Gully Maintenance, Monitoring — technical report

Table 1. High daily rainfall recordings(> 60mm) to indicate rainfall events that are more likely to have damaged the 24 remediated sites through high runoff.

BOM station

Nearby Projects

Jan

Dec

2020

2021

2022

2023

2024

Jan

Mar

Aug

Nov

Jan

Feb

Oct

Nov

Jan

Dec

Jan

Feb

Nov

Dec

Gatton Vale 18, 19, 20 72 88 79 79

Collinsville

7, 8, 9, 10, 11, 12, 13, 15, 16

126 100 85 73

Strathmore

1, 2, 3, 4, 5, 6, 21, 23

112 70 63 74 67

Mt Pleasant Alert

Strathbogie Alert

14 97 95 64 60 137 75 69 87 62

24, 25 80 188 61 63 133 82

Millaroo 22 80 73 80 74 75 73 135 79 60

FIRE IMPACTS

One of the sites was affected by fire during the first five years following remediation works. This was a small-scale site 25 where a small fire burnt the wood that was put in the gully head between 2022 and 2023 monitoring.

SITE CLUSTERS- SCALE, SOIL AND LANDSCAPE POSITION

The 24 sites have been divided into three main groups to enable similar sites to be compared. These three groups are colour coded in Table 2:

Of the 14 small-scale sites that had the gully treated to some degree( Blue in Table 2), 11 were classed as hillslope gullies and the remaining three alluvial gullies. Sodosol, Vertosols and Chromosol are well represented in this group.

The third major group( 5 sites, Green in Table 2) are sites where only the contributing catchment was treated. Two of these sites were in alluvial terraces of low relief while the remaining three were more directly connected to hillslopes. A variety of soil types are represented in this group as described in Table 2.

1. Large-scale sites( yellow rows- 5 sites),

2. Small-scale sites that treated the gully, and the catchment if necessary( blue rows- 14 sites) and,

3. Small-scale sites that treated the catchment only; the active gully was not treated( green rows- 5 rows).

All five of the large-scale sites have Sodosol soils of alluvial origin and are lower in the landscape. Three sites had catchments contributing runoff into the gully.

6 GULLY MAINTENANCE AND MONITORING TECHNICAL REPORT

Gully Maintenance, Monitoring — technical report | Seite 10