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.

Required skills

communication skills to:

enable clear and direct communication, using questioning to identify and confirm requirements, share information, listen and understand

use language and concepts appropriate to cultural differences

use and interpret non-verbal communication, such as hand signals

initiative and enterprise skills to:

develop creative and responsive approaches

identify and accurately report to appropriate personnel any faults in tools, equipment or materials

literacy skills to read and interpret:

charts and hand drawings

job drawings

manufacturer specifications and instructions

material safety data sheets

memos

organisational work specifications

regulatory requirements

requirements and instructions issued by authorised organisational or external personnel

signage

numeracy skills to apply measurements and calculations

planning and organising skills to:

research, collect, organise and understand information relating to the design of complex stormwater and roof drainage systems

take initiative and make decisions

problem-solving skills to analyse requirements, consider options and design an appropriate system

technical skills to:

apply design concepts and principles

communicate graphical representations and plans

technology skills to:

access and understand site-specific instructions in a variety of media

use mobile communication technology

Required knowledge

relevant Australian standards and codes, including:

Australian rainfall and run-off document

AS/NZS3500 National plumbing and drainage

manufacturer specifications

National Construction Code

other relevant codes or standard operating procedures relevant to the sector

terminology and definitions used in hydraulic design

installation methods used in hydraulic systems

hazards associated with devices and systems used in the hydraulic sector

environmental requirements, including:

clean-up protection

stormwater protection

waste management

water quality management

quality assurance requirements, including:

EPA

internal company quality assurance policy and risk management strategies

International Standards Organisation

site safety plan

workplace operations and procedures

regulatory and legislative requirements, particularly those pertaining to:

building codes

WHS and environmental requirements

plumbing regulations

safe work procedures relating to planning, sizing and documenting layout of pipework and fixtures

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.