambers for pressure reducing valves shall be totally enclosed and treated internally with acoustic material. Other valve chambers shall be designed for entry at ground level.

Drainage pit covers shall be no smaller than 900 mm diameter or 900 by 900 mm clear opening. Covers on drainage pits shall generally be hot dip galvanised grating with hold down bolts, with hinged aluminium chequer plate access hatches. Hot dip galvanised chequer plate covers shall be provided over all electrically actuated or solenoid operated valves. All covers shall be free of trip hazards. All screwed down covers shall use minimum of M12 size countersunk grade 316 (A4) fasteners.

The valve chambers and drainage pit shall be located outside of the 4500 mm wide hardstand reservoir access required by clause 4.9.

The drainage pits shall be 300 mm above finished ground level to avoid the requirement for handrails required by AS 1657 and to be high enough to limit the potential for vehicles to drive onto the pit.

Concrete formwork shall be provided to both the internal and external faces. The valve chambers and drainage shall have 20 mm by 45o chamfer on all exposed, external concrete corners.

All anchors in valve chambers and drainage pits shall be minimum size M12 chemical anchors with grade 316 (A4) stainless steel bolts, nuts and washers.

4.31. Surface protection

4.31.1. Concrete reservoir alternative

Unless required otherwise by the development consent, concrete reservoirs shall be painted externally only to a height of 3 m above ground level with a paint system complying with Icon Water Standard Specification Surface Protection system S24 and then over coated with system S25. Unless required otherwise by the development consent, finish colour shall be Koala Grey (N45) to AS 2700S. Surfaces to be painted shall be completely dry and free from any dust and deleterious matter. Do not paint over moist concrete surfaces. Do not paint under damp or windy weather conditions which may affect the drying of paint.

Unless required otherwise by the development consent, the stairway cladding external finish colour shall match the external wall finish colour.

4.31.2. Steel reservoir alternative

Reservoir internal steel work shall be coated with system S5 of Icon Water Standard Specification Surface Protection. Finish colour shall be white (N14) to AS 2700S.

Reservoir external steel wall shall be coated with system S4 of Icon Water Standard Specification Surface Protection. This system on the walls shall be over coated with system S25 to a height of 3 m above ground level. Unless required otherwise by the development consent, the external wall finish colour shall be Koala Grey (N45) to AS 2700S.

Unless required otherwise by the development consent, the stairway cladding external finish colour shall match the external wall finish colour.


4.32. Stainless steel

Fabricated stainless steel shall be passivated in accordance with system S21 of Icon Water Standard Specification Surface Protection.

4.33. Cathodic Protection

Cathodic protection is not required.

4.34. Drawings

4.34.1. Design drawings

Design drawings for reservoirs shall be drawn in accordance the Icon Water Drafting Standard (Reference 2). Design drawings required shall include:

1. Site layout drawings of the whole site including security fence layout; 2. Drainage drawings; 3. Access road drawings; 4. Reservoir general arrangement showing location of inlet, outlet, overflow, scours; 5. Under floor drainage partitioning and pipework location; 6. Process and instrumentation diagrams; 7. Light weight roof structure drawings unless the project requires steel panel roof; 8. Roof access hatch general arrangement and detail drawings including safety

equipment; 9. Reservoir internal ladder and intermediate landing; 10. Skylight drawings 11. External stairway drawings 12. Valve chambers and drainage pits including all pipework, structural steelwork,

covers, concrete reinforcement, safety equipment, ladders, drainage, embedded electric conduits, acoustic treatment;

13. Desilting pond drawings 14. Pipework and equipment layout drawings 15. Electrical and instrumentation layout drawings 16. Switchboard detail drawings 17. Cable tray arrangement 18. Buried conduit layout drawings 19. Embedded conduit arrangement 20. Single line electrical drawings 21. Power supply layout drawings 22. Communications and telemetry drawings

Additional drawings other than those listed may also be specified to be provided as part of the design.

4.34.2. Shop drawings

Shop drawings of the structural steelwork prepared in accordance with Icon Water Drafting Standard shall be submitted to Icon Water for acceptance. Shop drawings shall show the details of each assembly, component and connection, together with information relative to fabrication, surface treatment and erection, including the following:

1. Identification marks; 2. Steel type and grade; 3. Dimensions of items; 4. Fabrication methods including, where applicable, hot or cold forming and

post weld heat treatment; 5. Location, type and size of welds or bolts;


6. Weld categories and bolting categories: 7. Orientation of members; 8. Location of temporary connections; 9. Procedures necessary for shop and site assembly including temporary

bracing; 10. Lifting and support points for handling and transport; 11. Temporary bracing, if required for handling and transport; 12. Required fixings, attachments and brackets for joining structural members

and for other components; and 13. Surface preparation methods and coating system details and extent of

each system.

