Table 4. Cost, estimated fine sediment saved and estimated cost effectiveness for the 24 sites. * data drawn from( NQ Dry Tropics, 2022, 142-145).
Site ID Gully status
Sediment saving
( t / y)*
Implementation cost($)- public investment
Maintenance cost($)- Public investment
Maintenance cost($)- inkind contribution
Total Maintenance costs- Public investment + inkind
GMM Monitoring & reporting cost- Public investment
Total Monitoring & Maintence cost($)
Total cost($)- Implemention + maintenance( public and inkind)
Cost effectiveness($/ t)- Initial
Cost effectiveness($/ t)- Updated
20 yr total cost($)*
Cost effectiveness($/ t)( from 20yr total cost)*
Maintenance costs as % of initial construction cost
1 Mostly stabilized 1498 $ 1,304,790.00 $ 48,231.00 $ 48,231 $ 24,149 $ 72,380 $ 1,353,021 $ 871 $ 903 $ 1,766,534 $ 41 3.7 2 Stabilised 1488 $ 613,584 $ 8,144 $ 2,500 $ 10,644 $ 9,120 $ 19,764 $ 624,228 $ 412 $ 420 $ 2,130,857 $ 49 1.7 3 Stabilised 741 $ 266,746 $ 13,130 $ 1,250 $ 14,380 $ 9,120 $ 23,500 $ 281,126 $ 360 $ 379 $ 1,172,508 $ 54 5.4 4 Mostly stabilized 741 $ 527,089 $ 10,475 $ 1,250 $ 11,725 $ 9,120 $ 20,845 $ 538,814 $ 711 $ 727 $ 1,172,508 $ 54 2.2 5 Partly stabilised 922 $ 257,311.00 $ 25,416.00 $ 25,416 $ 9,899 $ 35,315 $ 282,727 $ 279 $ 307 $ 777,438 $ 29 9.9 7 Mostly stabilised 15 $ 8,223 $ 0 $ 8,223 $ 548 $ 548 $ 24,339 $ 26 0.0 8 Mostly stabilised 52 $ 20,118 $ 500 $ 500 $ 500 $ 20,618 $ 387 $ 397 $ 59,550 $ 32 2.5 9 Partly stabilised 5 $ 17,600 $ 14,014 $ 14,014 $ 14,014 $ 31,614 $ 3,520 $ 6,323 $ 52,096 $ 152 79.6 10 Partly stabilised 26 $ 27,925 $ 12,650 $ 12,650 $ 12,650 $ 40,575 $ 1,074 $ 1,561 $ 82,658 $ 67 45.3 12 Mostly stabilised 9 $ 16,000 $ 9,000 $ 9,000 $ 9,000 $ 25,000 $ 1,778 $ 2,778 56.3 13 Partly stabilised 36 $ 24,000 $ 15,000 $ 15,000 $ 15,000 $ 39,000 $ 667 $ 1,083 62.5 14 Mostly stabilised 27 $ 101,400 $ 30,390 $ 30,390 $ 11,590 $ 41,980 $ 131,790 $ 3,756 $ 4,881 $ 289,192 $ 369 30.0 15 Mostly stabilised 1 $ 5,290 $ 0 $ 5,290 $ 5,290 $ 5,290 $ 15,659 $ 117 0.0 16 Stabilised 8 $ 5,290 $ 0 $ 5,290 $ 661 $ 661 $ 15,659 $ 117 0.0 20 Mostly stabilised 7 $ 14,260 $ 0 $ 14,260 $ 2,037 $ 2,037 $ 42,210 $ 54 0.0 22 Failed to stabilise 138 $ 42,591 $ 21,635 $ 21,635 $ 21,635 $ 64,226 $ 309 $ 465 $ 126,069 $ 31 50.8 23 Stabilised 17 $ 29,402 $ 0 $ 29,402 $ 1,730 $ 1,730 $ 87,030 $ 176 0.0 24 Mostly stabilised 34 $ 42,680 $ 6,017 $ 6,017 $ 6,017 $ 48,697 $ 1,255 $ 1,432 $ 126,333 $ 128 14.1 25 Mostly stabilised 7 $ 9,120 $ 0 $ 9,120 $ 1,303 $ 1,303 $ 26,995 $ 116 0.0
6
21
18
Catchment stabilised, gully not treated
Catchment stabilised, gully not treated
Catchment stabilised, gully not treated
11 $ 31,623 $ 0 $ 31,623 $ 2,875 $ 2,875 $ 93,604 $ 293 0.0
5 $ 10,844 $ 0 $ 10,844 $ 2,169 $ 2,169 $ 32,098 $ 240 0.0
43 $ 19,684 $ 16,400 $ 0 $ 36,084 $ 458 $ 839 $ 58,266 $ 8 83.3
19 Failed to stabilise 31 $ 16,000 $ 0 $ 16,000 $ 516 $ 516 0.0
11
Catchment stabilised, gully not treated
2 $ 7,500 $ 0 $ 7,500 $ 3,750 $ 3,750 0.0
38 GULLY MAINTENANCE AND MONITORING TECHNICAL REPORT