6.3Sustainability
Sustainability must be designed into the development process. At least the following should be confirmed (preferably in the Design Report) before going out to tender:
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Name of the identified WSP;
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Budgeted Operation and Maintenance costs;
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Amount allocated for basic water supply;
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Cost recovery mechanisms and expected revenue;
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Other sources of operating funds (such as Equitable share).
6.4Drawings
Drawings should generally comply with the following standards:
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All drawing work shall be done on A1, or smaller size sheets with the client’s standard title block. All electrical drawings to be A3.
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The drawings remain the property of the Client.
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The minimum letter size is 3mm.
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All drawings shall be signed by the employer or his representative.
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Alterations to drawings may only be authorised by the employer or his representative.
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Index drawing sheets of the complete scheme or part thereof as per type drawing, must be drawn up giving a list of all drawings with their description and must be subsidised in sections with appropriate section headings. Reference must be made on all drawings to these index drawing numbers.
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Every project shall have a compilation/ property diagram drawing(s), showing the required expropriation and/or servitude requirements for bulk water pipelines up to the revenue flow meter and associated dimensions.
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Cross sections on drawings shall be consecutively numbered for each part of the project. The number and section as well as the sheet number where the section is shown must be indicated on the drawing where the position of the section is shown, i.e. 49 section number 12 sheet number
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Pipeline drawings shall contain a summarised complete profile drawing(s) indicating the pipeline profile, design and field test pressure lines, pipeline and valves' major characteristics.
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Detailed profile drawings shall contain a plan view showing major topographical features, property boundaries and all other items as per DWS 1110 clause 4.1 (See Design Folder for Standard Specifications).
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Drawings prepared by the Consulting Engineer must bear a partners or directors signature.
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Drawings prepared by the Contractor must be thoroughly checked by the Consulting Engineer with particular regard to compatibility with proposed, adjoining or existing works.
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Manufacturers’ drawings shall be supplied as specified in mechanical contracts and wiring and circuit diagrams shall be supplied as specified in electrical contracts.
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Where civil works are based on plant layout drawings prepared by the mechanical/electrical contractor, the drawings shall be formally approved by the mechanical/electrical representative of the employer, after which the layout may not be altered without repeating the procedure.
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On completion of the works the original drawings must be updated to the “AS BUILT” condition, clearly marked "AS BUILT” and all drawings returned to the employer or his representative for safekeeping in a format as specified. The original will be returned to the Consulting Engineer for his records. Submitted not later than 3 months after completion of the project.
Approval of the specification or drawing shall not absolve the Consulting Engineer of any responsibility.
6.5Standard drawings
A number of standard drawings are included in the Drawings Folder. CAD software is required to read these drawings.
6.6Special drawing requirements and operating and maintenance manuals
Special requirements for drawings for tendering, manufacturing, and construction of a mechanical/electrical nature and special requirements for mechanical and electrical operating and maintenance manuals are included in the Design Folder.
6.7Design specifications
The following DWAF specifications are relevant to the design of Community Water Supply Schemes and are included in the Specifications Folder. DWAF gives its approval to any municipality or water board to use or adapt, for their own purposes, any of these specifications:
NUMBER
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DESCRIPTION
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DWS 0510
|
Drilling and grouting
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DWS 0750
|
Water retaining concrete
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DWS 1110
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Construction of pipelines
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DWS 1130
|
Design, manufacture and supply of steel pipes
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DWS 1131
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Lining and coating of steel pipes and specials
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DWS 1140
|
Design, manufacture and supply of asbestos-cement pressure pipes and joints
|
DWS 1150
|
Glass reinforced plastics (GRP) pipes and joints for use for water supply
|
DWS1160
|
Design, manufacture, supply, and installation of Polyvinyl Chloride (PVC) Pressure Pipes and fittings
|
DWS 1710
|
Bricklaying
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DWS 1720
|
Plasterer, tiler, and floorer
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DWS 1730
|
Glazing and painting
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DWS 1740
|
Plumbing
|
DWS 1810
|
Specialist services
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DWS 1910
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Supply, delivery, installation and commissioning of mechanical and electrical equipment for a bio-filter plant
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DWS 1930
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Supply, installation and commissioning of water treatment plant equipment
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DWS 1940
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Design, manufacture, supply, delivery, installation and commissioning of package water treatment plant
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DWS 1950
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Supply, installation and commissioning of a reverse osmosis unit for the desalination of mineralised water
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DWS 2010
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Boundary fencing
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DWS 2410
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Landscaping
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DWS 2510
|
Valves (set of specifications)
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DWS 9900
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Corrosion protection (set of specifications)
|
DWS GTE
|
General Technical Specifications (Electrical)
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