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6.4 Cooma Back Creek Management Unit 6.4.1 Site 9 Issue: Gully Bank Erosion Location: E 0692355 N 5994985 Waterway: Bunyan Gully Management Unit: Cooma Back Creek

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6.4 Cooma Back Creek Management Unit 6.4.1 Site 9 Issue: Gully Bank Erosion Location: E 0692355 N 5994985 Waterway: Bunyan Gully Management Unit: Cooma Back Creek 6.4 Cooma Back Creek Management Unit 6.4.1 Site 9 Issue: Gully bank erosion Location: E 0692355 N 5994985 Waterway: Bunyan Gully Management Unit: Cooma Back Creek Bank erosion along gully Debris build-up within gully Condition Assessment: This Bunyan tributary gully is steep in nature and susceptible to further erosion. Active incision and headward extension is apparent. This site has been assessed as having low connectivity for fine sediments due to long travel distance to Murrumbidgee water extraction point with opportunities for storage along channel margins and across floodplain storages. Risk Assessment: Likelihood Consequence Trajectory Risk 2 3 2 12 Risk Rating: Low Management Option: Undertake grade control via the construction of a rock chute. Stabilise the remainder of the site with minor battering coupled with revegetation. 98 6.4.2 Site 10 Issue: Sediment transport Location: E 0693252 N 5994199 Waterway: Bunyan gully (deposition) Management Unit: Cooma Back Creek Sediment deposition along lower reach of gully Sediment deposition Condition Assessment: This site is located at the intersection of the gully documented in Site 8 and Bunyan Creek. Coarse sediments are being deposited at the bottom of gully, with expected high connectivity of fine material to connecting creek. Suggested that aim of stabilisation works should be to encourage deposition of sediments across floodplain. This site has been assessed as having a low connectivity for fine sediments due to long travel distance to Murrumbidgee water extraction point with opportunities for storage along channel margins and across floodplain storages. Risk Assessment: Likelihood Consequence Trajectory Risk 2 3 3 18 Risk Rating: Moderate Management Option: Undertake sediment extraction to increase channel capacity. Follow up with fencing and revegetation of the riparian zone to encourage channel definition. 99 6.4.3 Site 11 Issue: Bank and gully erosion Location: E 0689950 N 5986127 Waterway: Cooma Back Creek Management Unit: Cooma Back Creek Cooma Back Creek immediately upstream of Snowy Cooma Back Creek immediately upstream of Snowy Mountains Hwy Mountains Hwy Gully erosion along Cooma Back Creek Bligh St Facing down the gully to the waterway crossing Gully erosion along Bligh St viewed from opposing bank Upper section of the localised gully erosion Condition Assessment: Localised bank erosion is present along Cooma Back Creek upstream of Cooma. This site has been assessed as having low connectivity for fine sediments due to long travel distance to Murrumbidgee water extraction point with opportunities for storage along channel margins and across floodplain storages. Additionally, gully erosion is present along Bligh Street connecting directly to creek. It has been assessed as having low connectivity for fine sediments due to long travel distance to Murrumbidgee water extraction point with opportunities for storage along channel margins and across floodplain storages. 100 Risk Assessment: Likelihood Consequence Trajectory Risk 2 3 4 24 Risk Rating: Moderate Management Option: Install rock beaching to stabilise eroding banks. Construct rock chutes to stabilise gully erosion. Undertake works to improve road drainage. 101 6.4.4 Site 12 Issue: Bank erosion Location: E 0690396 N 5988308 Waterway: Cooma Back Creek Management Unit: Cooma Back Creek Cooma Back Creek facing upstream Back erosion along Cooma Back Creek Condition Assessment: Banks along this section of Cooma Back Creek are 3m high with localised bank erosion present. This creek has been assessed as having low connectivity for fine sediments due to long travel distance to Murrumbidgee water extraction point with opportunities for storage along channel margins and across floodplain storages. Risk Assessment: Likelihood Consequence Trajectory Risk 2 2 3 12 Risk Rating: Low Management Option: Localised rock beaching to manage bank erosion. Fencing and revegetation of site recommended in consultation with landholder. 102 6.4.5 Site 13 Issue: Bank erosion Location: E 691279 N 5983884 Waterway: Cooma Back Creek Management Unit: Cooma Back Creek Erosion of outside bend Willow blockage on neck cutoff Condition Assessment: This site is located on an outside bend of Back Cooma Creek adjacent to Myalla Road. The majority of flow now passes through a neck cutoff held by a willow blockage. The outside bend flows in higher flow events and has some active bank erosion present. This could be stabilised by removing the willow blockage and installing native large woody debris, localised toe rock beaching coupled with fencing and revegetation would be installed on the outside bend. Risk Assessment: Likelihood Consequence Trajectory Risk 2 3 3 18 Risk Rating: Moderate Management Option: Remove in-stream willow blockage. Complete rock beaching at toe of bank to manage bank erosion. Fencing and revegetation of site in consultation with landholder. 