ADELAIDE DARWIN MELBOURNE PERTH WHYALLA Page 1 Metropolitan Local Government Group Recycled Water Scheme For Metropolitan.

ADELAIDE DARWIN MELBOURNE PERTH WHYALLA

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Metropolitan Local Government Group

Recycled Water Scheme For Metropolitan Adelaide

Opportunities and Constraints

Presented by Nathan Silby

ADELAIDE DARWIN MELBOURNE PERTH WHYALLA

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Recycled Stormwater

• Harvest Volumeso Current – 8 GL/annumo Committed – 13 GL/annumo Proposed – 10 GL/annumUSHOS 6.2, 11.6, 8.8 – 26.6 GL/a

• “Water For Good” targeted capture and harvest of 35 GL/annum by 2025

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Sewage

• 85 GL/annum currently produced in the greater Adelaide area.

• Approximately 25 GL/annum is reused.

• Storage requirement 40 GL (Hope Valley + Happy Valley 14 GL)

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Recycled Stormwater v’s Treated Effluent

• Combined potential yield ≈ 140 GL/annum

• 75% of Adelaide's current mains water supply, (≈ 180 GL/a) & 40% of the predicted 2050 supply (≈360 GL/a) .

• Demand for non-potable water less than potential supply – prioritisation of treated wastewater v's stormwater required. (Council irrigation Demand 5 GL/a)

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Distribution Networks

• A number of constructed, committed & proposed networks across metro Adelaide.

• Connection between networks to provide reliability of supply across council boundaries.

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Network Connection Possible Route Connector

Length

Costs

Adelaide Airport – Charles

Sturt Connection

Trimmer Parade 5km $2.1m

Adelaide Airport - GAP Routes to run

parallel in

sections

minimal $0.2m

Barker Inlet – Charles Sturt

Connection

First Avenue &

Coker Street

1km $0.4m

GAP – Eastern Region

Connection

Walkerville

Terrace &

Stephen Terrace

1.5km $0.7m

GAP – Unley Connection Hutt Rd &

George Street

N/A Under tender

Salisbury – Playford

Connection

Bellchambers

Rd & West

Avenue

2km $0.9m

Salisbury – Tea Tree Gully

Connection

Barina Avenue

& Alexander

Avenue

1.5km $0.3m

Salisbury / Playford and

Virginia

Curtis Road 2.5km $1.1m

North-South Connection Extensive route

requiring further

investigation

20-30km $15m

Indicative Network Connection Costs

ADELAIDE DARWIN MELBOURNE PERTH WHYALLA

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Pricing

• SA Water 75% Tier 2 – ($1.86)(Current mains water price $2.48)

Bolivar <$0.15 slidingGlenelg $0.23 to $0.44

• Salisbury / TTG / PlayfordUsage $2.20

Supply $50/annumBulk Transfer $1.60

ADELAIDE DARWIN MELBOURNE PERTH WHYALLA

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Issues Moving Forward

• Mixing recycled stormwater & treated effluent (ASR, benefits)

• Prioritisation of source• Pricing (data, competition, restriction v

price)• Detailed demand study to quantify likely

demand for reuse water• Control of carp in treatment wetlands

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Issues Moving Forward

• Assessment of the tertiary aquifers capacity to store expected volumes of stormwater.

• Use of treated stormwater as a source of potable water.

• Interconnection between council networks (operation, liability, benefits)

• Funding