AMBERLEY WATER SUPPLY STRATEGY Lead Designer Stuart Sandy, AECOM - - PowerPoint PPT Presentation

AMBERLEY WATER SUPPLY STRATEGY

Lead Designer – Stuart Sandy, AECOM Presented by – Bryn Larsen, AECOM

MARCH 26, 2014

AMBERLEY WATER STRATEGY

PROJECT OVERVIEW

PROJECT DRIVERS

• Already close to restrictions being imposed at peak times
• Population growth and development
• Decline in water quality with regard to Iron content
• Over-reliance on the single source currently owned by

Amberley – lack of supply resilience

AMBERLEY WATER STRATEGY Page 3 April 7, 2014

WATER SOURCES

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1956 – Reticulation network and Domain source established 1966 – State Highway 1 source established 1972 – SH1 becomes primary source for Amberley 2009 - Domain source abandoned due to deepening of Kowai River bed Other current & potential sources

AMBERLEY RESERVOIR RACECOURSE ROAD SOURCE KOWAI RIVER ROAD SOURCE MAYS WELL SOURCE AMBERLEY DOMAIN SOURCE (ABANDONED) LEITHFIELD BEACH SOURCE LEITHFIELD AMBERLEY TOWNSHIP AMBERLEY BEACH STATE HIGHWAY 1 SOURCE

FORECAST WATER DEMAND (AMBERLEY)

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WATER AVAILABLE

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AMBERLEY WATER STRATEGY

PROPOSED OPTIONS

OPTION 1

• Ongoing operation

and maintenance costs

• Lack of investment

in the network will result in a failure to meet present and future needs as a statutory authority

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Do Nothing Approximate cost of network investment - $0

LEITHFIELD BEACH DEMAND 4.5 L/S LEITHFIELD BEACH SOURCE CURRENT 9 L/S CONSENT 30 L/S STATE HIGHWAY 1 SOURCE CURRENT 13.8 L/S CONSENT 20 L/S KOWAI RIVER ROAD SOURCE CURRENT 5.3 L/S CONSENT 15 L/S AMBERLEY BEACH DEMAND 2.4 L/S NORTHERN ASHLEY RURAL WATER LEITHFIELD TOWNSHIP EXISTING 150mm PVC RETICULATION AMBERLEY RESERVOIR CLUSTER CAPACITY 720 M3 AMBERLEY TOWNSHIP DEMAND 17.8 L/S MAYS WELL SOURCE BACKUP SUPPLY FROM RACECOURSE ROAD SOURCE

• MAX. 5.5 L/S

OPTION 2

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• 3600m of new

200mm water main

• Water mixing

facility

• New pumps at

Leithfield Beach and upgrade at Kowai

• New 5000m3

reservoir on Domain site

• Purchase of the

Kowai bore and 150mm PVC reticulation

Supply from Leithfield Beach, SH1 and Kowai including storage

Approximate cost - $3.57M + Kowai assets

LEITHFIELD BEACH DEMAND 4.5 L/S LEITHFIELD BEACH SOURCE PROPOSED 21 L/S CONSENT 30 L/S STATE HIGHWAY 1 SOURCE PROPOSED 13.8 L/S KOWAI RIVER ROAD SOURCE PROPOSED 5.3 L/S AMBERLEY BEACH DEMAND 2.4 L/S NORTHERN ASHLEY RURAL WATER LEITHFIELD TOWNSHIP NEW WATER MIXING FACILITY & PUMPING STATION AT KOWAI RIVER ROAD EXISTING 150mm PVC RETICULATION AMBERLEY RESERVOIR CLUSTER CAPACITY 720 M3 AMBERLEY TOWNSHIP DEMAND 17.8 L/S MAYS WELL SOURCE NEW 5000 M3 RESERVOIR ON DOMAIN SITE

OPTION 3

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Increased supply from SH1 and Kowai including treatment

Approximate cost - $800k + cost of Kowai assets

• 600m of new

150mm water main at Kowai River Road

• Purchase of

the Kowai bore and 150mm PVC reticulation

• New

treatment facility at Kowai River

• Pump

upgrade at Kowai River

BACKUP SUPPLY FROM RACECOURSE ROAD SOURCE

• MAX. 5.5 L/S

LEITHFIELD BEACH SOURCE CURRENT 9 L/S CONSENT 30 L/S STATE HIGHWAY 1 SOURCE CURRENT 13.8 L/S PROPOSED 20 L/S KOWAI RIVER ROAD SOURCE CURRENT 5.3 L/S PROPOSED 15 L/S AMBERLEY BEACH DEMAND 2.4 L/S NORTHERN ASHLEY RURAL WATER LEITHFIELD TOWNSHIP NEW TREATMENT FACILITY & PUMPING STATION AT KOWAI RIVER ROAD EXISTING 150mm PVC RETICULATION AMBERLEY RESERVOIR CLUSTER CAPACITY 720 M3 AMBERLEY TOWNSHIP DEMAND 17.8 L/S MAYS WELL SOURCE

OPTION 4

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Increased supply from SH1 and Kowai including treatment – Leithfield Beach supply for Ashley

Approximate cost - $1.2M

• New treatment

facility at Kowai River Road

• New 200mm

main from Kowai site to new connection

• n SH1 150mm

main.

• New 2000m x

200mm from Leithfield Beach to Leithfield Township

• New 800m x

150mm Old Main North Rd

• New 500m x

150mm Mays Rd

BACKUP SUPPLY FROM RACECOURSE ROAD SOURCE

• MAX. 5.5 L/S

LEITHFIELD BEACH SOURCE CURRENT 9 L/S PROPOSED 24 L/S CONSENT 30 L/S

STATE HIGHWAY 1 SOURCE CURRENT 13.8 L/S PROPOSED 20 L/S

KOWAI RIVER ROAD SOURCE CURRENT 5.3 L/S PROPOSED 15 L/S AMBERLEY BEACH DEMAND 2.4 L/S NORTHERN ASHLEY RURAL WATER LEITHFIELD TOWNSHIP NEW TREATMENT FACILITY & PUMPING STATION AT KOWAI RIVER ROAD EXISTING 150mm PVC RETICULATION AMBERLEY RESERVOIR CLUSTER CAPACITY 720 M3 AMBERLEY TOWNSHIP DEMAND 17.8 L/S NEW 200mm WATER MAIN PROVIDING 15 L/S TO ASHLEY WATER SCHEME MAYS WELL SOURCE

CONCLUSIONS OPTION 4 GIVES

• SECURITY OF SUPPLY/ NETWORK RESILIENCE
• INCREASE IN WATER QUALITY
• CAPACITY FOR GROWTH
• BENEFITS BOTH ARWS AND AMBERLEY NETWORKS

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Risks

Operational Lack of above ground storage. Political Ongoing negotiation between Amberley and Ashley water systems could prevent any of the options proceeding (i.e. risk of doing nothing)

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Lessons learned

• Best engineering solution not always best for situation
• Water schemes managed by committees
• Differences in system and operation - UK predominately fed by gravity

systems

• Question

Is a committee led water scheme the best form of management, and if so how could this be improved?

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Thank You QUESTIONS ?

Bryn.larsen@aecom.com