NZQA registered unit standard
22113 version 3
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Title
Demonstrate knowledge of flows in wastewater and flow
measurement techniques
Level
4
Credits
Purpose
4
People credited with this unit standard are able to demonstrate
knowledge of external factors affecting wastewater flows, and
flow measurement techniques for wastewater.
This unit standard is for people who supervise maintenance
and operations in water reticulation, and people who work in
specialist water reticulation activities.
Classification
Water Industry > Water Reticulation
Available grade
Achieved
Explanatory notes
1
Legislation includes but is not limited to – Health Act 1956, and Resource
Management Act 1991.
2
Definition
Water reticulation – in this context refers to all pipe systems, pumping systems, and
components that contribute to the collection and disposal of wastewater and
stormwater.
Outcomes and evidence requirements
Outcome 1
Demonstrate knowledge of external factors affecting wastewater flows.
Evidence requirements
1.1
Sewer flows are described in terms of design criteria for pipe capacity.
Range
1.2
flows – domestic, commercial, industrial.
Sewer flows are described in terms of the reasons for their variability.
Range
includes but is not limited to – diurnal variation related to water
use, seasonal variation related to inflow and infiltration, wet
weather events.
Primary Industry Training Organisation
SSB Code 101558
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
1.3
Inflow, infiltration, and exfiltration are described and distinguished in terms of
source and potential causes.
Range
1.4
causes include but are not limited to – leaking pipe joints, gully
traps, manholes, illegal connections;
reticulation type – combined, separate.
Excessive infiltration and exfiltration are described in terms of their
consequences.
Range
1.5
22113 version 3
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flooding, property damage, wastewater asset damage, public
health risks, environmental damage, impact on wastewater
treatment.
Methods used to identify, prevent, or reduce inflow, infiltration, and exfiltration
are described in terms of their techniques.
Range
closed circuit television (CCTV), property inspection, smoke
testing, dye testing, flow gauging, network modelling, pipe line and
manhole rehabilitation.
Outcome 2
Demonstrate knowledge of flow measurement techniques for wastewater.
Evidence requirements
2.1
Gravity flow measurement is described in terms of methods used.
Range
2.2
Pressure flow measurement is described in terms of the meter types used.
Range
2.3
weirs, flumes; open channel meters – velocity measurement and
ultrasonic or pressure depth sensors.
venturi, magflow, ultrasonic.
Network flow simulation models are described in terms of their type, operation,
and purpose.
Range
Planned review date
computer simulation of wastewater network; calibration using fieldbased flow metering; future network infrastructure planning; flow
catchment studies – inflow and/or infiltration reduction
programmes.
31 December 2016
Primary Industry Training Organisation
SSB Code 101558
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
22113 version 3
Page 3 of 3
Status information and last date for assessment for superseded versions
Process
Version Date
Last Date for Assessment
Registration
1
26 October 2005
31 December 2016
Rollover
2
20 February 2009
31 December 2016
Rollover
3
21 July 2011
N/A
Consent and Moderation Requirements (CMR) reference
0179
This CMR can be accessed at http://www.nzqa.govt.nz/framework/search/index.do.
Please note
Providers must be granted consent to assess against standards (accredited) by NZQA,
before they can report credits from assessment against unit standards or deliver courses
of study leading to that assessment.
Industry Training Organisations must be granted consent to assess against standards by
NZQA before they can register credits from assessment against unit standards.
Providers and Industry Training Organisations, which have been granted consent and
which are assessing against unit standards must engage with the moderation system that
applies to those standards.
Requirements for consent to assess and an outline of the moderation system that applies
to this standard are outlined in the Consent and Moderation Requirements (CMRs). The
CMR 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.
Primary Industry Training Organisation
SSB Code 101558
 New Zealand Qualifications Authority 2016