11136 version 5
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Measure tidal streams and currents
Level
5
Credits
6
Purpose
This unit standard is for people working in the hydrography sector of the
surveying profession.
People credited with this unit standard are able to: prepare equipment for
tidal stream and current measurement; deploy and recover tidal stream and
current recording equipment; demonstrate knowledge of tidal stream and
current measurement and methods; conduct a tidal stream measurement;
and analyse tidal stream and current data.
Subfield
Surveying
Domain
Hydrography
Status
Registered
Status date
25 February 2008
Date version published
25 February 2008
Planned review date
31 December 2012
Entry information
Open.
Accreditation
Evaluation of documentation and visit by NZQA and
industry.
Standard setting body (SSB)
Infrastructure ITO
Accreditation and Moderation Action Plan (AMAP) reference
0101
This AMAP can be accessed at http://www.nzqa.govt.nz/framework/search/index.do.
Special notes
1
The following legislation and documentation must be complied with:
Health and Safety in Employment Act 1992;
TH Standard 31 Standards for Hydrographic Surveys (HYSPEC) v3 (Wellington:
National Topographic/Hydrographic Authority, 2001), available at
http://www.linz.govt.nz;
 New Zealand Qualifications Authority 2016
11136 version 5
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IHO Standards for Hydrographic Surveys, Special Publication No 44 (Monaco:
International Hydrographic Organisation, 1998) (IHO standards), available at
http://www.iho.shom.fr;
Guidelines of Good Practice for Hydrographic Surveys in New Zealand Ports and
Harbours (Wellington: Maritime Safety Authority of New Zealand, 2004), available at
http://www.msa.govt.nz.
job specifications;
equipment manufacturer’s instructions.
2
Definition
Maritime practice refers to documented practices and procedures that meet the
standards of Maritime New Zealand and the International Maritime Organisation.
Elements and performance criteria
Element 1
Prepare equipment for tidal stream and current measurement.
Performance criteria
1.1
Equipment is prepared in accordance with selected tidal stream measurement
method.
Range
tidal stream measurement methods include, but are not limited to
– tethered logship, free floating logship, pole, direct reading
current meter.
1.2
Automated recording equipment is prepared in accordance with manufacturer's
instructions.
1.3
Mooring is prepared to meet anticipated environmental conditions in
accordance with maritime practice.
Element 2
Deploy and recover tidal stream and current recording equipment.
Performance criteria
2.1
Equipment is deployed to withstand anticipated environmental conditions in
accordance with maritime practice and manufacturer’s instructions.
2.2
Equipment is deployed to enable measurement of the tidal stream or current in
accordance with job specifications and to facilitate recovery.
2.3
Equipment is recovered without damage to equipment, site, and environment.
 New Zealand Qualifications Authority 2016
11136 version 5
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Element 3
Demonstrate knowledge of tidal stream and current measurement and methods.
Performance criteria
3.1
Tidal stream measurement is described in terms of current and tide.
3.2
Tidal stream measurement is defined in terms of rectilinear and rotary tidal
streams and related elements.
3.3
Tidal stream measurement methods are described in terms of the application of
each method, procedures employed, and recording requirements for each
method.
Range
3.4
methods – tethered logship, free floating logship, direct reading
current meter (including Doppler).
The limitations and principal errors of each method are described in terms of its
ability to meet job specifications.
Range
methods – tethered logship, free floating logship, direct reading
current meter (including Doppler).
Element 4
Conduct a tidal stream measurement.
Performance criteria
4.1
Tidal stream direction and rate are obtained within the tolerances of the method
used.
Element 5
Analyse and present tidal stream and current data.
Performance criteria
5.1
Current and tidal stream directions and rate are derived, analysed, and
presented in accordance with HYSPEC.
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11136 version 5
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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 Infrastructure ITO askus@infratrain.co.nz if you wish to suggest changes to
the content of this unit standard.
 New Zealand Qualifications Authority 2016