4.34.1. Work as executed drawings

Work as executed drawings for reservoirs shall be drawn in accordance the Icon Water Drafting Standard (Reference 2) and Icon Water Standard Specification – Work As Executed Drawings (when available). Also, work as executed drawings shall comply with the specific requirements of this standard specification.

4.35. Training and Handover

Detailed training of Icon Water personnel in the use, operation and maintenance of the reservoir and all associated equipment and facilities shall be provided before the handover of the project. The level of training required will be dependent on the scope of the project. Training shall include two components:

1. on site training – what components, where are they, what do they look like 2. classroom training – how and why.

The detailed training shall include coverage of:

1. use and operation of the reservoir equipment provided as part of the project 2. maintenance instructions for the reservoir equipment 3. troubleshooting of the reservoir equipment faults.

5. Definitions

Operations Telemetry Network in this standard specification means the automated communications system by which measurements are made, acquired, transmitted to receiving equipment for monitoring, recording and control and includes control communications to the equipment. Security Telemetry Network in this standard specification means the automated communications system by which facility access is monitored and controlled and intruder detection is monitored. Sewerage Network has the same meaning as defined under the Utilities Act 2000 s14, namely:

(1) For this Act, a sewerage network consists of the infrastructure mentioned in subsection (2) used, or for use, in relation to the provision of sewerage services by a person to premises of another person.

(2) For subsection (1), the infrastructure consists of the following: (a) sewage storages, trunk sewers, mains and treatment plants; (b) pumps, facilities and equipment for conveying sewage, or monitoring or controlling the conveyance of sewage; (c) pipes or equipment; (d) any other thing ancillary to any other part of the infrastructure.


Water Network has the same meaning as defined under the Utilities Act 2000 s12, namely:

(1) For this Act, a water network consists of the infrastructure mentioned in subsection (2) used, or for use, in relation to any of the following purposes:

(a) the collection and treatment of water for distribution by a person to premises of another person;

(b) the distribution of water by a person for supply to premises of another person. (2) For subsection (1), the infrastructure consists of the following: (a) water storages, mains and treatment plants; (b) pumps, facilities and equipment for distributing water, or monitoring or

controlling the distribution of water; (c) pipes or equipment; (d) any other thing ancillary to any other part of the infrastructure.

6. Standard Drawings

This standard specification shall be read in conjunction with Icon Water Standard Drawings, including:

1. SDW-C002 Project Sign 2. SDW-C003 Signage Sheet 1 3. SDW-C004 Signage Sheet 2 4. SDW-C005 Chain Link Security Fence Sheet 1 5. SDW-C006 Chain Link Security Fence Sheet 2 6. SDW-C007 Chain Link Security Fence Sheet 3 7. SDW-C008 Welded Mesh Security Fence Sheet 1 8. SDW-C009 Welded Mesh Security Fence Sheet 2 9. SDW-C010 Welded Mesh Security Fence Sheet 3 10. SDW-C011 Welded Mesh Security Fence Sheet 4 11. SDW-C020 Reservoir Desilting Pond Outlet 12. SDW-C021 Reservoir Access Hole Assembly 13. SDW-C022 Reservoir Roof Skylights and Vent 14. SDW-H011 Sampling Point Suburbs and Reticulation Water Mains 15. SDW-H012 Sampling Point Pump Stations Reservoirs and Distribution Water

Mains 16. SDW-E001 Electrical Symbols Sheet 1 17. SDW-E002 Electrical Symbols Sheet 2 18. SDW-E003 Electrical Symbols Sheet 3 19. SDW-E004 Electrical Control Station Upstand and Cable Ladder and Tray

Mounting Details 20. SDW-E005 Underground Cables 21. SDW-M020 Reservoir Rechlorination Injection Quill 22. SDW-P001 P&ID Symbols Sheet 1 23. SDW-P001 P&ID Symbols Sheet 2 24. SDW-P001 P&ID Symbols Sheet 3 25. SDW-S020 Roof Guardrails and Platform 26. SDW-S021 Roof Access Hatch 27. SDW-S022 Internal Ladder 28. SDW-S023 Reservoir Access Tower Sheet 1 29. SDW-S024 Reservoir Access Tower Sheet 2


7. References

1. Icon Water - Preferred Equipment Lists 2. Icon Water - Drafting Standard 3. Icon Water - Standard Specification - Telemetry 4. Icon Water - Water Network Design Criteria

design standards standard specification water network

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