Elements and Performance Criteria

The range statement relates to the unit of competency as a whole. It allows for different work environments and situations that may affect performance. Bold italicised wording, if used in the performance criteria, is detailed below. Essential operating conditions that may be present with training and assessment (depending on the work situation, needs of the candidate, accessibility of the item, and local industry and regional contexts) may also be included.
Client requirements may include:
architectural plans
briefs
site conditions
statutory bodies
standards and codes
specifications.

Local government, Environment Protection Authority, and relevant Australian standards and code requirements may include:
local government requirements, including:
Australian rainfall and run-off documentation
Integrated Planning Act (IPA)
other regulatory requirements
standard drawings and details
town planning requirements
urban design manuals
treatment requirements, such as:
screens
silt traps
solid removal systems
environmental requirements to cover water quality management, including:
clean-up protection
stormwater protection
waste management
Australian standards and codes, including:
National Construction Code
AS/NZS3500 National plumbing and drainage.

Other documentation relevant to the design must include plans, drawings, manuals and reports regarding:
buildings
catchment area analysis
civil drawings
contour levels
existing services
manufacturer requirements and specifications
reduced levels
site plans
stormwater design
surveys.

System components may include:
access chambers (manholes)
channels
culverts
downpipes
fire rating of penetrations
grated pits
gullies
guttering
inspection chambers
inspection openings
kerbs
piping
pits.

Treatment and disposal options for stormwater discharge may include:
treatment options:
grass and rock swales
lagoons
momentum diffusers
ponds
screens
silt traps
traps
other solid removal systems as determined
disposal options:
connection to stormwater mains
creeks
harbour
kerb and street channels
lakes
on-site harvesting and reuse
rainwater collection systems, including tanks and dams
rivers
streams.

Rainfall intensities are determined by:
average rainfall intervals
roof, surface and subsurface calculations
site location
time and concentration.

Catchment areas must include:
land surface catchment areas, including a variety of surface conditions such as grassed and paved areas
roof catchment areas.

Stormwater drainage systems may include:
access chambers (manholes)
collection sumps
detention and retention
grade of drains
harvesting
holding pits
pump discharge.

Approved materials may include:
piping materials:
concrete
earthenware or vitrified clay pipe (VCP)
fibre cement (FRC)
polyvinyl chloride (PVC)
other approved materials
fittings:
bends
grates
gullies
junctions
non-return valves.

Stormwater systems requiring pumping must include:
holding tanks
overflow provisions
pump and controls
rising main.

Sustainability principles and concepts:
cover the current and future social, economic and environmental use of resources
may include:
selecting appropriate material to ensure minimal environmental impact
harvesting and reuse
efficient use of material
efficient energy usage/capital outlay comparison
effect on the environment due to overflow or leakage
consideration of the Green Building Council of Australia rating scheme.

Plans:
may include:
cross-sections
details
elevations
sections
site
may be produced using:
computer generation
drawing equipment.

Specification and user manuals may include:
commissioning
bedding
support
concrete support and detailing specialised components
jointing
access chambers (manholes)
manufacturer requirements
materials
pumps
safety (WHS)
testing
workmanship.

The evidence guide provides advice on assessment and must be read in conjunction with the performance criteria, required skills and knowledge, range statement and the Assessment Guidelines for the Training Package.
Overview of assessment
This unit of competency could be assessed in the workplace or a close simulation of the workplace environment providing that simulated or project-based assessment techniques fully replicate plumbing and services workplace conditions, materials, activities, responsibilities and procedures.
It may be assessed on its own or as part of an integrated assessment activity involving production of designs, plans, specifications and supporting documentation for a complex stormwater and roof drainage system.

Critical aspects for assessment and evidence required to demonstrate competency in this unit
A person who demonstrates competency in this unit must be able to provide evidence of the ability to:
design, size and document the layout details, including a specification, of a stormwater system for a site incorporating a high rise mixed development building and a wide span project, such as a school
evaluate and document design parameters, including client, regulatory, manufacturer and relevant Australian standards and code requirements for a stormwater system
evaluate health risks associated with the stormwater system
collect, analyse and evaluate research, including:
catchment area
survey plans
existing services
building plans
site plans
civil drawings
reduced levels
contour levels
prepare a plan coordinated with other services for the layout of piping, pits, gullies and other system components according to design parameters and site limitations
calculate stormwater detention, retention and harvesting systems
calculate roof catchment areas and surface run-off volumes
determine specifications for guttering requirements and size of downpipes
design sub-soil drainage systems, including sizing for collection, containment and discharge
create detail drawings, including long sections and cross-sections
create a design, including size and detail for complex stormwater and roof drainage systems, including:
access chambers (manholes)
grade of drains
holding pits
collection sumps
detention, retention and harvesting systems
other system components
apply appropriate software in order to design, size and detail selected stormwater systems
prepare plans for a range of complex stormwater and roof drainage systems
prepare a specification for a complex stormwater and roof drainage system
prepare a testing and commissioning schedule
prepare an operation and maintenance manual
apply sustainability principles and concepts throughout to achieve a star rating under the Green Building Council of Australia rating scheme.

Context of and specific resources for assessment
This competency is to be assessed using standard and authorised work practices, safety requirements and environmental constraints.
Assessment of essential underpinning knowledge will usually be conducted in an off-site context.
Assessment is to comply with relevant regulatory or Australian standards' requirements.
Resource implications for assessment include:
an induction procedure and requirement
realistic tasks or simulated tasks covering the minimum task requirements
relevant specifications and work instructions
tools and equipment appropriate to applying safe work practices
support materials appropriate to activity
workplace instructions relating to safe work practices and addressing hazards and emergencies
material safety data sheets
research resources, including industry-related systems information.
Reasonable adjustments for people with disabilities must be made to assessment processes where required. This could include access to modified equipment and other physical resources, and the provision of appropriate assessment support.

Method of assessment
Assessment methods must:
satisfy the endorsed Assessment Guidelines of the Construction, Plumbing and Services Training Package
include direct observation of tasks in real or simulated work conditions, with questioning to confirm the ability to consistently identify and correctly interpret the essential underpinning knowledge required for practical application
reinforce the integration of employability skills with workplace tasks and job roles
confirm that competency is verified and able to be transferred to other circumstances and environments.
Validity and sufficiency of evidence requires that:
competency will need to be demonstrated over a period of time reflecting the scope of the role and the practical requirements of the workplace
where the assessment is part of a structured learning experience the evidence collected must relate to a number of performances assessed at different points in time and separated by further learning and practice, with a decision on competency only taken at the point when the assessor has complete confidence in the person's demonstrated ability and applied knowledge
all assessment that is part of a structured learning experience must include a combination of direct, indirect and supplementary evidence.
Assessment processes and techniques should as far as is practical take into account the language, literacy and numeracy capacity of the candidate in relation to the competency being assessed.
Supplementary evidence of competency may be obtained from relevant authenticated documentation from third parties, such as existing supervisors, team leaders or specialist training staff.