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Demonstrate knowledge of water supply and reticulation systems
Level
3
Credits
10
Purpose
People credited with this unit standard are able to describe: the purpose and
components of water supply systems; the hydraulics of a water reticulation
system; the operation of a water reticulation system; and the procedures for
water supply mains shut-down and re-commissioning.
This unit standard is for people who work in water reticulation systems.
Subfield
Water Industry
Domain
Water Reticulation
Status
Registered
Status date
19 September 2008
Date version published
19 September 2008
Planned review date
31 December 2013
Entry information
Open.
Replacement information
This unit standard replaced unit standard 19208.
Accreditation
Evaluation of documentation by NZQA and industry.
Standard setting body (SSB)
Primary Industry Training Organisation
Accreditation and Moderation Action Plan (AMAP) reference
0179
This AMAP can be accessed at http://www.nzqa.govt.nz/framework/search/index.do.
Special notes
1
References
Legislation and bylaws relevant to this unit standard include but are not limited to the
Health Act 1956, Local Government Act 2002, and Water Supply Bylaws.
Drinking-Water Standards for New Zealand, Ministry of Health, Wellington, 2000 and
2005.
 New Zealand Qualifications Authority 2016
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2
Definition
Organisational procedures – instructions to staff, and procedures which are
documented in memo or manual format and are available in the workplace. These
requirements include but are not limited to – site specific requirements,
manufacturers’ specifications, product quality specifications, and legislative or
regulatory requirements.
Elements and performance criteria
Element 1
Describe the purpose and components of water supply systems.
Performance criteria
1.1
The purpose of water supply systems is described in terms of protection of
public health.
Range
1.2
Raw water is described in terms of types, and factors that affect quality and
quantity.
Range
1.3
impoundments, supply mains, pumps, races, wells.
Treatment options are described in terms of their purpose.
Range
1.5
types – fresh and saline water, true groundwater;
factors that affect quality – pollution, chemicals, pesticides, saline
intrusion, contamination, variation due to weather;
factors that affect quantity – flow reliability, competition for water
uses, storage, variation due to weather.
Raw water systems are described in terms of their size and elevation.
Range
1.4
includes but is not limited to – Health Act requirement for adequate
water supply, uses of water, potability of water, ability to prevent
endemic diseases, disease outbreak due to non-potable supplies,
back flow prevention.
course screening, sedimentation, chemical coagulation, filtration
by conventional or mechanical means, pH correction, fluoridation,
disinfection.
Primary distribution systems to deliver water from treatment plant to reservoir
are described in terms of supply security and peak flow management.
Range
reservoir capacity, elevation, control valves, monitoring and control
systems, service reservoirs; pumping costs, hour of day.
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1.6
Reservoirs are described in terms of their position, functions, and valving.
Range
1.7
Trunk, reticulation, and rider mains and fittings are described in terms of their
functions and layout.
Range
1.8
diurnal peak storage and attenuation, fire reserves, elevation
control, supply loss storage, inlet and outlet arrangements,
drain/overflow lines, bypass valves, check valves, flow meters.
capacities, flow rates, pressure drops, ring mains, fire flows, fire
hydrants, valves.
Property services connections are described in terms of their component parts
and sizing.
Range
components of connections – tees, tapping bands, saddles,
anglecocks, ferrule, service pipe, backflow preventor, meters, toby
boxes, tail pipes, isolation valve.
Element 2
Describe the hydraulics of a water reticulation system.
Performance criteria
2.1
The concept of pressure is described in terms of static pressure, variation of
pressure, and its affect on hydraulic grade lines.
2.2
Sources of pressure losses are described in terms of flow rate changes.
2.3
Variation of pressure loss is described in terms of flow rate changes.
2.4
Internal pipe pressure forces are described in terms of anchorage requirements.
Range
2.5
jointing methods, end caps, bends, anchor blocks, ground
loadings.
The role of pumps is described in terms of the impact on hydraulic grade lines.
Element 3
Describe the operation of a water reticulation system.
Performance criteria
3.1
The identification and impacts of leaks are described in terms of system
operation.
Range
identification – night flow tests, correlator tests, acoustic detection;
impacts – water losses, pavements, foundations, land use,
financial.
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3.2
Water flow meters are described in terms of their applications, installation, and
features.
Range
3.3
Poor water quality is described in terms of causes, impacts, and control.
Range
3.4
features – accuracy, data collection, income collection;
evidence is required for at least two types of water meters.
causes – low pressure areas, long detention times, dead ends;
impacts – low chlorine levels and forms, ‘dead spots’, taste, odour,
appearance, backflow, low pressure areas;
control – flushing, backflow prevention, pipe refurbishment.
Corrosion and hard water are described in terms of causes and impacts.
Range
causes – pH levels, hardness and alkalinity, pipe materials;
impacts – metal corrosion, asbestos corrosion, hard water
impacts, treatment options and costs.
Element 4
Describe the procedures for water supply mains shut-down and re-commissioning in
accordance with organisational procedures.
Performance criteria
4.1
Action plan for water supply mains shut-down and re-commissioning is
described.
Range
4.2
includes but is not limited to – time, contingencies, trial shut-down.
Notification procedures of affected people or organisations are described.
Range
service providers include but are not limited to – fire service;
key clients include but are not limited to – businesses, schools,
hospitals;
private clients include but are not limited to – people on dialysis;
client call centre.
4.3
The shut-down procedure is described.
4.4
Procedures to action contingencies are described.
Range
includes but is not limited to – temporary water supply.
4.5
Procedures for re-commissioning the water supply are described.
4.6
Procedures for notifying the client call centre are described.
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Please note
Providers must be accredited by NZQA, or an inter-institutional body with delegated
authority for quality assurance, before they can report credits from assessment against
unit standards or deliver courses of study leading to that assessment.
Industry Training Organisations must be accredited by NZQA before they can register
credits from assessment against unit standards.
Accredited providers and Industry Training Organisations assessing against unit standards
must engage with the moderation system that applies to those standards.
Accreditation requirements and an outline of the moderation system that applies to this
standard are outlined in the Accreditation and Moderation Action Plan (AMAP). The
AMAP also includes useful information about special requirements for organisations
wishing to develop education and training programmes, such as minimum qualifications for
tutors and assessors, and special resource requirements.
Comments on this unit standard
Please contact the Primary Industry Training Organisation standards@primaryito.ac.nz if
you wish to suggest changes to the content of this unit standard.
 New Zealand Qualifications Authority 2016