Water Quality Description

Water Quality

1. Description

1. 
   Stormwater can be a major source of contaminants into water courses including nutrients, heavy metals and pathogens. Over recent years local governments have required the installation of water quality improvement devices in new developments. These typically include:
   

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  Trash racks
  
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  Gross pollutant traps (GPTs)
  
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  Constructed (artificial) wetlands
  
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  Gully Pit Baskets and Nets.
  

2. 
   The water quality assessment should be based on the requirements of:
   

• 
  State Government environmental protection policies
  
• 
  Engineering Development Standards prepared by the local government in which the base is located
  
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  Water Sensitive Urban Design (WSUD) Principles
  
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  Standard Clauses on Civil Engineering for Inclusion in Functional Design Briefs, Department of Defence (http://www.defence.gov.au/im/policy/technical/standard_inclusions/civil_feb06.doc)
  
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  Environment Protection and Biodiversity Conservation (EPBC) Act
  
• 
  ANZECC: Australia and New Zealand Environment and Conservation Council, Australian and New Zealand Guidelines for Fresh and Marine Water Quality, October 2000.
  

1. Data Collection

3. 
   The stormwater system data collection questionnaire (Appendix E) includes specific questions relating to the stormwater network. Data collection forms (Appendix D) also include prompts for specific data requirements that are needed to undertake the assessment.
   
4. 
   Data required for water quality assessments includes details of any water quality improvement devices including type, flow, function, age, by-pass facilities, manufacturer, model, dimensions, design capacities, maintenance practices. Other data will include water quality management plans, reports/ studies into stormwater quality and receiving waters, monitoring results, maintenance records
   

1. Capacity Assessment

5. 
   The capacity will assessment will include:
   

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  Assessing the performance of existing water quality improvement devices based on any monitoring data
  
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  Comparing actual loading against the design or rated capacity.
  

6. 
   The capacity assessment is only relevant to installed water quality treatment devices. If no devices are installed (i.e. direct outflow), then the capacity assessment is not relevant.
   

1. Condition Assessment

14. 
    Water quality improvement devices are graded on a scale of 1 to 5, with 1 representing ‘As new’ condition and 5 representing an ‘unserviceable’ condition as outlined in Error: Reference source not foundTable 1.1 (structural) and Table 1.2 (serviceability).
    

1. 
   Structural condition - water quality improvement devices
   

1. 
   Serviceability condition – water quality improvement devices
   

7. 
   The condition assessment is only relevant to installed water quality treatment devices. If no devices are installed (i.e. direct outflow), then the condition assessment is not relevant.
   

1. 
   
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