Base Engineering Assessment Program Stormwater Systems



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Compliance Assessment


  1. The following criteria are used to assess compliance of the water quality improvement devices:

  • State Government environmental protection policies

  • Engineering Development Standards prepared by the local government in which the base is located

  • Water Sensitive Urban Design (WSUD) Principles

  • ANZECC: Australia and New Zealand Environment and Conservation Council, Australian and New Zealand Guidelines for Fresh and Marine Water Quality, October 2000.

  1. The level of compliance will take into account:

  • Whether any base development has occurred in recent years which should have been subject to contemporary water quality management practices. Existing base arrangements are deemed to be compliant until any new developments are proposed

  • Capacities and loadings of existing water quality improvement devices

  • The level of maintenance on existing devices

  • Any specific requirements placed on the base by the state environmental regulator or local government.

  1. Compliance with the Defence precinct’s stormwater quality management plan should be assessed. Where water quality results are available for outlets, the water quality reading should be compared to the relevant ANZECC guideline limits, based on the classification of the area where the water is discharged (i.e. local creek, RAMSAR wetland , etc.).

Stormwater Systems




  1. Stormwater Data Required Checklists




Sub-service

Capacity

Condition

Compliance

Category

Required Data

Data title

DSR Number

All

Y

Y

Y

Spatial Data

Ground levels and topography e.g. LIDAR

 

 

All

Y

Y

Y

Base Development History

History of base development, including changes since commissioning

 

 

All

Y

Y

Y

Spatial Data

GIS, CAD design plans, site survey, as-constructed drawings and equipment databases

 

 

Network

Y

 

Y

Analysis Data

Hydraulic Model: Data Input (GIS) including network details, elevations and demand nodes, and Modelling Outputs (pipe flood depths)

 

 

Network

Y

Y

Y

Analysis Data

Records of network collapses or flooding

 

 

Network

Y

 

Y

Analysis Data

Network Design Capacity

 

 

Network

 

Y

Y

Analysis Data

Pipeline condition reports or inspection data e.g. CCTV

 

 

Network

 

Y

Y

Analysis Data

Pit condition reports or inspection data

 

 

Network

 

Y

Y

Operations and Maintenance

Operations and maintenance data / maintenance records

 

 

Network

Y

Y

Y

Operations and Maintenance

Previous operational issues (flooding incidents, blockages, collapses, etc.)

 

 

Network

 

Y

Y

Operations and Maintenance

Operations and Maintenance (O&M) Manuals

 

 

Network

Y

Y

Y

Spatial Data

Survey data including horizontal and vertical alignment, surface levels, depths, invert levels and location

 

 

Network

Y

Y

Y

Spatial Data

Pipelines - diameter, material, age

 

 

Network

Y

 

 

Analysis Data

Catchment and sub-catchment areas

 

 

Overland flow

Y

Y

Y

Spatial Data

Details of any detention basins, pond, tanks, weirs, discharge structures and outlet points

 

 

Overland flow

Y

 

 

Analysis Data

Existing model data or flood report data

 

 

Overland flow

 

Y

 

Analysis Data

Condition reports/details for overland flow paths or physical inspection details of overland flow paths and channels

 

 

Overland flow

Y

 

 

Analysis Data

Hydraulic Model: Data Input (GIS) including network details, elevations, catchment/sub-catchment data, and Modelling Outputs (10, 20 and 100 year ARI) as well as other specific local authority events.

 

 

Overland flow

 

 

Y

Safety and Access

Flood hazard risk assessment

 

 

Overland flow

Y

Y

 

Operations and Maintenance

Flooding incidents

 

 

Water quality

Y

 

Y

Analysis Data

Previous design reports for flood immunity (overland flow discharge) or network capacity (piped discharge)

 

 

Water quality

Y

 

Y

Analysis Data

Water quality management plan

 

 

Water quality

Y

 

Y

Analysis Data

Discharge water quality and quantity into potential sensitive environments

 

 

Water quality

 

 

Y

Environment

Reports on water contamination / environmental issues on base

 

 

Water quality

 

 

Y

Environment

Potential points of contamination, isolated or protected

 

 

Water quality

 

Y

Y

Operations and Maintenance

Maintenance records - Water quality management devices

 

 

Water quality

Y

 

 

Spatial Data

Water quality management devices - Details including type, flow, function, age, bypass arrangements

 

 

Water quality

Y

 

 

Spatial Data

Mechanical equipment (i.e. treatment equipment, GPTs, stormceptors, etc.) – Manufacturer, model, age, operating curves, motor size, control philosophy

 

 

Stormwater Systems


  1. Stormwater Master Spreadsheet – Refer Electronic File

Stormwater Systems


  1. STANDARD ASSET LIFE – STORMWATER ASSETS


Infrastructure component

Useful Life Range (yrs)

Typical Life (yrs)

Stormwater Network

Pipes – Concrete

60 - 100

90

Pipes – PVC

60 - 80

70

Pipes – Polyethylene

60 - 80

70

Pipes – Vitreous clay

80 - 100

90

Pipes – corrugated steel

40 - 70

60

Open drains – lined

60 – 100

90

Open drains – unlined

80 – 150

120

Culverts – corrugated steel

40 - 70

60

Pits – concrete

60 - 100

90

Headwall/ Endwall (outlet)

60 - 100

90

Stormwater Systems




  1. Stormwater Data Collection Forms – Refer Separate Electronic Files

Stormwater Systems


  1. Stormwater system QUESTIONNAIRE

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