stormwater recycling: towards water sensitive cities
TRANSCRIPT
STORMWATER RECYCLING:Towards Water Sensitive Cities
Stephen HainsCity of Salisbury, South Australia
The emerging water crisis in southern Australia
Step change in Australian Annual Total Rainfall
1900-2008 1970-2008
Figure 2.13
Lake Alexandrina Water Level and Salinity 2004-2008
-0.40-0.35-0.30-0.25-0.20-0.15-0.10-0.050.000.050.100.150.200.250.300.350.400.450.500.550.600.650.700.750.800.850.900.951.00
30/12/200329/01/200428/02/200429/03/200428/04/200428/05/200427/06/200427/07/200426/08/200425/09/200425/10/200424/11/200424/12/200423/01/200522/02/200524/03/200523/04/200523/05/200522/06/200522/07/200521/08/200520/09/200520/10/200519/11/200519/12/200518/01/200617/02/200619/03/200618/04/200618/05/200617/06/200617/07/200616/08/200615/09/200615/10/200614/11/200614/12/200613/01/200712/02/200714/03/200713/04/200713/05/200712/06/200712/07/200711/08/200710/09/200710/10/20079/11/20079/12/20078/01/20087/02/20088/03/2008
Date
0
500
1000
1500
2000
2500
3000
3500
ECLe
vel
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 cleansingIn 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 LayerNatural
Recharge
Wetland/Basin
Stormwater and/orWastewater
Groundwater Level
SewageSewage
Treatment
Irrigation InjectionWell
Aquifer
Recovery from aquifer in dry seasonStorm/Waste-water to aquifer in wet season
Wet Season
Dry Season
GRAPHICS BY CSIRO LAND & WATER
Aquifer Storage and Recovery (ASR)
Stormwater
Confining LayerNatural
Recharge
Wetland/Basin
Stormwater and/orWastewater
Groundwater Level
SewageSewage
Treatment
Irrigation InjectionWell
Aquifer
Recovery from aquifer in dry seasonStorm/Waste-water to aquifer in wet season
Wet Season
Dry Season
GRAPHICS BY CSIRO LAND & WATER
Aquifer Storage and Recovery (ASR)
Stormwater
Aquifer Storage & Recovery
Bridge Road
Sports Fields
Maxw
ell Ro ad
Recharge Bore
Industrial Applications
Paddocks Wetland
Environmental Benefits
Current Position
53 Wetlands; 16 ASR Bores; Detention damsAdelaide water consumption – 200Gl– 80Gl from Murray; 180Gl in
dry yearStormwater 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 Reserves50%
Residential5%
Education4%
Industry41%
Mawson Lakes
ASR Mixing Tank
Springbank WatersSpringbank Waters
ASR
Water Business Unit
Carries all debt, water asset management and operational expensesPurchases staff time from CouncilReceives all revenueInternal BoardBusiness case prepared for all new investment – Strong positive cash flow within 5 years
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
Mill
ions
08/09 09/10 10/11 11/12 12/13
Financial Year
Gross Revenue Forecasts
URBANADELAIDE
Total Average 216GlTotal 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
NorthernAdelaide 20
Barker 6
Torrens 15
Patawalonga 12
Brighton 5
SouthernAdelaide 22
TOTAL 100
20
20
12
15
12
5
22
106
WaterWise AdelaideScheme Model
WaterWise Adelaide ModelTotal Water Use: 365 Gl
Water SensitiveCity
Water CycleCity
Waterways City
Drained City
SeweredCity
Cumulative Socio-Political Drivers
Service Delivery Functions
Water SupplyCity
Supply hydraulics
Water supply access & security
Drainage, channelisation
Flood protection
Separate sewerage schemes
Public health protection
Evolving Urban Water HydroEvolving Urban Water Hydro--Social ContractSocial Contract
Brown et al (2008).
Point & diffuse source pollution management
Social amenity, environmental protection
Water SensitiveCity
Water CycleCity
Waterways City
Drained City
SeweredCity
Cumulative Socio-Political Drivers
Service Delivery Functions
Water SupplyCity
Supply hydraulics
Water supply access & security
Drainage, channelisation
Flood protection
Separate sewerage schemes
Public health protection
Evolving Urban Water HydroEvolving Urban Water Hydro--Social ContractSocial 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 SensitiveCity
Water CycleCity
Waterways City
Drained City
SeweredCity
Cumulative Socio-Political Drivers
Service Delivery Functions
Water SupplyCity
Supply hydraulics
Water supply access & security
Drainage, channelisation
Flood protection
Separate sewerage schemes
Public health protection
Evolving Urban Water HydroEvolving Urban Water Hydro--Social ContractSocial 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