CPCPCM5002B
Design complex stormwater and roof drainage systems

This unit of competency specifies the outcomes required to design complex stormwater and roof drainage systems for commercial, industrial and residential properties.

Application

This unit of competency supports the needs of experienced plumbers specialising in hydraulics.


Prerequisites

Nil


Elements and Performance Criteria

ELEMENT

PERFORMANCE CRITERIA

1. Evaluate design parameters.

1.1. Client requirements are determined from plans, specifications and client briefs.

1.2. Local government, Environment Protection Authority (EPA), and Australian and New Zealand standards for the design of complex stormwater and roof drainage systems are interpreted.

1.3. Regulatory requirements for design of complex stormwater and roof drainage systems are analysed and applied.

1.4. Other documentation relevant to the design is researched, evaluated and applied.

2. Plan system components.

2.1. Layout of system components is planned according to design parameters and site limitations, and is coordinated with other services.

2.2. Stormwater diversion valve systems and first-flush stormwater systems are planned and evaluated.

2.3. Most suitable methods of preventing backflow of sub-soil and stormwater into buildings are determined and specified.

2.4. Treatment and disposal options for stormwater discharge are evaluated and planned.

3. Design and size systems.

3.1. Rainfall intensities are determined and volumes of water are estimated using measurements of different catchment areas.

3.2. Methods of collection and disposal of surface run-off water are specified.

3.3. Strategies for harvesting and re-using rainwater are identified and evaluated.

3.4. Sub-soil water types are determined and stormwater drainage systems are designed, sized and detailed using appropriate software applications.

3.5. System components are selected, designed, sized and detailed using appropriate software applications and appropriate approved materials are analysed and selected.

3.6. Stormwater systems requiring pumping are identified and designed using appropriate software applications, with pump and discharge pipe sizes calculated and specified.

3.7. Correct installation, laying and jointing procedures for materials and components are specified.

4. Prepare documentation.

4.1. Plans are prepared for a range of complex stormwater and roof drainage systems.

4.2. Specification for a complex stormwater and roof drainage system is prepared.

4.3. Testing and commissioning schedule is prepared.

4.4. Operation and maintenance manual is produced.

Required Skills

Required skills

Required skills for this unit are:

ability to apply design concepts and principles

communication of graphical representations and plans

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

innovation skills to develop creative and responsive approaches

identifying and accurately reporting to appropriate personnel any faults in tools, equipment or materials

numeracy skills to apply measurements and calculations

planning and organisational 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

reading and interpretation skills to 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

work bulletins

work schedules and plans

technological skills to:

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

use mobile communication technology.

Required knowledge

Required knowledge for this unit is:

relevant Australian and New Zealand standards, including:

AS/NZS3500 National plumbing and drainage set

Building Code of Australia

manufacturer specifications

other applicable 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

OHS and environmental requirements

plumbing regulations

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

Evidence Required

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:

collecting, analysing and evaluating research, including:

survey plans

existing services

building plans

site plans

civil drawings

reduced levels

contour levels

preparing a plan coordinated with other services for the layout of piping, pits, gullies and other system components in accordance with design parameters and site limitations

calculating stormwater detention basins' sizes and capacities

calculating roof catchment areas and surface run-off volumes

determining specifications for guttering requirements and size of downpipes

designing sub-soil drainage systems, including sizing for collection, containment and discharge

creating detail drawings, including long sections and cross-sections

creating a design, including size and detail for complex stormwater and roof drainage systems, including:

grade of drains

holding pits

collection sumps

detention basins

manholes

other system components

applying appropriate software in order to design, size and detail selected stormwater systems

preparing plans for a range of complex stormwater and roof drainage systems

preparing a specification for a complex stormwater and roof drainage system

preparing a testing and commissioning schedule

preparing an operation and maintenance manual.

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 working 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.


Range Statement

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.

Clients may include:

architects

builders

property owners

statutory bodies.

Local government, Environment Protection Authority, and Australian and New Zealand standards requirements cover:

local government requirements, including:

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 and New Zealand standards, including:

AS/NZS3500 National plumbing and drainage set:

Part 3.1 Stormwater drainage - performance criteria

Part 3.2 Stormwater drainage - acceptable solutions

AS2200 Design charts for water supply and sewerage.

Other documentation relevant to the design includes plans, drawings, manuals and reports regarding:

buildings

civil drawings

contour levels

existing services

manufacturer requirements and specifications

reduced levels

site plans

stormwater design

surveys.

System components include:

access chambers

channels

culverts

downpipes

grated pits

gullies

guttering

inspection chambers

inspection openings

kerbs

manholes

piping

pits.

Treatment and disposal options for stormwater discharge 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

kerb and street channels

lakes

manholes

rainwater collection systems, including tanks and dams

rivers

streams.

Rainfall intensities are determined by:

average rainfall intervals

roof, surface and subsurface calculations

time and concentration.

Catchment areas include:

land surface catchment areas, including a variety of surface conditions such as grassed and paved areas

roof catchment areas.

Stormwater drainage systems include:

collection sumps

detention basins

grade of drains

holding pits

manholes.

Approved materials include:

piping materials:

concrete

earthenware

fibre cement (FRC)

polyvinyl chloride (PVC)

other composite materials

fittings:

bends

grates

gullies

junctions

non-return valves.

Stormwater systems requiring pumping include:

building basements

rising main installations

subsurface water drainage systems.

Plans include:

cross-sections

detail drawings

long sections.

Specification and user manuals include:

commissioning

components

fittings

installation

maintenance

materials

pumps

testing

valves.


Sectors

Unit sector

Plumbing and services


Co-Requisites

Nil


Employability Skills

This unit contains employability skills.


Licensing Information

Not Applicable