103 6.4.6 Site 14 Issue: Bank erosion Location: E 691283 N 5983890 Waterway: Cooma Back Creek Management Unit: Cooma Back Creek Eroding outside bend Side gully entry point Condition Assessment: This is an eroding bank approximately 3m in height. The bank could be stabilised with toe rock beaching. An additional side gully enters the site and may require stabilisation with a rock chute. Risk Assessment: Likelihood Consequence Trajectory Risk 2 3 3 18 Risk Rating: Moderate Management Option: Rock beaching of eroding bank. Fencing and revegetation of site in consultation with landholder. 104 6.4.7 Site 15 Issue: Bed and bank erosion Location: E 0691685 N 5985643 Waterway: Cooma Creek Management Unit: Cooma Back Creek Localised bank erosion along Cooma Creek Condition Assessment: This site along Cooma Creek upstream of Cooma has undergone localised bank erosion. It has been assessed as having low connectivity for fine sediments due to long travel distance to Murrumbidgee water extraction point with opportunities for storage along channel margins and across floodplain storages. Risk Assessment: Likelihood Consequence Trajectory Risk 2 2 3 12 Risk Rating: Low Management Option: No structural works recommended. Fencing and revegetation of site recommended in consultation with the landholder. 105 6.4.8 Site 16 Issue: Urban water quality Location: E 0691406 N 5987949 Waterway: Cooma Back Creek Management Unit: Cooma Back Creek Cooma Creek Condition Assessment: The banks along this section of Cooma Back Creek are relatively stable due to their shallow sloped nature. It has been assessed as having low connectivity for fine sediments due to long travel distance to Murrumbidgee water extraction point with opportunities for storage along channel margins and across floodplain storages. Risk Assessment: Likelihood Consequence Trajectory Risk 2 2 2 8 Risk Rating: Low Management Option: Efficacy of gross pollutant traps to be investigated to mitigate impact of urban drainage on waterway. Revegetation with appropriate native species should be considered. 106 6.4.9 Site 17 Issue: Bank erosion Location: E 0693753 N 5994443 Waterway: Cooma Creek Management Unit: Cooma Back Creek Cooma Creek upstream of Monaro Hwy Cooma Creek downstream of Monaro Hwy Condition Assessment: The banks along Cooma Creek at this site are stable and highly vegetated. Assessed as having low connectivity for fine sediments due to long travel distance to Murrumbidgee water extraction point with opportunities for storage along channel margins and across floodplain storages. Risk Assessment: Likelihood Consequence Trajectory Risk 2 2 2 8 Risk Rating: Low Management Option: No structural works recommended. Fencing and revegetation of site recommended in consultation with the landholder. 107 6.4.10 Site 18 Issue: Bank erosion Location: E 0696967 N 6001721 Waterway: Lower Cooma Creek Management Unit: Cooma Back Creek A view of lower Cooma Creek (foreground) and Facing upstream of Cooma Creek Numeralla River (background) Condition Assessment: This site is located just upstream of the Numeralla and Lower Cooma Creek Confluence. The bottom reach of this creek has eroding banks and is likely to be a significant source of fine sediments to the Numeralla River. This site has been assessed as having high connectivity for fine sediments due to direct input of fine sediments from channel banks into stream flow. Risk Assessment: Likelihood Consequence Trajectory Risk 4 4 3 48 Risk Rating: Very high Management Option: Rock beaching of eroding Creek banks. Fencing and revegetation in consultation with landholder. 108 6.5 Gudgenby River Management Unit 6.5.1 Site 19 Issue: Bed and bank erosion Location: E 0688131 N 6066089 Waterway: Gudgenby River Management Unit: Gudgenby River Debris build-up against bridge Overlooking river valley Bank erosion visible along right-hand bank Bank erosion visible along left-hand bank Condition Assessment: There has been recent channel widening and stripping of fine sediments from the channel banks and floodplain. This is likely to be a significant source of fine grained sediment (silt/clay and sand) to the channel. The banks at this location are up to 3m in height. This site is assessed as having a high connectivity for fine sediments; there is a high probability of eroded fine sediments being transported directly to the Murrumbidgee. Risk Assessment: Likelihood Consequence Trajectory Risk 4 4 3 48 Risk Rating: Very High Management Option: Relocation of debris built up against bridge. Stabilisation of river banks with rock beaching. Fencing and revegetation of the site in consultation with the landholder. 109 6.5.2
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