Storm King Dam originally built in 1954 is a concrete gravity dam with an ogee crest which has a catchment of approximately 94km2. Being situated approximately 8km south-east of Stanthorpe it is supplied by Quart Pot Creek.
As part of safety improvement works to the dam wall in 2012, 15No. post tension rock anchors consisting of 4 strand anchors were installed along the crest of the spillway.
During dam lift off testing in 2021 it was found that the anchors had significant deficiencies in load when compared to the original design requirement, and losses in excess of 10% had occurred during this period.
Fortec was engaged to perform new Lift-off testing to determine current anchor loads, and if the lift off tests showed they were below the design requirement, reloading of the anchors back to design %MBL was required.
This was done using shim plates to ensure the load was achieved. New lift-off tests were performed to confirm load compliance above 64%MBL.
