Landcom Book 4 Maintenance - WSUD

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Water Sensitive Urban Design $18,000 $16,000 $14,000 $12,000 Bioretention basin sized to remove 45 percent of TN pollutant loads generated from a 1 hectare, 100 percent impervious catchment (road) Annualised cost of system in terms of pollutant load reductions are: / $70 per kg TN removed / $320 per kg TP removed / $1 per kg TSS removed Cost ($) $10,000 $8,000 Decomissioning Cost Renewal Cost Maintenance Cost Capital Cost $6,000 $4,000 $2,000 $- 1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 41 43 45 47 49 Time (years) Figure 1: LCC for bioretention basins $140,000.00 $120,000.00 $100,000.00 Constructed wetland sized to remove 45 percent of TN pollutant loads generated from a 1 hectare, 100 percent impervious catchment (road) Annualised cost of system in terms of pollutant load reductions are: / $440 per kg TN removed / $2300 per kg TP removed / $3 per kg TSS removed Cost ($) $80,000.00 $60,000.00 Decomissioning Cost Renewal Cost Maintenance Cost Capital Cost $40,000.00 $20,000.00 $- 1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 41 43 45 47 49 Time (years) Figure 2: LCC for constructed wetlands 16 Book 4 | MAINTENANCE
Water Sensitive Urban Design $6,000.00 $5,000.00 $4,000.00 Sediment basin sized to remove 80 percent of course sediment (defined as particles greater than 125 microns) for a 1 hectare, 100 percent impervious catchment (road) Annualised cost of system in terms of pollutant load reductions are: / $500 per kg TN removed / $800 per kg TP removed / $1 per kg TSS removed Cost ($) $3,000.00 $2,000.00 Decomissioning Cost Renewal Cost Maintenance Cost Capital Cost $1,000.00 $- 1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 41 43 45 47 49 Time (years) Figure 3: LCC for sedimentation basins 4.2 How does the LCC of WSUD development compare with that of conventional drainage infrastructure The life cycle costs of water sensitive urban design measures were assessed by Lloyd et al. (2002) for one of the original WSUD strategies implemented in Victoria (that is, Lynbrook Estate). The assessment considered three stormwater management scenarios: Conventional Approach: Downstream Stormwater Treatment: Distributed Stormwater Treatment: Stormwater is piped to the downstream waterway. No treatment of stormwater is considered. An end-of-pipe treatment system is employed to ensure the quality of discharged stormwater meets best management practice (BMP) objectives for pollutant load reductions. A series of WSUD elements are employed to remove pollutants at source, such that a greater volume of stormwater can be treated to BMP objectives. The assessment found the capital cost of a distributed system to be 22 percent greater than the conventional approach, while a downstream stormwater treatment cost an additional 47 percent. It should be noted that the cost of drainage infrustructure represents approximately 10% of the total cost of development. The range of annualised maintenance cost from the study was reported as: Approach Annualised Maintenance Cost Annualised Maintenance Cost per hectare Conventional Approach: $737 to $1,672 $27 to $62 Downstream Stormwater Treatment: $2,336 to $6,371 $87 to $236 Distributed Stormwater Treatment: $1,723 to $6,512 $64 to $241 Book 4 | MAINTENANCE 17
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Level 2, 330 Church Street Parramat
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Landcom Book 4 Maintenance - WSUD

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