PowerPoint Presentation Office 2010
WSUD - Raingardens with Infrastructure Upgrades
IPWEA NSW 2014 Works Conference May 2014
Iraj Shrestha Graduate Project Engineer City Infrastructure & Traffic Operations City Operations Division City of Sydney
City Of Sydney •
26
2 km
25% of NSW GDP 8% of National GDP 200,000 businesses 390,000 workers
1M visitors a day 4M tourists a year
Sydney 2030 Vision The T he S Sustainable ustai staiinab ble e Sydney Sy ydney 2030 203 30 vision vision for fo or a worldworldlleading ead diing g metropolis me etrop pollliis is requires requir requi ires the h City Ciity to C to respond resp pond to to changes are tthe he ch he hang nge ges that that a re e occurring occu o ccurrri ring ing through h h iits ts growth. growth. The overarching T Th he h eo verarchin hing themes them h mes for fo for Sydney S d y 2030 203 030 are: arre: • • • • •
An n inte integrated egra egra ated inner inne er Sydney Syd dneyy transport transsporrt network ne etwo ork A liveable livea ab ble le e green gree gree en network ne networ etworrk Activity Ac ctiv tivity ty hubs hubs ass the the focus th focus cus for for the the City’s City’s village villa illa age ge communities comm com mmunities ities and an nd transport trran nsport Transform nsfform mative tive e dev d evelo lo op pmen nt and and Transformative development susta staina inable ble renewal renewa ren wal sustainable A revitalised reviitalise talise ed city ciity centre cen ntre e at at the e heart heart of of a global globall Sydney Syd d n ey
We have committed to reducing emissions by
70%
““By By 2 2030, 030, 30 0 the the City Cityy will will reduce wi reduce e greenhouse greenhou use gas gas emissions e missions byy 50% 50 50 0% % compared compa ared red to to 1990 199 90 levels, levells, and an a nd b y 70% 70% ccompared ompared tto o1 990 0 llevels eve els by by 2050.” 2050.” 20 by 1990
3
Sydney’s 2030 Vision •
The Sustainable Sydney 2030 vision for a worldleading metropolis requires the City to respond to the changes that are occurring through its growth. The overarching themes for Sydney 2030 are: • • • • •
An integrated inner Sydney transport network A liveable green network Activity hubs as the focus for the City’s village communities and transport Transformative development and sustainable renewal A revitalised city centre at the heart of a global Sydney
“By 2030, the City will reduce the whole City’s mains water consumption by 10% of 2006 levels..”
We will also reduce sediments and suspended solids by 50% and nutrients by 15% which are discharged into the waterways
Raingarden Deployment • Since 2008 the City has constructed 106 raingardens • Covering over 2300 m2 • Multiple benefits such as water quality improvement, increased greenery, traffic calming and increased amenity
TYPICAL RAINGARDEN DESIGN
Raingardens – Lining Materials Polypropylene
Shotcrete
Raingarden Size & Depth Limitations • Limited locations in highly urbanised areas • Competing priorities such as removing parking or encroaching on to footway • Generally located in kerb extensions in no stopping zones
Raingarden Size & Depth General Dimensions • Ideal water ponding depth 150 – 200 mm • Maximum ponding depth 300 mm • Minimum size 6 m2, Average size 20 m2
Raingardens – Poor Outcomes • Small, narrow and shallow raingardens are prone to problems
Raingardens – Impacts of Trees • • • • •
Incorporating existing trees into unlined systems Damage to tree during construction Damage to liner Shading effects Leaf litter
Raingardens – Selecting the Type • Knowledge of the soil & ground water characteristics of the local environment • Unlined where practical
Raingardens – Layer Tolerances • • • • •
Attention to detail Layer thickness control Educating staff and contractors Use experienced consultants to build knowledge and skills Do not overfill
Raingardens – Water Entry Points • • • •
Erosion control Silt and debris build up at entrance Multiple dissipation arrangements trialled Drop water in to raingarden
Raingardens – Water Entry Points • • • •
Stop silt and debris entering vegetated area New entry pit designed and trialled Reduced maintenance Improved visual appearance
Raingardens – Plant Selection • • • •
Highly visible in urban environment Use larger plants and dense planting Instant green impact Cost effective
Raingardens – Plant Selection • Adjust planting scheme to suit community expectations • Structured or unstructured
Raingardens – Recycled Materials • Recycled glass in transition layer and pipe backfill • Green Star concrete in construction works
