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Demonstrate knowledge of, and evaluate, a small drinking-water supply
Level
4
Credits
6
Purpose
People credited with this unit standard are able to, for a small drinking-water
supply, demonstrate knowledge of: the factors affecting the quality and
quantity of water available from water sources and catchments; water
treatment processes; the components used for drinking-water reticulation
from storage to taps; monitoring and recording procedures to determine the
safety and quality of drinking-water; and evaluate a small drinking-water
supply for improvements.
Subfield
Water Industry
Domain
Drinking-Water
Status
Registered
Status date
20 April 2006
Date version published
20 April 2006
Planned review date
31 December 2009
Entry information
Open.
Accreditation
Evaluation of documentation and visit by NZQA, industry
and teaching professional in the same field from another
provider.
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/site/framework/search.html.
Special notes
1
Legislation includes but is not limited to the – Health Act 1956, Local Government Act
2002, Consumer Guarantees Act 1993, Building Act 2004, and Resource
Management Act 1991.
 New Zealand Qualifications Authority 2016
22873 version 1
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2
Definitions
Small drinking-water supply – a drinking-water supply servicing up to 500 people;
and which includes catchment, source, treatment, and reticulation.
Secure ground water – water contained beneath the land surface which is abstracted
via a secure well head or similarly proven structure, and has been demonstrated to
show that contamination by pathogenic or harmful organisms is unlikely.
UV – ultraviolet.
3
Some Marae are using traditional Māori indicators to determine water quality, for
example, amount of algae and weed growth, presence of algae on rock, flow rate,
and smell.
4
Standard
Ministry of Health, Drinking-water Standards for New Zealand 2005 (Wellington,
2005) available from http://www.moh.govt.nz/water.
Elements and performance criteria
Element 1
Demonstrate knowledge of the factors affecting the quality and quantity of water available
from water sources and catchments for a small drinking-water supply.
Performance criteria
1.1
Water sources and catchments are described in terms of the factors affecting
quality, and the consistency of quality of water.
Range
1.2
Water sources and catchments are described in terms of the factors affecting
availability and reliability of supply, and the need for storage.
Range
1.3
surface or surface-influenced water, secure ground water.
factors include but are not limited to – less rain, more rain.
Source water is described in terms of the contaminants identified in the
Drinking-water Standards for New Zealand 2005.
Range
contaminants – microbiological pathogens, blue-green algae;
chemical, aesthetics, corrosion.
Element 2
Demonstrate knowledge of water treatment processes for a small drinking-water supply.
Performance criteria
2.1
Water treatment processes and water quality parameters are described in terms
of barriers and suitability of supply.
Range
turbidity, iron, flow rate.
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2.2
Settlement processes are described in terms of their effect on contaminant
removal.
2.3
Water treatment filtration processes are described in terms of their effect on
contaminant removal, maintenance, and cost.
Range
2.4
Water treatment disinfection processes are described in terms of their effect on
microbiological contaminants, and the dose rates required.
Range
2.5
UV; chlorine – liquid, gas, solid.
Water treatment pH control processes are described in terms of their aesthetic
impact, and corrosion control.
Range
2.6
two of – sand, cartridge, membrane, mechanical.
impact on the system corrosion, ideal levels in the drinking-water
system, methods for testing, methods of correcting, impact on
disinfection.
Water treatment processes are described in terms of their inter-relationships.
Element 3
Demonstrate knowledge of the components used for drinking-water reticulation from
storage to taps for a small drinking-water supply.
Range
tanks, pipes, pumps, control valves, backflow preventors.
Performance criteria
3.1
Components used in reticulation are described in terms of their function.
3.2
Components used in reticulation are described in terms of hygienic methods of
maintenance.
Element 4
Demonstrate knowledge of monitoring and recording procedures to determine the safety
and quality of drinking-water for a small drinking-water supply.
Performance criteria
4.1
Sampling results, and frequency of and reasons for, drinking-water monitoring
are compared in accordance with the requirements of the Drinking-water
Standards for New Zealand 2005.
4.2
Maintenance of drinking-water monitoring records is described in accordance
with Drinking-water Standards for New Zealand 2005.
 New Zealand Qualifications Authority 2016
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Element 5
Evaluate a small drinking-water supply for improvements.
Range
source and catchment, treatment, reticulation, monitoring.
Performance criteria
5.1
A small drinking-water supply is described in terms of its components.
5.2
A small drinking-water supply is evaluated, and viable options for improvement
are identified and described.
Please note
Providers must be accredited by the Qualifications Authority, 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 the Qualifications Authority 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