Table 4 . Summary of the treatment history and water quality outcomes measured in the LDC Project to date . The colour of the boxes indicates the degree of measured improvement at treatment site compared to control for each measure with green indicating an improvement , red indicating a decline and orange indicating no significant effect to date . * Represents early indicator , pending further data and is coloured in grey , NA = not available . Source : Bartley et al . ( 2021 ).
Site summary and description of treatment
Measured improvement at treatment site compared to control .
|
Strathbogie |
Mt Wickham |
Glen Bowen |
Mt Pleasant |
Havilah |
Burdekin basin |
Bogie |
Bowen |
Bowen |
Bogie |
Bowen |
Managing organisation |
NQDT ( J . Day ) |
NQDT ( Verterra ) |
NQDT ( Neilly Group ) |
NQDT ( Mulloon Institute ) |
NQDT ( Alluvium ) |
Gully type |
Linear hillslope gullies |
Scalds and major alluvial gullies |
Scalds and major alluvial gullies |
Linear hillslope gullies and scalds |
Scalds and major alluvial gullies |
Average annual long-term rainfall ( mm ) from nearest BOM site |
~ 750 mm |
~ 600 mm |
~ 725 mm |
~ 690 mm |
~ 590 mm |
Soil type Black Vertosol Hypernatric Brown Sodosol Brown or Yellow Sodosols
Catchment area ( ha ) above monitoring station at treatment site
Primary treatment
Grazing management in treatment paddock
Black and Brown Chromosols and Brown Sodosols .
Vertosols to south of gullies and Chromosols to north .
41 ha 14 ha 2.7 ha 259 ha 220 ha
- Five hillslope flow diversion banks with two drains - Fencing - Small rock revetment near headcut
Planned ( and unplanned ) grazing management in place -4- 5 months .
- Major earth works , soil treatment , rock chute structures - Fencing - Significant re-veg using mixed exotic species
160-180 weaners in treatment and control for 2- 3 weeks .
- Major earth works , soil treatment , rock chute structures + earth bund , water points - Fencing - Significant re-veg using mixed exotic species
Planned grazing management in place -various cattle numbers and time periods
- Landscape rehydration
- Four v-notch log rock sill structures and an earth bank to divert flows - Fencing and trough
Exclusion for limited periods and then rotational grazing .
Flow diversion and rock chutes to be installed in 2021
Combination of continuous grazing and spelling
Year control site monitoring began |
2016 |
2018 |
2019 |
2019 |
2020 |
Year treatment was initiated |
2019 |
Early 2019 |
Late 2019 |
Late 2019 |
2021 |
Year treatment site monitoring began |
2016 |
Early 2019 |
Late 2019 |
Late 2019 |
2020 |
No . years treatment in place |
1 |
2.5 |
1 |
1 |
0 |
No . years of control / treatment monitoring |
4 |
3 |
1 |
1 |
1 |
Total cost ($) of on-ground works |
~$ 44k |
$ 595k |
~$ 840k |
$ 95k |
~$ 230K |
Land condition |
Maintained , slight↑ |
Improved |
Improved |
Improved |
NA |
Vegetation ( hillslope + gully ) |
No significant effect |
Improved |
Improved |
Maintained |
NA |
Sediment concentrations |
Maintained |
Improved |
NA |
No significant effect |
NA |
Sediment loads Maintained Improved NA No significant effect NA
Treatment effectiveness value ( as of 2020 / 21 )
0.5 0.91 - - -
36