Works to the existing reservoir including the following: 1. Raising of the existing dam. 2. Construction of an auxiliary spillway 3. Construction of a new outlet chamber with low-level side weirs and low-level penstock 4. Extension of the existing discharge point to move further downstream away from the toe of the embankment and the construction of a new headwall. 5. Removal of high-level overflow pipe. 6. Minor improvements to the existing spillway entrance to realign the inlet wingwall. 7. Lowering of the intermediate weir on the main spillway.