A flow of approximately 50 L/s was observed, when the bellmouths were closed, indicating a leak had developed within the HLDC. To protect mining operations in Pits C and D of the Curragh Coal Mine, Blackwater Creek low flows and floodwaters needed to be diverted and a protection levee constructed.
PSM was engaged to propose solutions that would enable permanent sealing (grouting). These could not be achieved without halting or reducing water flow from Blackwater Creek.
A catchment area greater than 700 km² and a seasonal (cyclonic) rainfall coupled with limited hydrological records were key challenges that required careful evaluation in line with the client’s risk profile.
Engineering and technical challenges included:
PSM’s tailored approach included:
Low flows and floodwaters were successfully diverted with dragline access on a road along the pit-side of the levee together with LV access along the bund crest.
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