Figure 1 . Summary of the Program Logic for the LDC Project . .......................................................................... 14 Figure 2 . Illustration of the monitoring , modelling and reporting components that form the basis for the overall LDC Monitoring and Evaluation Strategy . ............................................................................................. 15 Figure 3 . Total fine sediment reduction by project type and erosion source . Inset shows the proportion of the total project area for each project type 2019 - 2021 . ....................................................................................... 22 Figure 4 . Results of the cost-effectiveness metric presented for each project type 2018 – 2021 presented in Table 4 . Note that the results <$ 1.00 / tonne and >$ 600 / tonne are excluded from this figure . ....................... 34 Figure 5 . Predicted fine sediment reductions for all projects completed in the LDC Project 2019 , 2020 and 2021 ( as at June 2021 ) in the Bowen Broken Bogie sub-catchments ( generated by Alluvium , 2021 ). ............ 43 Figure 6 . Map showing the average suspended sediment concentration for each of the community water quality monitoring sites ( 2018-2021 ). ............................................................................................................... 47 Figure 7 . Graph showing the full range of SS concentrations measured at each sampling site for all three wet seasons ( 2018-2021 ). Average site concentrations are shown in blue text . Number of samples collected at each sample represented as n below each boxplot . ............................................ 48 Figure 8 . Map showing the average particulate nitrogen concentration for each of the community water quality monitoring sites ( 2018-2021 ). ............................................................................................................... 49 Figure 9 . Map showing the average particulate phosphorus concentration for each of the community water quality monitoring sites ( 2018-2021 ). ............................................................................................................... 50 Figure 10 . Image of the site showing the areas of Phase 1 works at Mt Wickham . Image taken in February 2019 following a rainfall event ( photo credit : Damon Telfer ). Source : NQ Dry Tropics . .................................. 51 Figure 11 . Photographs showing A ) Gully 1a before and B ) Gully 1a after , C ) Gully 10 before and D ) Gully 10 after the Phase 1 works . Source : NQ Dry Tropics . ............................................................................................ 52 Figure 12 . Location of the Mt Wickham Treatment and Control gullies . The location of the treatment structures and monitoring equipment / locations are shown . Source : Bartley et al . ( 2020 ). ............................ 53 Figure 13 . Mt Wickham Control gully ( A ) before ( B ) during an event in Jan 2020 and ( C ) Dec 2020 . Mt Wickham Treatment gully ( D ) before ( E ) during and event in Jan 2020 and ( F ) Jan 2021 . ............................... 54 Figure 14 . Mt Wickham hillslope above ( A ) control gully in 2018 and ( B ) the treatment gully in 2018 and ( C ) control gully in April 2021 and ( D ) treatment gully in April 2021 . .................................................................... 55 Figure 15 . Mt Wickham Control and Treatment results for ( A ) Rainfall ( B ) runoff ( C ) Total Suspended Sediment ( TSS ) loads ( t / y ), and ( D ) TSS in t / ha and ( E ) Total Nitrogen ( TN ) loads ( kg / y ) and ( F ) TN in kg / ha . 58 Figure 16 . Mt Wickham TSS data before and after rehabilitation works ( treatment ).. .................................... 59 Figure 17 . ( A ) comparison of TSS data from all un-treated gullies for all years of data ( B ) comparison of TN data from all un-treated gullies for all TN data at each site ( 2016-17 to 2020-21 ). ......................................... 59 Figure 18 . Particle size of suspended sediment collected at each site over the entire study period . Note that sediment < 20 µ m ( dotted line ) is considered to be the most ecologically detrimental for the GBR ( Bainbridge et al ., 2018 ). ....................................................................................................................................................... 60 Figure 19 : Before and after images of the Glen Bowen Treatment gully ( Image source : NQ Dry Tropics ). ..... 61 Figure 20 . Location of the Glen Bowen Treatment and Control gullies . The location of the treatment structures and monitoring equipment / locations are shown . Source : Bartley et al . ( 2021 ). ............................ 63 Figure 21 : Glen Bowen hillslope above ( A ) control gully and ( B ) the treatment gully at the end of the 2020-21 wet season . ........................................................................................................................................................ 63 Figure 22 : Glen Bowen water quality monitoring station set up ( A , D ). The instrumentation setup is the same at both treatment and control sites ( B ) the control site sensor cluster on the bed of the gully and ( C ) the control site sensors during an event that was just above the event threshold for sample collection . ( E ) The treatment gully sensor during an event on 7 January 2021 and ( F ) an event at the control site on the same date in Jan 2021 . ................................................................................................................................................ 64 Figure 23 . ( A ) TSS concentration and ( B ) TN concentrations at Glen Bowen for the 2019 / 20 wet season . No samples were collected the treatment site in 2019-20 or 2020-21 . ................................................................. 65
5