De les dificultats dels infants

Information submitted to the Commission / Certifying Agency shall cover civil, hydraulic, earthworks, structural, geotechnical, drainage, mechanical, electrical and telemetry system designs pertaining to external reticulation systems and associated appurtenances, service reservoirs, supply mains, pumping stations and storage cisterns and access roads where required. The submissions for mechanical and electrical works, and instrumentation and control systems, are described in Parts D, E and F of these Uniform Technical Guidelines respectively.

In addition to the three (3) sets of A1 size drawings, the submissions shall be accompanied by two (2) sets of a Detailed Design Report and a copy of Standard Technical Specifications that are to be applied. Where standard specifications issued or recognized by Commission / Certifying Agency are adopted, copies of

Drawings shall be submitted in AutoCad format and shall include one (1) compact disc containing electronic (soft) copy of all related drawings and calculations in word format.

Drawings, calculations and works specifications shall be endorsed by a competent person that is appointed by the owner, developer or WDL (in the case of the design of common supply mains and centralized service reservoirs only). Confirmation of appointment of the competent person shall be submitted to the Commission / Certifying Agency.

Basic information that should be supplied to the Commission / Certifying Agency includes:

 Definitions of standard symbols used in the Drawings.

 Layout plans for the external reticulation system, and its primary appurtenances.

 Layout plans and sectional details for pumping stations and associated suction cisterns.

 Layout plan and sectional details for Service Reservoirs.

 Plan and profile of supply mains.

 Copies of approval letters from the WDL relating to source of supply, and from the Commission / Certifying Agency with respect to conceptual designs.

 Standard Drawings other than those issued by the Commission / Certifying Agency.

 Hydraulic calculations pertaining to supply mains, pumping mains and reticulation networks.

The Detailed Design Report shall present the final criteria employed for hydraulic, civil, structural, geotechnical, road, drainage, mechanical, electrical and instrumentation designs.

All design submissions including layout plans for civil works, mechanical and electrical (M&E) and instrumentation systems can be submitted together to the Commission / Certifying Agency for approval.

For communication pipelines, the Competent Person shall submit location details of the tapping point, and the size and material of the approved public mains to which the communication pipes is to be connected. Furthermore the general layout and profile of the communication pipes, ferrule, valves and meter stands shall be provided. Submissions to the Commission / Certifying Agency shall comprise of three (3) sets of A1 size drawings, two (2) sets of a Design Report and a copy of Technical Specifications.

B.3.2 External Reticulation Networks

The technical submission for external reticulation networks shall comprise of the following as a minimum requirement:

 An outline description of the external reticulation system that is proposed to be implemented for a particular phase of development.

 Water demand table showing the types of development, corresponding number of units per development type, unit water demand rates for each type of development, and the sectoral and cumulative daily water demands.

 Calculations of external reticulation pipe design catering for peak flow, and for fire flow and average flow conditions.

 Justification for the selection of type of class of pipe based on imposed loads of backfill, depth of cover, pipe strength and bedding details.

 Detailed pipe layout plans pertaining to the external reticulation system that are coloured according to types and sizes of pipes.

 Hydraulic calculations for the reticulation system shall include the following information:

HWC = Hazen William Coefficient

HL = Head Loss

HGL = Hydraulic Grade Line HSL = Highest Supply Level

B.3.3 Service Reservoirs and Suction Cisterns

The detailed technical submissions for service reservoirs and suction cisterns shall include:

 Reservoir Location Plan.

 Justification for type and size of service reservoir including material selection and setting of Bottom Water Level (BWL) and Top Water Level (TWL).

 Detailed layout plan of reservoir or suction tank showing location, side views, top and sectional views, details of levels, incoming water pipe, outgoing water pipe, overflow and scour pipes, valve locations, level indicator, ventilation system, walk-up stairs, security fencing and water sampling stations.

 Structural design including the design calculations and design criteria for suction tank or service reservoir endorsed by the competent person.

 Design calculations to support layout and details of storm water drain size and the type of overflow or scour systems, and other drainage facilities that will be employed to evacuate excess waters from the reservoir site for discharge to an external main drain system.

