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Table 3

The water quality and economic benefit of urban canopy cover based on current levels as well as under future expansion scenarios

Annual runoffAvoided annual runoff
Annual N-loadAvoided annual N-loadAvoided capital cost
Scenario(ML)(ML)(mm)(kg)(kg)($AUD*103)
No trees 447 – – 934 (706–1,229) – – 
Current canopy 408 39 13 853 (645–1,122) 81 (61–107) 586 (441–774) 
Canopy expansion all evergreen trees 335 112 37 701 (530–922) 233 (176–307) 1,686 (1,274–2,222) 
Canopy expansion all deciduous trees 374 73 24 781 (591–1,028) 152 (115–201) 1,100 (832–1,455) 
Canopy expansion an equal mix of deciduous and evergreen trees 355 92 30 741 (560–975) 193 (146–254) 1,397 (1,057–1,838) 
Annual runoffAvoided annual runoff
Annual N-loadAvoided annual N-loadAvoided capital cost
Scenario(ML)(ML)(mm)(kg)(kg)($AUD*103)
No trees 447 – – 934 (706–1,229) – – 
Current canopy 408 39 13 853 (645–1,122) 81 (61–107) 586 (441–774) 
Canopy expansion all evergreen trees 335 112 37 701 (530–922) 233 (176–307) 1,686 (1,274–2,222) 
Canopy expansion all deciduous trees 374 73 24 781 (591–1,028) 152 (115–201) 1,100 (832–1,455) 
Canopy expansion an equal mix of deciduous and evergreen trees 355 92 30 741 (560–975) 193 (146–254) 1,397 (1,057–1,838) 
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