Unit of competency Outline

Date retreived
22/07/2026 4:26 AM AWST

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Design drainage systems

Design drainage systems

Unit of competency
National Code
AHCDRG502
State Code
OBK06
TGA Status
Current
DTWD Status
Approved
Current Release Number
1.00
Current Release Date
21/10/2019
View on TGA
State Implementation and Classification
Approved Date
28/01/2020
Field of Education
030907 - Water And Sanitary Engineering
Original Release Date
28/01/2020
Nominal Hours
50
Description
This unit of competency describes the skills and knowledge required to identify design requirements, determine specifications, capital expense and operating expense budgets and design the drainage system.The unit applies to individuals who apply specialised skills and knowledge to the design of drainage systems, and take personal responsibility and exercise autonomy in undertaking complex work. They analyse and synthesise information and analyse, design and communicate solutions to sometimes complex problems.No licensing, legislative or certification requirements apply to this unit at the time of publication.
Notes
Elements and Performance Criteria
1. Determine design requirements
  • 1.1 Determine water transfer, recharge, reuse and harvesting system needs
  • 1.2 Identify processes of collecting, disposing and storing drainage water to avoid degrading water quality
  • 1.3 Investigate regional geology and geography to predict drainage parameters
  • 1.4 Apply hydrological calculations to predict volumes and rates of surface run-off
  • 1.5 Conduct site investigations to assess depth of clay, depth of ground water, soil and water salinity, and structural or chemical impediments
  • 1.6 Determine the most cost effective drainage system
  • 1.7 Document predictions of leaching fractions and salt movements, and develop soil amelioration and drainage management plans
  • 1.8 Determine the need for leachate interception and dewatering system and if required prepare construction specification for interception and collection, disposal, reuse or recycle
  • 1.9 Confirm drains and structures are capable of carrying the design water volumes and intensities according to workplace standards
  • 1.10 Identify construction specifications required to make drainage systems according to environmental and workplace health and safety requirements
  • 1.11 Identify and protect environmentally sensitive areas according to local, state and federal legislation and regulations
2. Design a drainage system
  • 2.1 Select systems, including relevant equipment, to move water efficiently to water storage or treatment and at the flow and pressure required in design specifications
  • 2.2 Select system combinations that are efficient, reliable, functional, serviceable and flexible for the intended application
  • 2.3 Determine energy requirements and check layout of electricity lines with local authority if electrical pumps and motors are used in the system
  • 2.4 Select and integrate structures, pipes, valves and accessories into a functional system that can be monitored and maintained
  • 2.5 Define the work required to make suitable drainage systems available to the workplace in the design specifications
  • 2.6 Confirm power supply design specification with power authorities if electrical pumps and motors are used in the system
  • 2.7 Minimise drainage system design damage based on current industry practice
  • 2.8 Document drainage system design based on current industry practice
  • 2.9 Confirm design output with an appropriately experienced and qualified person
3. Determine capital expense budget
  • 3.1 Estimate materials required from plans and specifications
  • 3.2 Estimate labour requirements based on documented work schedule with reasonable allowance for variances in work schedules
  • 3.3 Base costing for each component on quoted information from suppliers, or sound analysis of individual elements
  • 3.4 Document design calculations, performance indicators and decisions and relevant information in plans, specifications and manuals
  • 3.5 Document capital expense budget based on current industry practice
  • 3.6 Confirm capital expense budget output with an appropriately experienced and qualified person
4. Determine operating expense budget
  • 4.1 Optimise the relationship between capital and operational costs including a comparison of energy sources
  • 4.2 Collate all operating expense applicable to the completed drainage system and calculate an operating expense budget
  • 4.3 Document operating expense budget based on current industry practice
No information
No information
Replaces
State Code National Code Title Type
BAT31 AHCDRG501 Design drainage systems Unit of competency