11135 version 5
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Establish and monitor a tidal station
Level
4
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: identify site and
equipment requirements for establishing a tidal station; position and establish
benchmarks for hydrographic surveying purposes; connect benchmarks to a
tide pole; install and calibrate tide measuring equipment; complete tidal
station documentation; and monitor tidal station equipment.
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
11135 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;
Specifications for Geodetic Hydrographic Control Points v1.1 (Wellington: Land
Information New Zealand (LINZ), 2006), available at http://www.linz.govt.nz;
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.
Elements and performance criteria
Element 1
Identify site and equipment requirements for establishing a tidal station.
Range
evidence is required from a tidal station site that includes a wharf and open
beach.
Performance criteria
1.1
The site selected is exposed to the full range of tides.
1.2
Equipment requirements are determined in accordance with the demands of the
site.
Element 2
Position and establish benchmarks for hydrographic surveying purposes.
Range
at least three benchmarks for one tidal station;
evidence is required of – positioning at least one benchmark, establishing at
least one benchmark.
Performance criteria
2.1
Benchmarks are securely established and/or positioned to ensure stability of the
reference level in accordance with HYSPEC.
2.2
Benchmarks are sited to facilitate levelling to the pole site in accordance with
HYSPEC.
2.3
Benchmarks are positioned in relation to a geodetic reference frame in
accordance with HYSPEC, and LINZ specifications for geodetic hydrographic
control points.
 New Zealand Qualifications Authority 2016
11135 version 5
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Element 3
Connect benchmarks to a tide pole.
Range
at least three benchmarks for one tidal station.
Performance criteria
3.1
Sounding datum is connected to benchmarks by levelling in accordance with
HYSPEC, and LINZ specifications for geodetic hydrographic control points.
Element 4
Install and calibrate tide measuring equipment.
Performance criteria
4.1
The tide gauge is installed to enable continuous tidal measurement in
accordance with HYSPEC.
4.2
The tide pole is erected to permit accurate reading, and to enable connection to
benchmarks and the calibration of the gauge, in accordance with HYSPEC.
4.3
Comparative data is gathered to enable the pole gauge relationship to be
determined in accordance with HYSPEC.
4.4
The calibration curve is calculated and plotted to enable an actual tidal cycle to
be produced from gauge records and achieve HYSPEC standards.
Element 5
Complete tidal station documentation.
Range
at least one report.
Performance criteria
5.1
Tidal station documentation is completed in accordance with HYSPEC.
Range
documentation – photographs, vertical reference datum, site
diagram, levelling documentation, station chronology, tidal heights,
textual description, benchmark descriptions.
 New Zealand Qualifications Authority 2016
11135 version 5
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Element 6
Monitor tidal station equipment.
Range
evidence is required from at least six visits to a tidal station.
Performance criteria
6.1
Data are recorded from tide measuring equipment within the limits of instrument
accuracy.
Range
data – date, time, time zone, tide gauge, benchmark, reference
level.
6.2
Comparative readings are undertaken to confirm the stability and validity of tide
gauge readings in accordance with HYSPEC.
6.3
Environmental conditions which affect tidal height accuracy are recorded during
site visits in accordance with HYSPEC.
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