geelong modelling program and future upgrades mircea stancu 25 june 2010
TRANSCRIPT
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GEELONG MODELLING PROGRAMAND FUTURE UPGRADES
Mircea Stancu 25 June 2010
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BARWON WATER
Regional Water Corporation
South west of Melbourne
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GEELONG DISTRICT SEWER CATCHMENT
Geelong
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GEELONG DISTRICT SEWER CATCHMENT
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GEELONG DISTRICT SEWER CATCHMENT
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GEELONG DISTRICT SEWER CATCHMENT
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POPULATION GROWTH PREDICTION
GREATER GEELONG AREA2045 PREDICTION
New residents: between 88,000 and 142,000
Total ADWFs will increase by between 75ML/day and 100ML/day (over 50% increase)
Increase in ADWF to Black Rock WRP between 69ML/day and 92ML/day (over 50% increase)
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GEELONG DISTRICT SEWER CATCHMENT
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GEELONG TRUNK NETWORK
Trunk network in Geelong
- Relatively isolated from northern flows
- Relying on two main sewers
- Very difficult to upgrade (going through Geelong CBD
- High impact in case of failure
- Future servicing strategy relying on smart use of interconnections and current capacity.
Flow Retarding Facility
New WRP
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GEELONG TRUNK NETWORK
How it works
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CURRENT PRACTICE
Current Status Quo
- Extensive use of WSAA code recommendations for smaller divisions- A current MIKE11/MOUSE trunk sewer model mainly used by
consultants- No in-house expertise on model/software package
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MONITORING PROGRAM
Location of monitors
Monitoring for:- Level- Flow- EC- Rainfall
Monitoring Program:- Early phase of
implementation- May be enhanced by
temporary monitoring- 3 years long - Main scope is to provide
reliable data for the modelling project
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MODELLING PROGRAM SCOPE
MAIN SCOPE- Prove 1 in 5 years compliance- Providing better network behavior understanding- Providing critical information for new Capital Works Expenditure- Providing option analysis tools (best value for money)- Providing information for maintenance purposes (high infiltration areas,
diversion flows, etc.)
ADDITIONAL SCOPE- Confirmation of sewer return ratios- Information regarding effects of water restriction on sewer flows- Confirmation of impact of repairs (e.g. sewer re-lining, de-silting) and
replacements- Better prediction of the impact of new developments- Flow profiles and their impact on sewer mining options- Impact of sewer mining on network- Infiltration level information (including saltwater infiltration)- Horizontal integration with BW’s GIS system
Will attempt to solve main issues we are facing such as:
- How much spare capacity we still have in the pipes
- How the interconnections will work and how the network will respond
- How the new WRP to the north of Geelong will influence the network behavior
- When we will need to upgrade the transport pipe from Geelong to Black Rock
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MODELLING RESOURCING AND DELIVERY OPTIONS
Current ideas:DEVELOPMENT: Externally developed, internally maintained
- Provides best combination of risk mitigation and value for expenditure
MODEL TYPE:Detailed network
- Longer setup time of geographical network however far easier to set up parameters and loadings
- Corrected GIS data can be fed back into the GIS system- Less error prone to options analysis and inclusion of new developments
and demands (no bulk catchments)- Provide a good platform for the modelling of other smaller areas for
various purposes (infiltration modelling, sewer mining, flows diversions etc.)
- Easy to improve in the future
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MODELLING RESOURCING AND DELIVERY OPTIONS
SUMMARY:
My recommendation is for the model to be:- Detailed network- Externally generated- Internally maintained
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MODELLING PROJECT IMPLEMENTATION STEPS
1. Ensure stakeholders agreement and corporate support: Aug-Sept
2. Ask for capabilities statement and/or presentations from major software developers (i.e. write software requirements brief): Sept-Oct
3. Choose software package: Oct-Nov
4. Write consultants brief: Nov
5. Tender process: Nov-Dec
6. Project delivery: Early 2011 with yearly calibrations
7. Maintenance and training: 2011 onwards
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MODELLING PROJECT IMPLEMENTATION STEPS
Discussion
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MAIN OUTFALL SEWER DUPLICATION
Main Outfall Sewer as a part of the overall network:
MAIN OUTFALL SEWER DUPLICATION
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GEELONG DISTRICT SEWER CATCHMENT
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MAIN OUTFALL SEWER
Characteristics:
- 10.5 km long
- 1650mm dia
- Strategic asset
- Very shallow slope (1 in 3000)
- Over 30 years old but in acceptable condition
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MAIN OUTFALL SEWER AND ITS DUPLICATION
MAIN OUTFALL SEWER
- Close to reaching capacity in wet weather
- We know it will need to be upgraded
- The modelling program will provide better estimates of future flows and upgrade timelines
- Running through major future development hence route needs to be decided before development occurs
- Current capacity: 2000L/s
- Predicted needed capacity (PWWF): 3600L/s
- Will continue to transport all DWFs
Development Boundary
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AUGMENTATION OPTIONS
Development Boundary
Same route has been decided
Three options:
1. Identical duplication (1650dia @ 1 in 3000 grade). Price: ~80 mil.
2. Rising main (1100mm dia). Price: ~40 mil.
3. Pressure gravity sewer (1100mm dia @ 1 in 3000). Can be pressurized. Price: ~60mil.
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DIFFERENCE IN PUMPED FLOW VOLUMES
Option 2: Rising main Option 3: Pressure Gravity Sewer
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WINNING OPTION
NUMBER 3: Pressure gravity sewer
It provides significant advantages and very high flexibility, for a smaller price compared to an exact duplication.
• Questions?