 Design check to verify capability of external main drain system to accommodate evacuation of excess water from the facility site.

 Calculation and sizing of scour pipe for the reservoir or suction cistern.

 Detailed drawings for the proposed access road.

 Schematic drawings and telemetry components and overall system.

B.3.4 Supply Mains

 Brief description of proposed water source, location of tapping point and safe water pressure, as determined by the WDL, at the tapping point.

 Pipeline route from proposed tapping point to service reservoir / suction cistern. The A3 size (1:1,500 scale) drawings should also include information on the Top Water Level (TWL) and Bottom Water Level (BWL) and size of mains. Longitudinal sections shall be in scale of 1:1,000 (vertical) and 1:1,000 (horizontal).

 Location of all isolation, scour and air valves along the supply mains.

 Description of valve chambers, thrust blocks and drain and culvert crossings.

 Overall and phased water demand in tabulated form.

 Hydraulic calculations indicating available pressure along the pipeline route based on the pipeline conveying a peak flow equivalent to 1.2 times the estimated daily water demand.

B.3.5 Pumping Stations

The detailed technical submissions for pumping stations shall include:

 Location plan for the pumping station.

 Access roads and internal roads within site including parking bays if relevant.

 Floor plan, side and sectional views including all relevant reduced levels of pumping station showing the pump locations, arrangement of pumping system including suction pipe from suction cistern to pumps, pumping mains, pipe fittings, pipe trenches, motor, switchboard, surge suppression system and details of levels.

 Detailed drawing showing the supports and foundation arrangements for pump sets with base plate dimensions and the positions of all foundation bolts and pipe connection, chequered plate and all necessary information for a complete design.

 Design for storm drainage and connection to an external main drain; and design check to verify main drain system to accommodate storm flows from facility site.

 Schematic diagrams of telemetry components and systems.

B.3.6 Geotechnical Submissions Pertaining to Service Reservoirs and Pumping Stations

a. Design Proposals

The competent person shall perform and submit a detailed analysis of all major systems and/or structural components that are proposed for the project, including geotechnical and foundation components. Aspects of design and construction that depend on the subsoil and on groundwater conditions shall be reviewed and approved by a professional geotechnical engineer.

Each design proposal shall include but shall not be limited to the following submittals:

 Site Investigation Report

The Competent Person shall properly plan and specify the scope of site investigations to be carried out for the works after a desk study and site reconnaissance, including reviewing all available information pertaining to the site and adjacent areas. The methods of site investigation, and sampling for laboratory tests, must be adequately specified, and take into account the type of development to be undertaken and the prevailing ground conditions. Guidance for site investigations shall be as per MS 2038:2006 or any subsequent revisions to the standard, and in accordance with Circular No. 4/2005 entitled “Engineer’s Responsibility for Subsurface Investigation” issued by Board of Engineers, Malaysia.

 Geotechnical Interpretative Report, which shall contain:

- References to desk study, factual and interpretative reports, and any other contractual document relating to the project.

- An interpretation of the site geology including description of site and its surroundings and clearly indicating the subsoil, ground water and foundation conditions and flood plain elevations, etc.

- Engineering interpretation of the implications of ground conditions on the development of facilities identified in this sub-section.

 Geotechnical Design Report, which shall furnish:

- Assumptions, data and methods of verifying the safety and serviceability of the geotechnical work (e.g. method of calculation).

- Design values of soil and rock properties, including any necessary explanation for their selection.

- Statements on any codes, design guides and standards used.

- Engineering calculations for:

 Shallow and/or deep foundations including bearing capacity calculations and settlement predictions.

 Slope stability analysis including stabilization measures, if any.

 Earth retaining structures.

 Other geotechnical works including excavation support systems, ground improvement works, etc.

 Recommendations for slope stabilization and protection works, maintenance measures, earth-retaining structures and other geotechnical considerations.

 Engineering Plans, Drawings and Specifications which must be prepared, endorsed and signed by the Competent Person.

 Further testing requirements for design validation where necessary.

 Details of potential construction impacts such as anticipated loading and any imposed deformations.