STORMWATER RECYCLING: Towards Water Sensitive Cities Stephen Hains - - PowerPoint PPT Presentation

STORMWATER RECYCLING: Towards Water Sensitive Cities

Stephen Hains City of Salisbury, South Australia

The emerging water crisis in southern Australia

Step change in Australian Annual Total Rainfall

1900-2008 1970-2008

Figure 2 .1 3 Lake Alexandrina Water Level and Salinity 2004-2008

• 0.40
• 0.35
• 0.30
• 0.25
• 0.20
• 0.15
• 0.10
• 0.05

0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.50 0.55 0.60 0.65 0.70 0.75 0.80 0.85 0.90 0.95 1.00 30/12/2003 29/01/2004 28/02/2004 29/03/2004 28/04/2004 28/05/2004 27/06/2004 27/07/2004 26/08/2004 25/09/2004 25/10/2004 24/11/2004 24/12/2004 23/01/2005 22/02/2005 24/03/2005 23/04/2005 23/05/2005 22/06/2005 22/07/2005 21/08/2005 20/09/2005 20/10/2005 19/11/2005 19/12/2005 18/01/2006 17/02/2006 19/03/2006 18/04/2006 18/05/2006 17/06/2006 17/07/2006 16/08/2006 15/09/2006 15/10/2006 14/11/2006 14/12/2006 13/01/2007 12/02/2007 14/03/2007 13/04/2007 13/05/2007 12/06/2007 12/07/2007 11/08/2007 10/09/2007 10/10/2007 9/11/2007 9/12/2007 8/01/2008 7/02/2008 8/03/2008

Date

500 1000 1500 2000 2500 3000 3500 EC Level 5 day avg lake level Surcharge Level Full Supply Level 0.35m AHD 5 day avg EC Levels

The emerging water crisis in southern Australia

Salisbury Landform

Stormwater Detention

Wetlands – Habitat and conservation

The Barker Inlet & the Port River Estuary

Wetlands & water cleansing

In wet season, stormwater is detained in small basins and dams Stormwater is controlled to move slowly through wetlands: This results in reduction of;

• Nutrient loads
• Gross pollutants
• Heavy metals

Confining Layer Natural Recharge

Wetland/Basin Stormwater and/or Wastewater

Groundwater Level

Sewage Sewage Treatment

Irrigation Injection Well

Aquifer

Recovery from aquifer in dry season Storm/Waste-water to aquifer in wet season

W e t S e a s

• n

D r y S e a s

• n

GRAPHICS BY CSIRO LAND & WATER

Aquifer Storage and Recovery (ASR)

Stormwater

Confining Layer Natural Recharge

Wetland/Basin Stormwater and/or Wastewater

Groundwater Level

Sewage Sewage Treatment

Irrigation Injection Well

Aquifer

Recovery from aquifer in dry season Storm/Waste-water to aquifer in wet season

W e t S e a s

• n

D r y S e a s

• n

GRAPHICS BY CSIRO LAND & WATER

Aquifer Storage and Recovery (ASR)

Stormwater

Aquifer Storage & Recovery

Bridge Road Sports Fields M a x w e l l R

• a

d Recharge Bore

Industrial Applications

Paddocks Wetland

Environmental Benefits

Current Position

53 Wetlands; 16 ASR

Bores; Detention dams

Adelaide water

consumption

– 200Gl – 80Gl from Murray; 180Gl in dry year

Stormwater flowing

through Salisbury 33Gl

– Currently capture 5Gl – Selling 1.5Gl – Plan to capture 14Gl within 5 years

Water distribution

Capital Investment

Commonwealth, $20.3m Other, $1.4m Council, $17.2m State, $13.0m

Recycled Water Users

Council Reserves 50% Residential 5% Education 4% Industry 41%

Mawson Lakes

ASR Mixing Tank

Springbank Waters Springbank Waters

ASR

Water Business Unit

Carries all debt, water asset management

and operational expenses

Purchases staff time from Council Receives all revenue Internal Board Business case prepared for all new

investment

– Strong positive cash flow within 5 years

0.5 1 1.5 2 2.5 3 3.5 4 4.5 Millions 08/09 09/10 10/11 11/12 12/13 Financial Year

Gross Revenue Forecasts

URBAN ADELAIDE Total Average 216Gl Total Dry Year 216Gl Adelaide Water Supply 2008

Waterproofing Adelaide – A Thirst for Change

GROUND WATER OPPORTUNITIES

Aquifer Storage Opportunities

SURFACE WATER OPPORTUNITIES

SYSTEM POTENTIAL (GL pa)

Surface Water Opportunities

Gawler 20 Northern Adelaide 20 Barker 6 Torrens 15 Patawalonga 12 Brighton 5 Southern Adelaide 22 TOTAL 100 20 20 12 15 12 5 22 106

WaterWise Adelaide Scheme Model

WaterWise Adelaide Model Total Water Use: 365 Gl

Water Sensitive City Water Cycle City Waterways City Drained City Sewered City

Cumulative Socio-Political Drivers Service Delivery Functions

Water Supply City

Supply hydraulics Water supply access & security Drainage, channelisation Flood protection Separate sewerage schemes Public health protection

Evolving Urban Water Hydro Evolving Urban Water Hydro-

• Social Contract

Social Contract

Brown et al (2008).

Point & diffuse source pollution management Social amenity, environmental protection

Water Sensitive City Water Cycle City Waterways City Drained City Sewered City

Cumulative Socio-Political Drivers Service Delivery Functions

Water Supply City

Supply hydraulics Water supply access & security Drainage, channelisation Flood protection Separate sewerage schemes Public health protection

Evolving Urban Water Hydro Evolving Urban Water Hydro-

• Social Contract

Social Contract

Brown et al (2008).

Point & diffuse source pollution management Social amenity, environmental protection Diverse, fit-for- purpose sources & end-use efficiency, waterway health restoration Limits on natural resources

Water Sensitive City Water Cycle City Waterways City Drained City Sewered City

Cumulative Socio-Political Drivers Service Delivery Functions

Water Supply City

Supply hydraulics Water supply access & security Drainage, channelisation Flood protection Separate sewerage schemes Public health protection

Evolving Urban Water Hydro Evolving Urban Water Hydro-

• Social Contract

Social Contract

Point & diffuse source pollution management Social amenity, environmental protection Diverse, fit-for- purpose sources & end-use efficiency, waterway health restoration Limits on natural resources

Brown et al (2008), and Wong and Brown (2008)

Adaptive, multi- functional infrastructure & urban design reinforcing water sensitive values & behaviours Intergenerational equity, resilience to climate change

Conclusions