Figure 4 . It is important to reiterate that these estimates do not include full Program and Activity Area costs .
Some of the cost-effectiveness results highlight some differences between projects which cannot be easily explained . In particular , several cost-effectiveness results from grazing support projects were considered to be comparatively high due to achievement of 1 tonne or less sediment reduction per project , including BBB17-102 , BBB17-103 and BBB17-418 ($ 1,849 / tonne up to $ 8,875 / tonne ). The projects that generated very low sediment reductions were reported as >$ 600 / tonne and are not shown in Figure 4 . One project , BBB17- 431 , was comparatively low ($ 0.43 / tonne ) and reported as incorrect ( some paddock scale project invoices had not yet been received by the LDC Project at the time the cost effectiveness budgets needed to be submitted and so the cost data was not accurate ). These results are not included in the summary below or in the graphical representation of the results in Figure 4 .
The cost-effectiveness of the Grazier Support projects ( identified in the ‘ Type ’ column in Table 4 as Erosion Control , GLM Wire & Water , Revegetation or Grader Project ) ranged from $ 2.20 / tonne of fine sediment saved ( a Grader Project ) up to $ 223 / tonne of fine sediment saved ( GLM Wire and Water project ), with an average of $ 27 / tonne .
Grader Projects were consistently the most cost-effective , with 22 of the 25 projects reported with a costeffectiveness estimate less than $ 40 / tonne of fine sediment , and 10 being estimated at less than $ 10 / tonne . Whilst these are among the most cost-effective projects , the sediment savings for each ( particularly per unit area ) are lower on average than other on ground projects and are unlikely to produce sufficient sediment reductions to reach the water quality targets in the relatively short time frame required ( i . e ., less than 5 years ). Thus , a mix of options will continue to be explored further into the future , considering the scale of implementation .
The cost-effectiveness of the 19 completed gully remediation project sites aggregated across all sizes and scales ranged from $ 8.10 / tonne of fine sediment saved to $ 370 / tonne of fine sediment saved . The average for these sites was $ 120 / tonne of fine sediment . The cost-effectiveness of 7 projects was less than $ 50 / tonne , and more than two thirds were less than $ 130 / tonne . For context , the cost-effectiveness of the
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