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Elements and Performance Criteria

1. Determine design requirements
   • Determine water transfer, recharge, reuse and harvesting system needs
   • Describe processes of collecting, disposing and storing drainage water to avoid degrading water quality
   • Investigate regional geology and geography to predict drainage parameters
   • Apply hydrological calculations to predict volumes and rates of surface run-off
   • Conduct site investigations to assess depth of clay, depth of ground water, soil and water salinity, and structural or chemical impediments so as to determine the most cost effective drainage system
   • Document predictions of leaching fractions and salt movements, and develop soil amelioration and drainage management plans
   • Determine the need for leachate interception and dewatering system and if required prepare construction specification for interception and collection, disposal, reuse or recycle
   • Confirm drains and structures are capable of carrying the design water volumes and intensities according to enterprise standards
   • Identify construction specifications required to make drainage systems in accordance with environmental and work health and safety requirements
   • Identify and protect environmentally sensitive areas according to local, state and federal legislation and regulations
2. Design a drainage system
   • Select systems, including relevant equipment, to move water efficiently to water storage or treatment and at the flow and pressure required in design specifications
   • Select system combinations that are efficient, reliable, functional, serviceable and flexible for the intended application
   • Determine energy requirements and check layout of electricity lines with local authority if electrical pumps and motors are used in the system
   • Select structures, pipes, valves and accessories and integrate into a functional system that can be monitored and maintained
   • Define the work required to make suitable drainage systems available to the enterprise in the design specifications
   • Confirm power supply design specification with power authorities if electrical pumps and motors are used in the system
   • Minimise damage from drainage system issues
   • Design output is checked by an appropriately experienced and qualified person
3. Determine capital expense budget
   • Estimate materials required from plans and specifications
   • Estimate labour requirements based on documented work schedule with reasonable allowance for variances in work schedules
   • Base costing for each component on quoted information from suppliers, or sound analysis of individual elements
   • Document design calculations, performance indicators and decisions and relevant information in plans, specifications and manuals
   • Budget output is checked by an appropriately experienced and qualified person
4. Determine operating expense budget
   • Optimise the relationship between capital and operational costs including a comparison of energy sources
   • Collate all operating expense applicable to the completed drainage system and calculate an operating expense budget

Range Statement

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Performance Evidence

The candidate must be assessed on their ability to integrate and apply the performance requirements of this unit in a workplace setting. Performance must be demonstrated consistently over time and in a suitable range of contexts.

The candidate must provide evidence that they can:

assess the requirements for pumping capacity in a drainage system and power requirements

complete hydrological calculations

develop budgets

develop specifications for water transfer, recharge, reuse and harvesting systems

identify adverse environmental impacts of drainage and appropriate remedial action

identify design requirements

identify performance indicators for the drainage system

predict volumes and rates of surface run-off and system leakage

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Knowledge Evidence

The candidate must demonstrate knowledge of:

principles and practices of drainage design

budgeting, contractual development and obligations

developments in drainage technology

cost/benefit analysis

leachate interception and dewatering systems

leaching fractions and salt movements prediction

monitoring systems

the design processes

water transfer, recharge, reuse and harvesting systems

workplace health and safety and environmental protection legislation

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