Raingardens – Performance Monitoring
IPWEA NSW 2014 Works Conference May 2014
Iraj Shrestha Graduate Project Engineer City Infrastructure & Traffic Operations City Operations Division City of Sydney
City Of Sydney •
26
2 km
25% of NSW GDP 8% of National GDP 200,000 businesses 390,000 workers
1M visitors a day 4M tourists a year
Sydney 2030 Vision The T he S Sustainable ustai staiinab ble e Sydney Sy ydney 2030 203 30 vision vision for fo or a worldworldlleading ead diing g metropolis me etrop pollliis is requires requir requi ires the h City Ciity to C to respond resp pond to to changes are tthe he ch he hang nge ges that that a re e occurring occu o ccurrri ring ing through h h iits ts growth. growth. The overarching T Th he h eo verarchin hing themes them h mes for fo for Sydney S d y 2030 203 030 are: arre: • • • • •
An n inte integrated egra egra ated inner inne er Sydney Syd dneyy transport transsporrt network ne etwo ork A liveable livea ab ble le e green gree gree en network ne networ etworrk Activity Ac ctiv tivity ty hubs hubs ass the the focus th focus cus for for the the City’s City’s village villa illa age ge communities comm com mmunities ities and an nd transport trran nsport Transform nsfform mative tive e dev d evelo lo op pmen nt and and Transformative development susta staina inable ble renewal renewa ren wal sustainable A revitalised reviitalise talise ed city ciity centre cen ntre e at at the e heart heart of of a global globall Sydney Syd d n ey
We have committed to reducing emissions by
70%
““By By 2 2030, 030, 30 0 the the City Cityy will will reduce wi reduce e greenhouse greenhou use gas gas emissions e missions byy 50% 50 50 0% % compared compa ared red to to 1990 199 90 levels, levells, and an a nd b y 70% 70% ccompared ompared tto o1 990 0 llevels eve els by by 2050.” 2050.” 20 by 1990
3
Sydney’s 2030 Vision •
The Sustainable Sydney 2030 vision for a worldleading metropolis requires the City to respond to the changes that are occurring through its growth. The overarching themes for Sydney 2030 are: • • • • •
An integrated inner Sydney transport network A liveable green network Activity hubs as the focus for the City’s village communities and transport Transformative development and sustainable renewal A revitalised city centre at the heart of a global Sydney
“By 2030, the City will reduce the whole City’s mains water consumption by 10% of 2006 levels..”
We will also reduce sediments and suspended solids by 50% and nutrients by 15% which are discharged into the waterways
Raingarden Deployment • Since 2008 the City has constructed 106 raingardens • Covering over 2300 m2 • Multiple benefits such as water quality improvement, increased greenery, traffic calming and increased amenity
TYPICAL RAINGARDEN DESIGN
Raingardens – Lining Materials Polypropylene
Shotcrete
Raingarden Size & Depth Limitations • Limited locations in highly urbanised areas • Competing priorities such as removing parking or encroaching on to footway • Generally located in kerb extensions in no stopping zones
Raingarden Size & Depth General Dimensions • Ideal water ponding depth 150 – 200 mm • Maximum ponding depth 300 mm • Minimum size 6 m2, Average size 20 m2
Raingardens – Poor Outcomes • Small, narrow and shallow raingardens are prone to problems
Raingardens – Impacts of Trees • • • • •
Incorporating existing trees into unlined systems Damage to tree during construction Damage to liner Shading effects Leaf litter
Raingardens – Selecting the Type • Knowledge of the soil & ground water characteristics of the local environment • Unlined where practical
Raingardens – Layer Tolerances • • • • •
Attention to detail Layer thickness control Educating staff and contractors Use experienced consultants to build knowledge and skills Do not overfill
Raingardens – Water Entry Points • • • •
Erosion control Silt and debris build up at entrance Multiple dissipation arrangements trialled Drop water in to raingarden
Raingardens – Water Entry Points • • • •
Stop silt and debris entering vegetated area New entry pit designed and trialled Reduced maintenance Improved visual appearance
Raingardens – Plant Selection • • • •
Highly visible in urban environment Use larger plants and dense planting Instant green impact Cost effective
Raingardens – Plant Selection • Adjust planting scheme to suit community expectations • Structured or unstructured
Raingardens – Recycled Materials • Recycled glass in transition layer and pipe backfill • Green Star concrete in construction works
Raingardens – Performance Monitoring
